1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
|
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>xpath: XML Path Language implementation</title>
<meta name="generator" content="Libxml2 devhelp stylesheet">
<link rel="start" href="index.html" title="libxml2 Reference Manual">
<link rel="up" href="general.html" title="API">
<link rel="stylesheet" href="style.css" type="text/css">
<link rel="chapter" href="general.html" title="API">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table class="navigation" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2"><tr valign="middle">
<td><a accesskey="p" href="libxml2-xmlwriter.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td>
<td><a accesskey="u" href="general.html"><img src="up.png" width="24" height="24" border="0" alt="Up"></a></td>
<td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td>
<td><a accesskey="n" href="libxml2-xpathInternals.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td>
<th width="100%" align="center">libxml2 Reference Manual</th>
</tr></table>
<h2><span class="refentrytitle">xpath</span></h2>
<p>xpath - XML Path Language implementation</p>
<p>API for the XML Path Language implementation XML Path Language implementation XPath is a language for addressing parts of an XML document, designed to be used by both XSLT and XPointer</p>
<p>Author(s): Daniel Veillard </p>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<pre class="synopsis">#define <a href="#XML_XPATH_CHECKNS">XML_XPATH_CHECKNS</a>;
#define <a href="#XML_XPATH_NOVAR">XML_XPATH_NOVAR</a>;
#define <a href="#xmlXPathNodeSetGetLength">xmlXPathNodeSetGetLength</a>(ns);
#define <a href="#xmlXPathNodeSetIsEmpty">xmlXPathNodeSetIsEmpty</a>(ns);
#define <a href="#xmlXPathNodeSetItem">xmlXPathNodeSetItem</a>(ns, index);
typedef struct _xmlNodeSet <a href="#xmlNodeSet">xmlNodeSet</a>;
typedef <a href="libxml2-xpath.html#xmlNodeSet">xmlNodeSet</a> * <a href="#xmlNodeSetPtr">xmlNodeSetPtr</a>;
typedef struct _xmlXPathAxis <a href="#xmlXPathAxis">xmlXPathAxis</a>;
typedef <a href="libxml2-xpath.html#xmlXPathAxis">xmlXPathAxis</a> * <a href="#xmlXPathAxisPtr">xmlXPathAxisPtr</a>;
typedef struct _xmlXPathCompExpr <a href="#xmlXPathCompExpr">xmlXPathCompExpr</a>;
typedef <a href="libxml2-xpath.html#xmlXPathCompExpr">xmlXPathCompExpr</a> * <a href="#xmlXPathCompExprPtr">xmlXPathCompExprPtr</a>;
typedef struct _xmlXPathContext <a href="#xmlXPathContext">xmlXPathContext</a>;
typedef <a href="libxml2-xpath.html#xmlXPathContext">xmlXPathContext</a> * <a href="#xmlXPathContextPtr">xmlXPathContextPtr</a>;
typedef enum <a href="#xmlXPathError">xmlXPathError</a>;
typedef <a href="libxml2-xpath.html#xmlXPathFunct">xmlXPathFunct</a> * <a href="#xmlXPathFuncPtr">xmlXPathFuncPtr</a>;
typedef struct _xmlXPathFunct <a href="#xmlXPathFunct">xmlXPathFunct</a>;
typedef struct _xmlXPathObject <a href="#xmlXPathObject">xmlXPathObject</a>;
typedef <a href="libxml2-xpath.html#xmlXPathObject">xmlXPathObject</a> * <a href="#xmlXPathObjectPtr">xmlXPathObjectPtr</a>;
typedef enum <a href="#xmlXPathObjectType">xmlXPathObjectType</a>;
typedef struct _xmlXPathParserContext <a href="#xmlXPathParserContext">xmlXPathParserContext</a>;
typedef <a href="libxml2-xpath.html#xmlXPathParserContext">xmlXPathParserContext</a> * <a href="#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a>;
typedef struct _xmlXPathType <a href="#xmlXPathType">xmlXPathType</a>;
typedef <a href="libxml2-xpath.html#xmlXPathType">xmlXPathType</a> * <a href="#xmlXPathTypePtr">xmlXPathTypePtr</a>;
typedef struct _xmlXPathVariable <a href="#xmlXPathVariable">xmlXPathVariable</a>;
typedef <a href="libxml2-xpath.html#xmlXPathVariable">xmlXPathVariable</a> * <a href="#xmlXPathVariablePtr">xmlXPathVariablePtr</a>;
typedef <a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> <a href="#xmlXPathAxisFunc">xmlXPathAxisFunc</a> (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br> <a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> cur);
double <a href="#xmlXPathCastBooleanToNumber">xmlXPathCastBooleanToNumber</a> (int val);
<a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * <a href="#xmlXPathCastBooleanToString">xmlXPathCastBooleanToString</a> (int val);
int <a href="#xmlXPathCastNodeSetToBoolean">xmlXPathCastNodeSetToBoolean</a> (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> ns);
double <a href="#xmlXPathCastNodeSetToNumber">xmlXPathCastNodeSetToNumber</a> (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> ns);
<a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * <a href="#xmlXPathCastNodeSetToString">xmlXPathCastNodeSetToString</a> (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> ns);
double <a href="#xmlXPathCastNodeToNumber">xmlXPathCastNodeToNumber</a> (<a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node);
<a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * <a href="#xmlXPathCastNodeToString">xmlXPathCastNodeToString</a> (<a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node);
int <a href="#xmlXPathCastNumberToBoolean">xmlXPathCastNumberToBoolean</a> (double val);
<a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * <a href="#xmlXPathCastNumberToString">xmlXPathCastNumberToString</a> (double val);
int <a href="#xmlXPathCastStringToBoolean">xmlXPathCastStringToBoolean</a> (const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * val);
double <a href="#xmlXPathCastStringToNumber">xmlXPathCastStringToNumber</a> (const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * val);
int <a href="#xmlXPathCastToBoolean">xmlXPathCastToBoolean</a> (<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> val);
double <a href="#xmlXPathCastToNumber">xmlXPathCastToNumber</a> (<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> val);
<a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * <a href="#xmlXPathCastToString">xmlXPathCastToString</a> (<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> val);
int <a href="#xmlXPathCmpNodes">xmlXPathCmpNodes</a> (<a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node1, <br> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node2);
<a href="libxml2-xpath.html#xmlXPathCompExprPtr">xmlXPathCompExprPtr</a> <a href="#xmlXPathCompile">xmlXPathCompile</a> (const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * str);
<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> <a href="#xmlXPathCompiledEval">xmlXPathCompiledEval</a> (<a href="libxml2-xpath.html#xmlXPathCompExprPtr">xmlXPathCompExprPtr</a> comp, <br> <a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctx);
int <a href="#xmlXPathCompiledEvalToBoolean">xmlXPathCompiledEvalToBoolean</a> (<a href="libxml2-xpath.html#xmlXPathCompExprPtr">xmlXPathCompExprPtr</a> comp, <br> <a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt);
int <a href="#xmlXPathContextSetCache">xmlXPathContextSetCache</a> (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt, <br> int active, <br> int value, <br> int options);
<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> <a href="#xmlXPathConvertBoolean">xmlXPathConvertBoolean</a> (<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> val);
typedef int <a href="#xmlXPathConvertFunc">xmlXPathConvertFunc</a> (<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> obj, <br> int type);
<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> <a href="#xmlXPathConvertNumber">xmlXPathConvertNumber</a> (<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> val);
<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> <a href="#xmlXPathConvertString">xmlXPathConvertString</a> (<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> val);
<a href="libxml2-xpath.html#xmlXPathCompExprPtr">xmlXPathCompExprPtr</a> <a href="#xmlXPathCtxtCompile">xmlXPathCtxtCompile</a> (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * str);
<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> <a href="#xmlXPathEval">xmlXPathEval</a> (const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * str, <br> <a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctx);
<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> <a href="#xmlXPathEvalExpression">xmlXPathEvalExpression</a> (const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * str, <br> <a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt);
typedef void <a href="#xmlXPathEvalFunc">xmlXPathEvalFunc</a> (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br> int nargs);
int <a href="#xmlXPathEvalPredicate">xmlXPathEvalPredicate</a> (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt, <br> <a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> res);
void <a href="#xmlXPathFreeCompExpr">xmlXPathFreeCompExpr</a> (<a href="libxml2-xpath.html#xmlXPathCompExprPtr">xmlXPathCompExprPtr</a> comp);
void <a href="#xmlXPathFreeContext">xmlXPathFreeContext</a> (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt);
void <a href="#xmlXPathFreeNodeSet">xmlXPathFreeNodeSet</a> (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> obj);
void <a href="#xmlXPathFreeNodeSetList">xmlXPathFreeNodeSetList</a> (<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> obj);
void <a href="#xmlXPathFreeObject">xmlXPathFreeObject</a> (<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> obj);
typedef <a href="libxml2-xpath.html#xmlXPathFunction">xmlXPathFunction</a> <a href="#xmlXPathFuncLookupFunc">xmlXPathFuncLookupFunc</a> (void * ctxt, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * ns_uri);
typedef void <a href="#xmlXPathFunction">xmlXPathFunction</a> (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br> int nargs);
void <a href="#xmlXPathInit">xmlXPathInit</a> (void);
int <a href="#xmlXPathIsInf">xmlXPathIsInf</a> (double val);
int <a href="#xmlXPathIsNaN">xmlXPathIsNaN</a> (double val);
<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> <a href="#xmlXPathNewContext">xmlXPathNewContext</a> (<a href="libxml2-tree.html#xmlDocPtr">xmlDocPtr</a> doc);
<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> <a href="#xmlXPathNodeEval">xmlXPathNodeEval</a> (<a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * str, <br> <a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctx);
<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> <a href="#xmlXPathNodeSetCreate">xmlXPathNodeSetCreate</a> (<a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> val);
<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> <a href="#xmlXPathObjectCopy">xmlXPathObjectCopy</a> (<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> val);
long <a href="#xmlXPathOrderDocElems">xmlXPathOrderDocElems</a> (<a href="libxml2-tree.html#xmlDocPtr">xmlDocPtr</a> doc);
int <a href="#xmlXPathSetContextNode">xmlXPathSetContextNode</a> (<a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node, <br> <a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctx);
typedef <a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> <a href="#xmlXPathVariableLookupFunc">xmlXPathVariableLookupFunc</a> (void * ctxt, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * ns_uri);
</pre>
</div>
<div class="refsect1" lang="en"><h2>Description</h2></div>
<div class="refsect1" lang="en">
<h2>Details</h2>
<div class="refsect2" lang="en">
<div class="refsect2" lang="en">
<h3>
<a name="XML_XPATH_CHECKNS">Macro </a>XML_XPATH_CHECKNS</h3>
<pre class="programlisting">#define <a href="#XML_XPATH_CHECKNS">XML_XPATH_CHECKNS</a>;
</pre>
<p>check namespaces at compilation</p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="XML_XPATH_NOVAR">Macro </a>XML_XPATH_NOVAR</h3>
<pre class="programlisting">#define <a href="#XML_XPATH_NOVAR">XML_XPATH_NOVAR</a>;
</pre>
<p>forbid variables in expression</p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathNodeSetGetLength">Macro </a>xmlXPathNodeSetGetLength</h3>
<pre class="programlisting">#define <a href="#xmlXPathNodeSetGetLength">xmlXPathNodeSetGetLength</a>(ns);
</pre>
<p>Implement a functionality similar to the DOM NodeList.length. Returns the number of nodes in the node-set.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>ns</tt></i>:</span></td>
<td>a node-set</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathNodeSetIsEmpty">Macro </a>xmlXPathNodeSetIsEmpty</h3>
<pre class="programlisting">#define <a href="#xmlXPathNodeSetIsEmpty">xmlXPathNodeSetIsEmpty</a>(ns);
</pre>
<p>Checks whether @ns is empty or not. Returns %TRUE if @ns is an empty node-set.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>ns</tt></i>:</span></td>
<td>a node-set</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathNodeSetItem">Macro </a>xmlXPathNodeSetItem</h3>
<pre class="programlisting">#define <a href="#xmlXPathNodeSetItem">xmlXPathNodeSetItem</a>(ns, index);
</pre>
<p>Implements a functionality similar to the DOM NodeList.item(). Returns the <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> at the given @index in @ns or NULL if @index is out of range (0 to length-1)</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>ns</tt></i>:</span></td>
<td>a node-set</td>
</tr>
<tr>
<td><span class="term"><i><tt>index</tt></i>:</span></td>
<td>index of a node in the set</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlNodeSet">Structure </a>xmlNodeSet</h3>
<pre class="programlisting">struct _xmlNodeSet {
int nodeNr : number of nodes in the set
int nodeMax : size of the array as allocated
<a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> * nodeTab : array of nodes in no particular order @@ with_ns to check whether nam
} xmlNodeSet;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlNodeSetPtr">Typedef </a>xmlNodeSetPtr</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlNodeSet">xmlNodeSet</a> * xmlNodeSetPtr;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathAxis">Structure </a>xmlXPathAxis</h3>
<pre class="programlisting">struct _xmlXPathAxis {
const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name : the axis name
<a href="libxml2-xpath.html#xmlXPathAxisFunc">xmlXPathAxisFunc</a> func : the search function
} xmlXPathAxis;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathAxisPtr">Typedef </a>xmlXPathAxisPtr</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathAxis">xmlXPathAxis</a> * xmlXPathAxisPtr;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathCompExpr">Structure </a>xmlXPathCompExpr</h3>
<pre class="programlisting">struct _xmlXPathCompExpr {
The content of this structure is not made public by the API.
} xmlXPathCompExpr;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathCompExprPtr">Typedef </a>xmlXPathCompExprPtr</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathCompExpr">xmlXPathCompExpr</a> * xmlXPathCompExprPtr;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathContext">Structure </a>xmlXPathContext</h3>
<pre class="programlisting">struct _xmlXPathContext {
<a href="libxml2-tree.html#xmlDocPtr">xmlDocPtr</a> doc : The current document
<a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node : The current node
int nb_variables_unused : unused (hash table)
int max_variables_unused : unused (hash table)
<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> varHash : Hash table of defined variables
int nb_types : number of defined types
int max_types : max number of types
<a href="libxml2-xpath.html#xmlXPathTypePtr">xmlXPathTypePtr</a> types : Array of defined types
int nb_funcs_unused : unused (hash table)
int max_funcs_unused : unused (hash table)
<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> funcHash : Hash table of defined funcs
int nb_axis : number of defined axis
int max_axis : max number of axis
<a href="libxml2-xpath.html#xmlXPathAxisPtr">xmlXPathAxisPtr</a> axis : Array of defined axis the namespace nodes of the context node
<a href="libxml2-tree.html#xmlNsPtr">xmlNsPtr</a> * namespaces : Array of namespaces
int nsNr : number of namespace in scope
void * user : function to free extra variables
int contextSize : the context size
int proximityPosition : the proximity position extra stuff for XPointer
int xptr : is this an XPointer context?
<a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> here : for here()
<a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> origin : for origin() the set of namespace declarations in scope for the expre
<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> nsHash : The namespaces hash table
<a href="libxml2-xpath.html#xmlXPathVariableLookupFunc">xmlXPathVariableLookupFunc</a> varLookupFunc : variable lookup func
void * varLookupData : variable lookup data Possibility to link in an extra item
void * extra : needed for XSLT The function name and URI when calling a function
const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * function
const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * functionURI : function lookup function and data
<a href="libxml2-xpath.html#xmlXPathFuncLookupFunc">xmlXPathFuncLookupFunc</a> funcLookupFunc : function lookup func
void * funcLookupData : function lookup data temporary namespace lists kept for walking the n
<a href="libxml2-tree.html#xmlNsPtr">xmlNsPtr</a> * tmpNsList : Array of namespaces
int tmpNsNr : number of namespaces in scope error reporting mechanism
void * userData : user specific data block
<a href="libxml2-xmlerror.html#xmlStructuredErrorFunc">xmlStructuredErrorFunc</a> error : the callback in case of errors
<a href="libxml2-xmlerror.html#xmlError">xmlError</a> lastError : the last error
<a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> debugNode : the source node XSLT dictionary
<a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict : dictionary if any
int flags : flags to control compilation Cache for reusal of XPath objects
void * cache : Resource limits
unsigned long opLimit
unsigned long opCount
int depth
} xmlXPathContext;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathContextPtr">Typedef </a>xmlXPathContextPtr</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathContext">xmlXPathContext</a> * xmlXPathContextPtr;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathError">Enum </a>xmlXPathError</h3>
<pre class="programlisting">enum <a href="#xmlXPathError">xmlXPathError</a> {
<a name="XPATH_EXPRESSION_OK">XPATH_EXPRESSION_OK</a> = 0
<a name="XPATH_NUMBER_ERROR">XPATH_NUMBER_ERROR</a> = 1
<a name="XPATH_UNFINISHED_LITERAL_ERROR">XPATH_UNFINISHED_LITERAL_ERROR</a> = 2
<a name="XPATH_START_LITERAL_ERROR">XPATH_START_LITERAL_ERROR</a> = 3
<a name="XPATH_VARIABLE_REF_ERROR">XPATH_VARIABLE_REF_ERROR</a> = 4
<a name="XPATH_UNDEF_VARIABLE_ERROR">XPATH_UNDEF_VARIABLE_ERROR</a> = 5
<a name="XPATH_INVALID_PREDICATE_ERROR">XPATH_INVALID_PREDICATE_ERROR</a> = 6
<a name="XPATH_EXPR_ERROR">XPATH_EXPR_ERROR</a> = 7
<a name="XPATH_UNCLOSED_ERROR">XPATH_UNCLOSED_ERROR</a> = 8
<a name="XPATH_UNKNOWN_FUNC_ERROR">XPATH_UNKNOWN_FUNC_ERROR</a> = 9
<a name="XPATH_INVALID_OPERAND">XPATH_INVALID_OPERAND</a> = 10
<a name="XPATH_INVALID_TYPE">XPATH_INVALID_TYPE</a> = 11
<a name="XPATH_INVALID_ARITY">XPATH_INVALID_ARITY</a> = 12
<a name="XPATH_INVALID_CTXT_SIZE">XPATH_INVALID_CTXT_SIZE</a> = 13
<a name="XPATH_INVALID_CTXT_POSITION">XPATH_INVALID_CTXT_POSITION</a> = 14
<a name="XPATH_MEMORY_ERROR">XPATH_MEMORY_ERROR</a> = 15
<a name="XPTR_SYNTAX_ERROR">XPTR_SYNTAX_ERROR</a> = 16
<a name="XPTR_RESOURCE_ERROR">XPTR_RESOURCE_ERROR</a> = 17
<a name="XPTR_SUB_RESOURCE_ERROR">XPTR_SUB_RESOURCE_ERROR</a> = 18
<a name="XPATH_UNDEF_PREFIX_ERROR">XPATH_UNDEF_PREFIX_ERROR</a> = 19
<a name="XPATH_ENCODING_ERROR">XPATH_ENCODING_ERROR</a> = 20
<a name="XPATH_INVALID_CHAR_ERROR">XPATH_INVALID_CHAR_ERROR</a> = 21
<a name="XPATH_INVALID_CTXT">XPATH_INVALID_CTXT</a> = 22
<a name="XPATH_STACK_ERROR">XPATH_STACK_ERROR</a> = 23
<a name="XPATH_FORBID_VARIABLE_ERROR">XPATH_FORBID_VARIABLE_ERROR</a> = 24
<a name="XPATH_OP_LIMIT_EXCEEDED">XPATH_OP_LIMIT_EXCEEDED</a> = 25
<a name="XPATH_RECURSION_LIMIT_EXCEEDED">XPATH_RECURSION_LIMIT_EXCEEDED</a> = 26
};
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathFuncPtr">Typedef </a>xmlXPathFuncPtr</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathFunct">xmlXPathFunct</a> * xmlXPathFuncPtr;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathFunct">Structure </a>xmlXPathFunct</h3>
<pre class="programlisting">struct _xmlXPathFunct {
const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name : the function name
<a href="libxml2-xpath.html#xmlXPathEvalFunc">xmlXPathEvalFunc</a> func : the evaluation function
} xmlXPathFunct;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathObject">Structure </a>xmlXPathObject</h3>
<pre class="programlisting">struct _xmlXPathObject {
<a href="libxml2-xpath.html#xmlXPathObjectType">xmlXPathObjectType</a> type
<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodesetval
int boolval
double floatval
<a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * stringval
void * user
int index
void * user2
int index2
} xmlXPathObject;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathObjectPtr">Typedef </a>xmlXPathObjectPtr</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObject">xmlXPathObject</a> * xmlXPathObjectPtr;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathObjectType">Enum </a>xmlXPathObjectType</h3>
<pre class="programlisting">enum <a href="#xmlXPathObjectType">xmlXPathObjectType</a> {
<a name="XPATH_UNDEFINED">XPATH_UNDEFINED</a> = 0
<a name="XPATH_NODESET">XPATH_NODESET</a> = 1
<a name="XPATH_BOOLEAN">XPATH_BOOLEAN</a> = 2
<a name="XPATH_NUMBER">XPATH_NUMBER</a> = 3
<a name="XPATH_STRING">XPATH_STRING</a> = 4
<a name="XPATH_POINT">XPATH_POINT</a> = 5
<a name="XPATH_RANGE">XPATH_RANGE</a> = 6
<a name="XPATH_LOCATIONSET">XPATH_LOCATIONSET</a> = 7
<a name="XPATH_USERS">XPATH_USERS</a> = 8
<a name="XPATH_XSLT_TREE">XPATH_XSLT_TREE</a> = 9 /* An XSLT value tree, non modifiable */
};
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathParserContext">Structure </a>xmlXPathParserContext</h3>
<pre class="programlisting">struct _xmlXPathParserContext {
const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * cur : the current char being parsed
const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * base : the full expression
int error : error code
<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> context : the evaluation context
<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> value : the current value
int valueNr : number of values stacked
int valueMax : max number of values stacked
<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> * valueTab : stack of values
<a href="libxml2-xpath.html#xmlXPathCompExprPtr">xmlXPathCompExprPtr</a> comp : the precompiled expression
int xptr : it this an XPointer expression
<a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> ancestor : used for walking preceding axis
int valueFrame : unused
} xmlXPathParserContext;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathParserContextPtr">Typedef </a>xmlXPathParserContextPtr</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathParserContext">xmlXPathParserContext</a> * xmlXPathParserContextPtr;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathType">Structure </a>xmlXPathType</h3>
<pre class="programlisting">struct _xmlXPathType {
const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name : the type name
<a href="libxml2-xpath.html#xmlXPathConvertFunc">xmlXPathConvertFunc</a> func : the conversion function
} xmlXPathType;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathTypePtr">Typedef </a>xmlXPathTypePtr</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathType">xmlXPathType</a> * xmlXPathTypePtr;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathVariable">Structure </a>xmlXPathVariable</h3>
<pre class="programlisting">struct _xmlXPathVariable {
const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name : the variable name
<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> value : the value
} xmlXPathVariable;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathVariablePtr">Typedef </a>xmlXPathVariablePtr</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathVariable">xmlXPathVariable</a> * xmlXPathVariablePtr;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathAxisFunc"></a>Function type xmlXPathAxisFunc</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathAxisFunc (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br> <a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> cur)<br>
</pre>
<p>An axis traversal function. To traverse an axis, the engine calls the first time with cur == NULL and repeat until the function returns NULL indicating the end of the axis traversal.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>ctxt</tt></i>:</span></td>
<td>the XPath interpreter context</td>
</tr>
<tr>
<td><span class="term"><i><tt>cur</tt></i>:</span></td>
<td>the previous node being explored on that axis</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the next node in that axis or NULL if at the end of the axis.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathConvertFunc"></a>Function type xmlXPathConvertFunc</h3>
<pre class="programlisting">int xmlXPathConvertFunc (<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> obj, <br> int type)<br>
</pre>
<p>A conversion function is associated to a type and used to cast the new type to primitive values.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>obj</tt></i>:</span></td>
<td>an XPath object</td>
</tr>
<tr>
<td><span class="term"><i><tt>type</tt></i>:</span></td>
<td>the number of the target type</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>-1 in case of error, 0 otherwise</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathEvalFunc"></a>Function type xmlXPathEvalFunc</h3>
<pre class="programlisting">void xmlXPathEvalFunc (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br> int nargs)<br>
</pre>
<p>An XPath evaluation function, the parameters are on the XPath context stack.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>ctxt</tt></i>:</span></td>
<td>an XPath parser context</td>
</tr>
<tr>
<td><span class="term"><i><tt>nargs</tt></i>:</span></td>
<td>the number of arguments passed to the function</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathFuncLookupFunc"></a>Function type xmlXPathFuncLookupFunc</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathFunction">xmlXPathFunction</a> xmlXPathFuncLookupFunc (void * ctxt, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * ns_uri)<br>
</pre>
<p>Prototype for callbacks used to plug function lookup in the XPath engine.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>ctxt</tt></i>:</span></td>
<td>an XPath context</td>
</tr>
<tr>
<td><span class="term"><i><tt>name</tt></i>:</span></td>
<td>name of the function</td>
</tr>
<tr>
<td><span class="term"><i><tt>ns_uri</tt></i>:</span></td>
<td>the namespace name hosting this function</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the XPath function or NULL if not found.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathFunction"></a>Function type xmlXPathFunction</h3>
<pre class="programlisting">void xmlXPathFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br> int nargs)<br>
</pre>
<p>An XPath function. The arguments (if any) are popped out from the context stack and the result is pushed on the stack.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>ctxt</tt></i>:</span></td>
<td>the XPath interprestation context</td>
</tr>
<tr>
<td><span class="term"><i><tt>nargs</tt></i>:</span></td>
<td>the number of arguments</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathVariableLookupFunc"></a>Function type xmlXPathVariableLookupFunc</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathVariableLookupFunc (void * ctxt, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * ns_uri)<br>
</pre>
<p>Prototype for callbacks used to plug variable lookup in the XPath engine.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>ctxt</tt></i>:</span></td>
<td>an XPath context</td>
</tr>
<tr>
<td><span class="term"><i><tt>name</tt></i>:</span></td>
<td>name of the variable</td>
</tr>
<tr>
<td><span class="term"><i><tt>ns_uri</tt></i>:</span></td>
<td>the namespace name hosting this variable</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the XPath object value or NULL if not found.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathNAN">Variable </a>xmlXPathNAN</h3>
<pre class="programlisting">double xmlXPathNAN;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathNINF">Variable </a>xmlXPathNINF</h3>
<pre class="programlisting">double xmlXPathNINF;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathPINF">Variable </a>xmlXPathPINF</h3>
<pre class="programlisting">double xmlXPathPINF;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathCastBooleanToNumber"></a>xmlXPathCastBooleanToNumber ()</h3>
<pre class="programlisting">double xmlXPathCastBooleanToNumber (int val)<br>
</pre>
<p>Converts a boolean to its number value</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>val</tt></i>:</span></td>
<td>a boolean</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the number value</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathCastBooleanToString"></a>xmlXPathCastBooleanToString ()</h3>
<pre class="programlisting"><a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * xmlXPathCastBooleanToString (int val)<br>
</pre>
<p>Converts a boolean to its string value.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>val</tt></i>:</span></td>
<td>a boolean</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>a newly allocated string.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathCastNodeSetToBoolean"></a>xmlXPathCastNodeSetToBoolean ()</h3>
<pre class="programlisting">int xmlXPathCastNodeSetToBoolean (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> ns)<br>
</pre>
<p>Converts a node-set to its boolean value</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>ns</tt></i>:</span></td>
<td>a node-set</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the boolean value</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathCastNodeSetToNumber"></a>xmlXPathCastNodeSetToNumber ()</h3>
<pre class="programlisting">double xmlXPathCastNodeSetToNumber (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> ns)<br>
</pre>
<p>Converts a node-set to its number value</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>ns</tt></i>:</span></td>
<td>a node-set</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the number value</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathCastNodeSetToString"></a>xmlXPathCastNodeSetToString ()</h3>
<pre class="programlisting"><a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * xmlXPathCastNodeSetToString (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> ns)<br>
</pre>
<p>Converts a node-set to its string value.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>ns</tt></i>:</span></td>
<td>a node-set</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>a newly allocated string.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathCastNodeToNumber"></a>xmlXPathCastNodeToNumber ()</h3>
<pre class="programlisting">double xmlXPathCastNodeToNumber (<a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node)<br>
</pre>
<p>Converts a node to its number value</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>node</tt></i>:</span></td>
<td>a node</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the number value</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathCastNodeToString"></a>xmlXPathCastNodeToString ()</h3>
<pre class="programlisting"><a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * xmlXPathCastNodeToString (<a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node)<br>
</pre>
<p>Converts a node to its string value.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>node</tt></i>:</span></td>
<td>a node</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>a newly allocated string.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathCastNumberToBoolean"></a>xmlXPathCastNumberToBoolean ()</h3>
<pre class="programlisting">int xmlXPathCastNumberToBoolean (double val)<br>
</pre>
<p>Converts a number to its boolean value</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>val</tt></i>:</span></td>
<td>a number</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the boolean value</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathCastNumberToString"></a>xmlXPathCastNumberToString ()</h3>
<pre class="programlisting"><a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * xmlXPathCastNumberToString (double val)<br>
</pre>
<p>Converts a number to its string value.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>val</tt></i>:</span></td>
<td>a number</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>a newly allocated string.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathCastStringToBoolean"></a>xmlXPathCastStringToBoolean ()</h3>
<pre class="programlisting">int xmlXPathCastStringToBoolean (const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * val)<br>
</pre>
<p>Converts a string to its boolean value</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>val</tt></i>:</span></td>
<td>a string</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the boolean value</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathCastStringToNumber"></a>xmlXPathCastStringToNumber ()</h3>
<pre class="programlisting">double xmlXPathCastStringToNumber (const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * val)<br>
</pre>
<p>Converts a string to its number value</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>val</tt></i>:</span></td>
<td>a string</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the number value</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathCastToBoolean"></a>xmlXPathCastToBoolean ()</h3>
<pre class="programlisting">int xmlXPathCastToBoolean (<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> val)<br>
</pre>
<p>Converts an XPath object to its boolean value</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>val</tt></i>:</span></td>
<td>an XPath object</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the boolean value</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathCastToNumber"></a>xmlXPathCastToNumber ()</h3>
<pre class="programlisting">double xmlXPathCastToNumber (<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> val)<br>
</pre>
<p>Converts an XPath object to its number value</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>val</tt></i>:</span></td>
<td>an XPath object</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the number value</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathCastToString"></a>xmlXPathCastToString ()</h3>
<pre class="programlisting"><a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * xmlXPathCastToString (<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> val)<br>
</pre>
<p>Converts an existing object to its string() equivalent</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>val</tt></i>:</span></td>
<td>an XPath object</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the allocated string value of the object, NULL in case of error. It's up to the caller to free the string memory with xmlFree().</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathCmpNodes"></a>xmlXPathCmpNodes ()</h3>
<pre class="programlisting">int xmlXPathCmpNodes (<a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node1, <br> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node2)<br>
</pre>
<p>Compare two nodes w.r.t document order</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>node1</tt></i>:</span></td>
<td>the first node</td>
</tr>
<tr>
<td><span class="term"><i><tt>node2</tt></i>:</span></td>
<td>the second node</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>-2 in case of error 1 if first point < second point, 0 if it's the same node, -1 otherwise</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathCompile"></a>xmlXPathCompile ()</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathCompExprPtr">xmlXPathCompExprPtr</a> xmlXPathCompile (const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * str)<br>
</pre>
<p>Compile an XPath expression</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>str</tt></i>:</span></td>
<td>the XPath expression</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the <a href="libxml2-xpath.html#xmlXPathCompExprPtr">xmlXPathCompExprPtr</a> resulting from the compilation or NULL. the caller has to free the object.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathCompiledEval"></a>xmlXPathCompiledEval ()</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathCompiledEval (<a href="libxml2-xpath.html#xmlXPathCompExprPtr">xmlXPathCompExprPtr</a> comp, <br> <a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctx)<br>
</pre>
<p>Evaluate the Precompiled XPath expression in the given context.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>comp</tt></i>:</span></td>
<td>the compiled XPath expression</td>
</tr>
<tr>
<td><span class="term"><i><tt>ctx</tt></i>:</span></td>
<td>the XPath context</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the <a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> resulting from the evaluation or NULL. the caller has to free the object.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathCompiledEvalToBoolean"></a>xmlXPathCompiledEvalToBoolean ()</h3>
<pre class="programlisting">int xmlXPathCompiledEvalToBoolean (<a href="libxml2-xpath.html#xmlXPathCompExprPtr">xmlXPathCompExprPtr</a> comp, <br> <a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt)<br>
</pre>
<p>Applies the XPath boolean() function on the result of the given compiled expression.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>comp</tt></i>:</span></td>
<td>the compiled XPath expression</td>
</tr>
<tr>
<td><span class="term"><i><tt>ctxt</tt></i>:</span></td>
<td>the XPath context</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>1 if the expression evaluated to true, 0 if to false and -1 in API and internal errors.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathContextSetCache"></a>xmlXPathContextSetCache ()</h3>
<pre class="programlisting">int xmlXPathContextSetCache (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt, <br> int active, <br> int value, <br> int options)<br>
</pre>
<p>Creates/frees an object cache on the XPath context. If activates XPath objects (xmlXPathObject) will be cached internally to be reused. @options: 0: This will set the XPath object caching: @value: This will set the maximum number of XPath objects to be cached per slot There are 5 slots for: node-set, string, number, boolean, and misc objects. Use <0 for the default number (100). Other values for @options have currently no effect.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>ctxt</tt></i>:</span></td>
<td>the XPath context</td>
</tr>
<tr>
<td><span class="term"><i><tt>active</tt></i>:</span></td>
<td>enables/disables (creates/frees) the cache</td>
</tr>
<tr>
<td><span class="term"><i><tt>value</tt></i>:</span></td>
<td>a value with semantics dependent on @options</td>
</tr>
<tr>
<td><span class="term"><i><tt>options</tt></i>:</span></td>
<td>options (currently only the value 0 is used)</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>0 if the setting succeeded, and -1 on API or internal errors.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathConvertBoolean"></a>xmlXPathConvertBoolean ()</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathConvertBoolean (<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> val)<br>
</pre>
<p>Converts an existing object to its boolean() equivalent</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>val</tt></i>:</span></td>
<td>an XPath object</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the new object, the old one is freed (or the operation is done directly on @val)</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathConvertNumber"></a>xmlXPathConvertNumber ()</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathConvertNumber (<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> val)<br>
</pre>
<p>Converts an existing object to its number() equivalent</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>val</tt></i>:</span></td>
<td>an XPath object</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the new object, the old one is freed (or the operation is done directly on @val)</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathConvertString"></a>xmlXPathConvertString ()</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathConvertString (<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> val)<br>
</pre>
<p>Converts an existing object to its string() equivalent</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>val</tt></i>:</span></td>
<td>an XPath object</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the new object, the old one is freed (or the operation is done directly on @val)</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathCtxtCompile"></a>xmlXPathCtxtCompile ()</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathCompExprPtr">xmlXPathCompExprPtr</a> xmlXPathCtxtCompile (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * str)<br>
</pre>
<p>Compile an XPath expression</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>ctxt</tt></i>:</span></td>
<td>an XPath context</td>
</tr>
<tr>
<td><span class="term"><i><tt>str</tt></i>:</span></td>
<td>the XPath expression</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the <a href="libxml2-xpath.html#xmlXPathCompExprPtr">xmlXPathCompExprPtr</a> resulting from the compilation or NULL. the caller has to free the object.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathEval"></a>xmlXPathEval ()</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathEval (const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * str, <br> <a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctx)<br>
</pre>
<p>Evaluate the XPath Location Path in the given context.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>str</tt></i>:</span></td>
<td>the XPath expression</td>
</tr>
<tr>
<td><span class="term"><i><tt>ctx</tt></i>:</span></td>
<td>the XPath context</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the <a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> resulting from the evaluation or NULL. the caller has to free the object.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathEvalExpression"></a>xmlXPathEvalExpression ()</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathEvalExpression (const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * str, <br> <a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt)<br>
</pre>
<p>Alias for xmlXPathEval().</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>str</tt></i>:</span></td>
<td>the XPath expression</td>
</tr>
<tr>
<td><span class="term"><i><tt>ctxt</tt></i>:</span></td>
<td>the XPath context</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the <a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> resulting from the evaluation or NULL. the caller has to free the object.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathEvalPredicate"></a>xmlXPathEvalPredicate ()</h3>
<pre class="programlisting">int xmlXPathEvalPredicate (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt, <br> <a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> res)<br>
</pre>
<p>Evaluate a predicate result for the current node. A PredicateExpr is evaluated by evaluating the Expr and converting the result to a boolean. If the result is a number, the result will be converted to true if the number is equal to the position of the context node in the context node list (as returned by the position function) and will be converted to false otherwise; if the result is not a number, then the result will be converted as if by a call to the boolean function.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>ctxt</tt></i>:</span></td>
<td>the XPath context</td>
</tr>
<tr>
<td><span class="term"><i><tt>res</tt></i>:</span></td>
<td>the Predicate Expression evaluation result</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>1 if predicate is true, 0 otherwise</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathFreeCompExpr"></a>xmlXPathFreeCompExpr ()</h3>
<pre class="programlisting">void xmlXPathFreeCompExpr (<a href="libxml2-xpath.html#xmlXPathCompExprPtr">xmlXPathCompExprPtr</a> comp)<br>
</pre>
<p>Free up the memory allocated by @comp</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>comp</tt></i>:</span></td>
<td>an XPATH comp</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathFreeContext"></a>xmlXPathFreeContext ()</h3>
<pre class="programlisting">void xmlXPathFreeContext (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt)<br>
</pre>
<p>Free up an <a href="libxml2-xpath.html#xmlXPathContext">xmlXPathContext</a></p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>ctxt</tt></i>:</span></td>
<td>the context to free</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathFreeNodeSet"></a>xmlXPathFreeNodeSet ()</h3>
<pre class="programlisting">void xmlXPathFreeNodeSet (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> obj)<br>
</pre>
<p>Free the NodeSet compound (not the actual nodes !).</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>obj</tt></i>:</span></td>
<td>the <a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> to free</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathFreeNodeSetList"></a>xmlXPathFreeNodeSetList ()</h3>
<pre class="programlisting">void xmlXPathFreeNodeSetList (<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> obj)<br>
</pre>
<p>Free up the <a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> @obj but don't deallocate the objects in the list contrary to xmlXPathFreeObject().</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>obj</tt></i>:</span></td>
<td>an existing NodeSetList object</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathFreeObject"></a>xmlXPathFreeObject ()</h3>
<pre class="programlisting">void xmlXPathFreeObject (<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> obj)<br>
</pre>
<p>Free up an <a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> object.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>obj</tt></i>:</span></td>
<td>the object to free</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathInit"></a>xmlXPathInit ()</h3>
<pre class="programlisting">void xmlXPathInit (void)<br>
</pre>
<p>DEPRECATED: Alias for <a href="libxml2-parser.html#xmlInitParser">xmlInitParser</a>.</p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathIsInf"></a>xmlXPathIsInf ()</h3>
<pre class="programlisting">int xmlXPathIsInf (double val)<br>
</pre>
<p></p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>val</tt></i>:</span></td>
<td>a double value</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>1 if the value is +Infinite, -1 if -Infinite, 0 otherwise</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathIsNaN"></a>xmlXPathIsNaN ()</h3>
<pre class="programlisting">int xmlXPathIsNaN (double val)<br>
</pre>
<p></p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>val</tt></i>:</span></td>
<td>a double value</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>1 if the value is a NaN, 0 otherwise</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathNewContext"></a>xmlXPathNewContext ()</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> xmlXPathNewContext (<a href="libxml2-tree.html#xmlDocPtr">xmlDocPtr</a> doc)<br>
</pre>
<p>Create a new <a href="libxml2-xpath.html#xmlXPathContext">xmlXPathContext</a></p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>doc</tt></i>:</span></td>
<td>the XML document</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the <a href="libxml2-xpath.html#xmlXPathContext">xmlXPathContext</a> just allocated. The caller will need to free it.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathNodeEval"></a>xmlXPathNodeEval ()</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathNodeEval (<a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * str, <br> <a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctx)<br>
</pre>
<p>Evaluate the XPath Location Path in the given context. The node 'node' is set as the context node. The context node is not restored.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>node</tt></i>:</span></td>
<td>the node to to use as the context node</td>
</tr>
<tr>
<td><span class="term"><i><tt>str</tt></i>:</span></td>
<td>the XPath expression</td>
</tr>
<tr>
<td><span class="term"><i><tt>ctx</tt></i>:</span></td>
<td>the XPath context</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the <a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> resulting from the evaluation or NULL. the caller has to free the object.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathNodeSetCreate"></a>xmlXPathNodeSetCreate ()</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> xmlXPathNodeSetCreate (<a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> val)<br>
</pre>
<p>Create a new <a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> of type double and of value @val</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>val</tt></i>:</span></td>
<td>an initial xmlNodePtr, or NULL</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the newly created object.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathObjectCopy"></a>xmlXPathObjectCopy ()</h3>
<pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathObjectCopy (<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> val)<br>
</pre>
<p>allocate a new copy of a given object</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>val</tt></i>:</span></td>
<td>the original object</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the newly created object.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathOrderDocElems"></a>xmlXPathOrderDocElems ()</h3>
<pre class="programlisting">long xmlXPathOrderDocElems (<a href="libxml2-tree.html#xmlDocPtr">xmlDocPtr</a> doc)<br>
</pre>
<p>Call this routine to speed up XPath computation on static documents. This stamps all the element nodes with the document order Like for line information, the order is kept in the element->content field, the value stored is actually - the node number (starting at -1) to be able to differentiate from line numbers.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>doc</tt></i>:</span></td>
<td>an input document</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the number of elements found in the document or -1 in case of error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlXPathSetContextNode"></a>xmlXPathSetContextNode ()</h3>
<pre class="programlisting">int xmlXPathSetContextNode (<a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node, <br> <a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctx)<br>
</pre>
<p>Sets 'node' as the context node. The node must be in the same document as that associated with the context.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>node</tt></i>:</span></td>
<td>the node to to use as the context node</td>
</tr>
<tr>
<td><span class="term"><i><tt>ctx</tt></i>:</span></td>
<td>the XPath context</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>-1 in case of error or 0 if successful</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
</div>
</div>
</body>
</html>
|
