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diff --git a/src/yelp-transform.h b/src/yelp-transform.h
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+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 4 -*- */
+/*
+ * Copyright (C) 2003-2007 Shaun McCance  <shaunm@gnome.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Author: Shaun McCance  <shaunm@gnome.org>
+ */
+
+#ifndef __YELP_TRANSFORM_H__
+#define __YELP_TRANSFORM_H__
+
+#include <glib.h>
+#include <libxml/tree.h>
+#include <libxslt/xslt.h>
+#include <libxslt/transform.h>
+
+#include "yelp-error.h"
+
+typedef struct _YelpTransform YelpTransform;
+
+typedef enum {
+    YELP_TRANSFORM_CHUNK,
+    YELP_TRANSFORM_ERROR,
+    YELP_TRANSFORM_FINAL
+} YelpTransformSignal;
+
+typedef void  (*YelpTransformFunc)  (YelpTransform       *transform,
+				     YelpTransformSignal  signal,
+				     gpointer             func_data,
+				     gpointer             user_data);
+
+struct _YelpTransform {
+    xmlDocPtr               inputDoc;
+    xmlDocPtr               outputDoc;
+    xsltStylesheetPtr       stylesheet;
+    xsltTransformContextPtr context;
+
+    YelpTransformFunc       func;
+
+    gchar                 **params;
+
+    GThread                *thread;
+    GMutex                 *mutex;
+    GAsyncQueue            *queue;
+    GHashTable             *chunks;
+
+    gboolean                running;
+    gboolean                released;
+    gint                    idle_funcs;
+    gint                    free_attempts;
+
+    gpointer                user_data;
+
+    YelpError              *error;
+};
+
+YelpTransform  *yelp_transform_new         (gchar               *stylesheet,
+					    YelpTransformFunc    func,
+					    gpointer             user_data);
+void            yelp_transform_start       (YelpTransform       *transform,
+					    xmlDocPtr            document,
+					    gchar              **params);
+gchar *         yelp_transform_eat_chunk   (YelpTransform       *transform,
+					    gchar               *chunk_id);
+void            yelp_transform_release     (YelpTransform       *transform);
+
+#endif /* __YELP_TRANSFORM_H__ */