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+Revision history for XML-Simple
+
+2.20      2012-06-20 22:00:13 Pacific/Auckland
+  - Suppress warning from empty CDATA section (RT#58359 from Juan Antonio
+    Navarro Pérez)
+
+2.19_02   2012-06-19 20:33:53 Pacific/Auckland
+  - Reinstate XML::SAX::Expat dependency
+  - Fix warnings tests (broken in 2.19_01) which rely on global $^W
+
+2.19_01   2012-06-17 23:27:22 Pacific/Auckland
+  - Use lexical filehandles instead of old-style fileglobs (RT#77787 from
+    Quanah)
+  - Restrict scope of :strict mode to calling package (RT#41562 from Hannu
+    Aronsson)
+  - Fix POD typo (RT#45414 from Anirvan Chatterjee)
+  - Update POD to reflect best practise regarding :strict and options
+  - Change minimum Perl requirement to 5.008
+  - Switch to using Dist::Zilla for release management
+
+2.18  Aug 15 2007
+  - Non-unique key attribute values now trigger a warning (or a fatal
+    error in strict mode) rather than silently discarding data (patch
+    from Daniel Baysinger)
+
+2.17  Aug 02 2007
+  - Added parse_string(), parse_file() and parse_fh() methods
+  - Added default_config_file(), and build_simple_tree() hook methods
+  - Tweak to implementation of exporting (patch from Stuart Moore)
+  - Documented hook methods
+  - Fixed test suite race condition (RT#28603 from Andreas J. König)
+
+2.16  Oct 30 2006
+  - Added test/fix for bad GroupTags option (report from Lee Goddard)
+  - Added new_hashref() hook method
+  - refactored cache save/restore methods for easier overriding
+
+2.15  Oct 03 2006
+  - Makefile.PL changes: reject known-bad PurePerl and RTF parser modules;
+    default to XML::SAX::Expat if no parser installed
+  - allow '.' characters in variable names (suggested by Cosimo Streppone)
+  - fix output of undefs in arrayrefs with SuppressEmpty (reported by
+    かんな - Kanna)
+  - tidy up code and docs around lexical filehandle passed to OutputFile
+    (report from Helge Sauer)
+  - reduce memory usage by passing XML strings by reference (patch from
+    Dan Sully)
+
+2.14  Jan 29 2005
+  - unlink and lock fixes for VMS (patch from Peter (Stig) Edwards)
+
+2.13  Nov 17 2004
+  - Fixed bug where NoIndent broke KeyAttr (reported by David Haas)
+  - Added copy_hash helper method which may be overridden to avoid
+    tied hashes becoming untied during XMLout (patch from Jan Sundberg)
+  - Fixed bug where GroupTags corrupted source hashref in XMLout
+    (reported by Bram)
+  - Tweaks to SuppressEmpty for undef with XMLout (report from jamesb),
+    behaviour now matches docs and additional behaviour of setting
+    option to 1 will skip undefined values altogether
+
+2.12  Apr 05 2004
+  - added NumericEscape option
+  - added ValueAttr option (patch from Anton Berezin)
+  - suppress 'wide character in print' warning (reported by Dawei Lin)
+
+2.11  Mar 02 2004
+  - Fixed hash ordering assumption in a new test (reported by Jost Krieger)
+
+2.10  Feb 29 2004
+  - Added AttrIndent option (patch from Volker Moell)
+  - Hash keys are now sorted alphabetically by default; enable the
+    new NoSort option if you don't want this (patch from Volker Moell)
+  - Fixed bug where disabling array folding broke anonymous array handling
+  - Fixed bug when unfolding a tied hash
+  - SuppressEmpty patch from Douglas Wilson
+  - Numerous test improvements - Devel::Cover rocks!
+  - POD update re XMLin(XMLout($data)) caveats (bug report from Slaven
+    Rezic)
+
+2.09  Sep 09 2003
+  - Makefile.PL makeover contributed by Joshua Keroes
+  - fixed hash ordering assumption in test script (reported by Michel
+    Rodriguez)
+  - POD updates
+  - updated link to Perl XML FAQ
+
+2.08  Jun 13 2003
+  - fixed variable expansion not happening in attributes (patch from Paul
+    Bussé)
+
+2.07  May 20 2003
+  - added test to catch old versions of Storable which lack locking support
+  - removed new-style loop which broke on 5.005_03
+  - suppress more uninitialised variable warnings
+
+2.06  May 18 2003
+  - fixed strict mode requiring ForceArray on output (fix from Igor Román
+    Mariño)
+  - fixed warnings about uninitialised values
+  - minor POD update (link to FAQ)
+
+2.05  Apr 16 2003
+  - fixed warnings when NormaliseSpace undefined (reported by Peter
+    Scott and others)
+  - added support for specifying ForceArray using regular expressions
+    (patch from Jim Cromie)
+  - added check to escape_value to guard against undefined argument
+    (reported by Henrik Gemal)
+  - added NoIndent option (requested by Afroze Husain Zubairi)
+
+2.04  Apr 10 2003
+  - integrated a patch from Michel Rodriguez
+    + new facility for removing extra levels of indirection (using
+      the new 'GroupTags' option)
+    + new facility for rolling the dreaded 'content' hash up into a
+      scalar if there are no keys left after array folding (using the
+      '-' prefix mode on the ContentKey option)
+    + new facility for doing variable substitution in the XML; variables
+      can be defined in Perl (using the new 'Variables' option) or in 
+      the XML document (using the new 'VarAttr' option)
+  - added 'NormaliseSpace' option for tidying up hash keys and other
+    text content if required (feature requested by Alex Manoussakis)
+  - option names are now case-insensitive and can include underscores
+  - XMLin() and XMLout() are now aliased to xml_in() and xml_out() when
+    called as methods or imported explicitly
+  - option names passed to XML::Simple->new() are now validated
+
+2.03  Jan 20 2003
+  - fixed circular reference check which was incorrectly catching
+    'parallel' references (patch from Theo Lengyel)
+
+2.02  Dec 15 2002
+  - changed Storable calls to use locking (reported by Randal Schwarz)
+
+2.01  Dec 11 2002
+  - fixed bug whereby :strict mode required forcearray on 
+    XMLout() (reported by Ville Skytta)
+
+2.00  Dec 08 2002
+  - first production release with SAX support
+  - added support for 'strict mode' using :strict import tag
+  - removed locking code (as it was incompatible with iThreads)
+  - integrated patch for test failures from Sean Campbell
+  - fixed stringification of references during folding (reported
+    by Trond Michelsen)
+  - fixed incompatability with Tie::IxHash (reported by
+    Venkataramana Mokkapati)
+  - POD: alphabetised options (patch from John Borwick)
+  - POD: updated suppressempty (patch from Kjetil Kjernsmo)
+  - added FAQ.pod to distribution and added new questions
+
+1.08_01 Feb 14 2002 - beta release for testing SAX support
+  - fixed errors with default namespace handling
+  - minor POD updates
+
+1.08  Feb 09 2002
+  - re-release of 1.06 (stable) with minor updates ...
+  - searchpath option now defaults to current directory if not set
+  - fix to Storable test routine for test failures on Win32
+  - removed obselete 'convert' script from distribution
+
+1.07b Feb 05 2002 - beta release for testing SAX support
+  - added SAX support including:
+    + using SAX parsers
+    + acting as a SAX handler 
+    + generating SAX events from XMLout() with new Handler option
+    + acting as a SAX filter (via new DataHandler option)
+  - added $ENV{XML_SIMPLE_PREFERRED_PARSER} and
+    $XML::Simple::PREFERRED_PARSER for selecting a parser module
+  - added namespace support (SAX only) with nsexpand option for both 
+    XMLin() and XMLout()
+  - searchpath now defaults to current directory
+  - parseropts option now officially deprecated
+  - removed obselete 'convert' script from distribution
+  - many POD updates (more to come)
+
+1.06  Nov 19 2001
+  - fixed version number in default xmldecl (thanks to Matt Sergeant for
+    bug report and patch)
+  - updated contact email address for author
+
+
+1.05  Aug 31 2000
+  - code re-org to make internals all OO for easier extending
+  - added 'noattr' option to tell XMLout() not to use attributes (only
+    nested elements) and XMLin() to discard attributes
+  - added 'suppressempty' option to tell XMLin what to do with elements
+    with no attributes and no content
+  - added 'parseropts' option for specifying options which should be
+    passed to the underlying XML::Parser object
+  - added 'forcecontent' option to force text content to parse to a
+    hash value even if the element has no attributes
+  - fix for forcearray getting applied to text content
+  - integrated patch from Paul Lindner to work around filenames sometimes
+    being seen as XML when running under mod_perl
+  - integrated patch from Edward Avis: filename '-' means stdin
+  - fixed bug where a missing key attribute could cause a crash
+  - added a warning message for above situation
+  - added 'support' for CDATA sections - they always worked, but now
+    they're in the test suite which should ensure they keep working
+  - fixed error message when caching enabled but parsing from filehandle
+  - fixed empty elements being skipped by XMLout() when folding enabled
+  - fixed text content of '0' being skipped by XMLout()
+
+1.04  Apr 03 2000
+  - fix for text content being skipped by XMLout
+  - added (optional) OO interface for changing default options
+  - added 'keeproot' option (requested by Mark D. Anderson - MDA)
+  - added 'contentkey' option (also requested by MDA)
+  - incorporated 'forcearray' as arrayref patch from Andrew McNaughton
+
+1.03  Mar 05 2000
+  - added 'maketest' script for make impaired platforms
+  - yet more cross platform robustness added to test scripts incl
+    workaround for Win32 problem where writing to file changed contents
+    but not timestamp(!)
+  - backed out one overzealous use of File::Spec in test script
+  - POD updates including XML::Twig description contributed by Michel
+    Rodriguez
+
+1.02b Feb 16 2000 - limited distribution beta
+  - reinstated locking with new backwards compatibility code
+  - fixed platform dependant pathname handling to use File::Basename &
+    File::Spec in XML::Simple.pm and test scripts
+  - fixed bug causing XMLout() to incorrectly barf on what it thought was
+    a recursive data structure
+  - removed spurious checking code which stopped XMLout unfolding a
+    single nested hash
+  - fixed t/4_MemShare.t to gracefully cope with the absense of utime()
+  - changed t/3_Storable.t and t/5_MemCopy.t to skip gracefully if no
+    Storable.pm
+  - removed superflous eval blocks around requires
+
+1.01  Dec  1 1999
+  - removed faulty locking code pending a fix
+
+1.00  Nov 25 1999
+  - added escaping feature + noescape option
+  - added xmldecl option
+  - further tidy ups for thread safing
+  - more POD revisions (incl: pointers to other modules)
+
+0.95  Nov  2 1999
+  - added rootname option
+  - added outputfile option
+  - lots of internal tidy ups for thread safing
+  - fixed bug in check for XML string to XMLin()
+  - extra tests (esp option handling)
+
+0.90  Oct 14 1999 (first beta release)
+  - module renamed to XML::Simple ready for CPAN upload
+  - XMLToOpt() renamed to XMLin()
+  - OptToXML() renamed to XMLout()
+  - added 'convert' script
+
+0.05  Sep 18 1999
+  - fixed location of XML.pm in distribution (make install didn't work)
+  - added tests for MemCopy
+  - fixed ABSTRACT_FROM in Makefile.PL
+  - fixed PREREQ_PM in Makefile.PL
+
+0.04  Aug 10 1999
+  - added caching using Storable.pm
+  - updated MANIFEST to include missing test files
+
+0.03  Jun 20 1999
+  - rewrite of OptToXML
+  - anonymous array support
+  - more and better test routines
+  - POD updates
+
+0.02  Jun 10 1999
+  - added support for OptToXML
+  - fixed searchpath inconsistencies
+  - added 'forcearray' option
+  - POD improvements
+  - much improved test routines
+
+0.01  May 27 1999
+  - original version; created by h2xs 1.18
+  - module called 'Getopt::XML'
+  - included basic XMLToOpt routine
+