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Revision history for Perl extension XML::Parser. 2.46 2019-09-24 (by Todd Rinaldo) - use foreach not for for loops - produce README.md so travis will show up on github - remove use vars and switch to our. - travis-ci testing from 5.8..5.28 - Convert XML::Parser to use 3 arg opens with no barewords. - Migrate tracker to github - Switch to XSLoader - Fix a buffer overwrite in parse_stream() 2.44 2015-01-12 (by Todd Rinaldo) - RT 99098 - Revert "Add more useful error message on parse to Expat". It breaks XML::Twig. Calling code will need to do this if it's needed. - RT 100959 - Add use FileHandle to t/astress.t - Make perl 5.10.0 happy. 2.43 2014-12-11 (by Todd Rinaldo) - POD patch to man from Debian via Nicholas Bamber - POD patch from Debian via gregor herrmann. - Add more useful error message on parse to Expat - Fix LWP dependency to be LWP::Useragent - Bump to 2.43 for overdue release to CPAN. 2.42_01 2013-07-12 (by Todd Rinaldo) - Added instructions to README for OSX - XS changes: stop using SvPV(string, PL_na) - Fix documentation typos 2.41 2011-06-01 (by Todd Rinaldo) - Tests are cleaned. promoting to stable. No changes since 2.40_02 2.40_02 2011-05-31 (by Todd Rinaldo) - TODO some tests which fail in Free BSD due to improper expat CVE patch http://www.freebsd.org/cgi/query-pr.cgi?pr=157469 2.40_01 2011-05-24 (by Todd Rinaldo) - better installation instructions - Small spelling patches from Debian package - Thanks Nicholas Bamber - RT 68399 - Upgrade Devel::CheckLib to 0.93 to make it perl 5.14 compliant - qw() - RT 67207 - Stop doing tied on globs - Thanks sprout - RT 31319 - Fix doc links in POD for XML/Parser.pm 2.40 2010-09-16 (by Alexandr Ciornii) - Add windows-1251.enc, ibm866.enc, koi8-r.enc (Russian) - Add windows-1255.enc (Hebrew) - Update iso-8859-7.enc (RT#40712) - Use Devel::CheckLib - Better description of expat packages - Better Perl style in both code and docs 2.36 - Fix for Carp::Heavy bugs 2.35 (mostly by Alexandr Ciornii) - Works in 5.10 (Andreas J. Koenig) - Added license in Makefile.PL (Alexandr Ciornii) - Makefile.PL also searches for expat in C:/lib/Expat-2.0.0 (Alexandr Ciornii) - No longer uses variable named 'namespace' in Expat.xs (Jeff Hunter) 2.33 - Fixed Tree style (grantm) - Fixed some non-utf8 stuff in DTDs (patch in XML::DOM tarball) 2.32 - Memory leak fix (Juerd Waalboer). - Added windows-1252 encoding - Styles moved to separate .pm files to make loading faster and ease maintainence - Don't load IO::Handle unless we really need to 2.31 Tue Apr 2 13:39:51 EST 2002 - Ilya Zakharevich <ilya@math.ohio-state.edu> and Dave Mitchell <davem@fdgroup.com> both provided patches to fix problems module had with 5.8.0 - Dave Mitchell also made some UTF-8 related fixes to the test suite. 2.30 Thu Oct 5 12:47:36 EDT 2000 - Get rid of ContentStash global. Not that big a deal looking it up everytime and gets rid of a potential threading problem. - Switch to shareable library version of expat from sourceforge (i.e. no longer include expat source and require that libexpat be installed) - Bob Tribit <btribit@traffic.com> demonstrated a fix for problems in compiling under perl 5.6.0 with 5.005 threading. - Matt Sergeant <matt@sergeant.org> discovered a typo ('IO::Handler' instead of 'IO::Handle') in Expat.pm that caused IO::Handle objects to be treated as strings instead of handles. - Matt Sergeant also provided a patch to allow tied handles to work properly in calls to parse. - Eric Bohlman <ebohlman@netcom.com> reported a failure when incremental parsing and external parsing were used together. Need to give explicit package when calling Do_External_Parse from externalEntityRef otherwise fails when called through ExpatNB. 2.29 Sun May 21 21:19:45 EDT 2000 - In expat, notation declaration handler registration wasn't surviving through external entity references. - Chase Tingley <tingley@sundell.net> discovered that text accumulation in the Stream style wasn't working across processing instructions and recommended the appropriate fix. - Jochen Wiedmann <jochen.wiedmann@softwareag.com>, noted that you couldn't use ExpatNB directly because it wasn't setting the protective _State_ variable. Now doing this in the parse_more method of ExpatNB. - At the suggestion of Grant Hopwood <hopwoodg@valero.com>, now calling the env_proxy method on the LWP::UserAgent in the LWP external entity handler when it's created to set any proxies from environment variables. - Grant McLean, Matt Sergeant (& others I may have missed) noted that loading the LWP & URI modules slowed startup of the module, even if the application didn't need it. The default LWP handler is now dynamicly loaded (along with LWP & URI modules) the first time an external entity is referenced. Also provided a NoLWP option to XML::Parser that forces the file based external entity handler. - Fixed allocation errors in element declaration patches in expat - The Expat base method now works, even before expat starts parsing. - Changed the canonical script to take an optional file argument. - Enno Derksen <enno@att.com> reported that the attlist handler was not returning NOTATION type attlist information. - Michel Rodriguez <mrodrigu@ieee.org>, noted that the constructor for XML::Parser objects no longer checked for the existence of applications installed external entity handlers before installing the default ones. - Burkhard Meier <burkhard.meier@ixos.de> sent in a fix for compiler directives in Expat/Makefile.PL for Win32 machines. A change in 5.6.0 caused the old conditional to fail. - Forgot to document changes to the Entity declaration handler: there is an additional "IsParam" argument that indicates whether or not the entity is a parameter entity. This information is no longer passed on in the name. - Ben Low <ben@snrc.uow.edu.au> reported an undefined macro with version 5.004_04. 2.28 Mon Mar 27 21:21:50 EST 2000 - Junked local (Expat.xs) declaration parsing and patched expat to handle XML declarations, element declarations, attlist declarations, and all entity declarations. By eliminating both shadow buffers and local declaration parsing in Expat.xs, I've eliminated the two most common sources of serious bugs in the expat interface. o thus fixed the segfault and parse position bugs reported by Ivan Kurmanov <iku@fnmail.com> o and the doctype bug reported by Kevin Lund <Kevin.Lund@westgroup.com> o The element declaration handler no longer receives a string, but an XML::Parser::ContentModel object that represents the parsed model, but still looks like a string if referred to as a string. This class is documented in the XML::Parser::Expat pod under "XML::Parser::ContentModel Methods". o The doctype declaration handler no longer receives the internal subset as a string, but in its place a true or undef value indicating whether or not there is an internal subset. Also, it's called prior to processing either the internal or external DTD subset (as suggested by Enno Derksen <enno@att.com>.) o There is a new DoctypeFin handler that's called after finishing parsing all of the DOCTYPE declaration, including any internal or external DTD declarations. o One bit of lossage is that recognized_string, original_string, and default_current no longer work inside declaration handlers. - Added a handler that gets called after parsing external entities: ExternEntFin. Suggested by Jeff Horner <jhorner@netcentral.net>. - parsefile, file_ext_ent_handler, & lwp_ext_ent_handler now all set the base path. This problem has been raised more than once and I'm not sure to whom credit should be given. - The file_ext_ent_handler now opens a file handle instead of reading the entire entity at once. - Merged patches supplied by Larry Wall to (for perl 5.6 and beyond) tag generated strings as UTF-8, where appropriate. - Fixed a bug in xml_escape reported by Jerry Geiger <jgeiger@rios.de>. It failed when requesting escaping of perl regex meta-characters. - Laurent Caprani <caprani@pop.multimania.com> reported a bug in the Proc handler for the Debug style. - <chocolateboy@usa.net> sent in a patch for the element index mechanism. I was popping the stack too soon in the endElement fcn. - Jim Miner <jfm@winternet.com> sent in a patch to fix a warning in Expat.pm. - Kurt Starsinic pointed out that the eval used to check for string versus IO handle was leaving $@ dirty, thereby foiling higher level exception handlers - An expat question by Paul Prescod <paul@prescod.net> helped me see that exeptions in the parse call bypass the Expat release method, causing memory leaks. - Mark D. Anderson <mda@discerning.com> noted that calling recognized_string from the Final method caused a dump. There are a bunch of methods that should not be called after parsing has finished. These now have protective if statements around them. - Updated canonical utility to conform to newer version of Canonical XML working draft. 2.27 Sat Sep 25 18:26:44 EDT 1999 - Corrected documentation in Parser.pm - Deal with XML_NS and XML_BYTE_ORDER macros in Expat/Makefile.PL - Chris Thorman <chris@thorman.com> noted that "require 'URI::URL.pm'" in Parser.pm was in error (should be "require 'URI/URL.pm'") - Andrew McNaughton <andrew@scoop.co.nz> noted "use English" and use of '$&' slowed down regex handling for whole application, so they were excised from XML::Parser::Expat. - Work around "modification of read-only value" bug in perl 5.004 - Enno Derksen <enno@att.com> reported that the Doctype handler wasn't being called when ParseParamEnt was set. - Now using Version 19990728 of expat, with local patches. - Got rid of shadow buffer o thus fixed the error reported by Ashley Sanders <a.sanders@mcc.ac.uk> o and removed ExpatNB limitations that Peter Billam <music@pjb.com.au> noted. - Vadim Konovalov <vkonovalov@lucent.com> had a problem compiling for multi-threading that was fixed by changing Perl_sv_setsv to sv_setsv. - Added new Expat method: skip_until(index) - Backward incompatible change to method xml_escape: to get former behavior use $xp->xml_escape($string, '>', ...) - Added utility, canonical, to samples 2.26 Sun Jul 25 19:06:41 EDT 1999 - Ken Beesley <ken.beesley@xrce.xerox.com> discovered that declarations in the external subset are not sent to registered handlers when there is no internal subset. - Fixed parse_dtd to work when entity values or attribute defaults are so large that they might be broken across multiple calls to the default handler. - For lwp_ext_ent_handler, use URI::URL instead of URI so that old 5.004 installations will work with it. 2.25 Fri Jul 23 06:23:43 EDT 1999 - Now using Version 1990709 of expat. No local patches. - Numerous people reported a SEGV problem when running t/cdata on various platforms and versions of perl. The problem was introduced with the setHandlers change. In some cases an un-initialized value was being returned. - Added an additional external entity handler, lwp_ext_ent_handler, that deals with general URIs. It is installed instead of the "file only" handler if the LWP package is installed. 2.24 Thu Jul 8 23:05:50 EDT 1999 - KangChan Lee <dolphin@comeng.chungnam.ac.kr> supplied the EUC-KR encoding map. - Enno Derksen <enno@att.com> forwarded reports by Jon Eisenzopf <eisen@pobox.com> and Stefaan Onderbeke <onderbes@bec.bel.alcatel.be> about a core dump using XML::DOM. This was due to a bug in the prolog parsing part of XML::Parser. - Loic Dachary <loic@ceic.com> discovered that changing G_DISCARD to G_VOID introduced a small memory leak. Changed G_VOID back to G_DISCARD. - As suggested by Ben Holzman <bholzman@earthlink.net>, the setHandlers methods of both Parser and Expat now return lists that consist of type, handler pairs that correspond to the input, but the handlers returned are the ones that were in effect prior to the call. - Now using Version 19990626 of expat with a local patch (provided by James Clark.) - Added option ParseParamEnt. When set to a true value, parameter entities are parsed and the external DTD is read (unless standalone set to "Yes" in document). 2.23 Mon Apr 26 21:30:28 EDT 1999 - Fixed a bug in the ExpatNB class reported by Gabe Beged-Dov <begeddov@jfinity.com>. The ErrorMessage attribute wasn't being initialized for ExpatNB. This should have been done in the Expat constructor. - Applied patch provided by Nathan Kurz <nate@valleytel.net> to fix more perl stack manipulation errors in Expat.xs. - Applied another patch by Nathan to change perl_call_sv flag from G_DISCARD to G_VOID for callbacks, which helps performance. - Murata Makoto <murata@apsdc.ksp.fujixerox.co.jp> reported a problem on Win32 platforms that only showed up when UTF-16 was being used. The needed call to binmode was added to the parsefile methods. - Added documentation for release method that was added in release 2.20 to Expat pod. (Point raised by <mookie@undef.com>) - Now using Version 19990425 of expat. No local patches. - Added specified_attr method and made ineffective the is_defaulted method. 2.22 Sun Apr 4 11:47:25 EDT 1999 - Loic Dachary <loic@ceic.com> reported a core dump with a small file with a comment that wasn't properly closed. Fixed in expat by updating positionPtr properly in final call of XML_Parse. (Reported to & acknowledged by James Clark.) - Made more fixes to Expat.xs position calculation. - Loic Dachary <loic@ceic.com> provided patches for fixing a memory growth problem with large documents. (Garbage collection wasn't happening frequently enough.) - As suggested by Gabe Beged-Dov <begeddov@jfinity.com>, added a non-blocking parse mechanism: - Added parse_start method to XML::Parser, which returns a XML::Parser::ExpatNB object. - Added XML::Parser::ExpatNB class, which is a subclass of Expat and has the additional methods parse_more & parse_done - Made some performance tweaks as suggested by performance thread on perl-xml discussion list. [With negligible results] - Tried to clarify Tree style structure in Parser pod 2.21 Sun Mar 21 17:42:04 EST 1999 - Warren Vik <wvik@whitebarn.com> provided patches for a bug introduced with the is_defaulted method. It manifested itself by bogusly reporting duplicate attributes. - Now using latest expat from ftp://ftp.jclark.com/pub/test/expat.zip, Version 19990307. (Plus any patches in Expat/expat.patches.) - As suggested by Tim Bray, added an xml_escape method to Expat. - Murray Nesbitt <murray@activestate.com> had build problems on Win32 that were solved by swapping 2 include files in Expat.xs - Added following Expat namespace methods: new_ns_prefixes expand_ns_prefix current_ns_prefixes - Fixed memory handling in recognized_string method to get rid of "Attempt to free unreferenced scalar" bug. 2.20 Sun Feb 28 15:35:52 EST 1999 - Fixed miscellaneous bugs in xmlfilter. - In the default external entity handler, prepend the base only for relative URLs. - Chris Nandor <pudge@pobox.com> provided patches for building on Macintosh. - As suggested by Matt Sergeant <Matthew.Sergeant@eml.ericsson.se>, added the finish method to Expat. - Matt also provided a fix to a bug he discovered in the Streams style. - Fixed a parse position bug reported by Enno Derksen <enno@att.com> that was affecting both original_string and position_in_context. - Fixed a gross memory leak reported by David Megginson, <david@megginson.com>: there was a circular reference to the Expat object and the internal end handler for context was not freeing element names after they were removed from the context stack. - Now using expat Version 19990109 (Plus any patches in Expat/expat.patches) - Added is_defaulted method to Expat to tell if an attribute was defaulted. (Requested by Enno Derksen for XML::DOM.) - Matt Sergeant <Matthew.Sergeant@eml.ericcson.se> reported that the XML::Parser parse methods weren't propagating array context to the Final handler. Now they are. - Fixed more memory leaks (again reported by David Megginson). The SVs pointing to the handlers weren't being reclaimed when the callback vector was freed. - Added the element_index method to Expat. 2.19 Sun Jan 3 11:23:45 EST 1999 - When the recognized string is long enough, expat uses multiple calls to reportDefault. Fixed recString handler in Expat.xs to deal with this properly. - Added original_string method to Expat. This returns the untranslated string (i.e. original encoding) that caused current event. - Alberto Accomazzi <alberto@cfa0.harvard.edu> sent in more patches for perl5.005_54 incompatibilities. - Alberto also fingered a nasty memory bug in Expat.xs that arose sometimes when you registered a declaration handler but no default handler. It would give you a "Not a CODE reference" error in a place that wasn't using any CODE references. - <schinder@pobox.com> reported a problem with compiling expat on a Sun 4 due to non-exsitance of memmove on that OS. Provided a workaround in Makefile.PL - Now using expat Version 19981231 from James Clark's test directory. - Made patch to this version in order to support original_string (see Expat/expat.patches.) - Added CdataStart and CdataEnd handlers to expat. 2.18 Sun Dec 27 07:39:23 EST 1998 - Alberto Accomazzi <alberto@cfa0.harvard.edu> pointed out that the DESTROY sub in the new XML::Parser::Encinfo package was pointing to the wrong package for calling FreeEncoding. - Tarang Kumar Patel <mombasa@ptolemy.arc.nasa.gov> reported the mis-declaration of an integer as unsigned in the convert_to_unicode function in Expat.xs. - Glenn R. Kronschnabl <grk@arlut.utexas.edu> reported a problem with ExternEnt handlers when using parsefile. Turned out to be an unmatched ENTER; SAVETMPS pair that screwed up the Perl stack. - Tom Hughes <tom@compton.demon.co.uk> reported that the fix I put in for the swith to PL_sv.. names failed with 5.0005_54, since these became real variables instead of macros. Switched to just checking the PATCHLEVEL macro. - Yoshida Masato <yoshidam@inse.co.jp> provided the EUC-JP encodings (the corresponding XML files are in XML::Encoding 1.01 or later.) - With the advice of MURATA Makoto <murata@apsdc.ksp.fujixerox.co.jp>, removed the Shift_JIS encoding and replaced it with 4 variations he provided. He also provided an explanatory message. - Added the recognized_string method to Expat, deprecating default_current. - Now using expat Version 19981122 from James Clark's test directory (this fixes another bug with external entity reference handlers) - Added a default external entity handler that only accesses file: based URLs. 2.17 Sun Dec 13 17:39:58 EST 1998 - Replaced uses of malloc, realloc, and free with New, Renew, and Safefree respectively - In Expat.pm, fixed methods in_element and within_element to work correctly with namespaces. - xmlfilter - Substitute quoted equivalents for special characters in attribute values. - position_in_context was off by one line when position was at the end of line. - For the context methods in Expat.pm, do the right thing when the context list is empty. - Added methods xpcroak and xpcarp to Expat. - Alberto Accomazzi <alberto@cfa0.harvard.edu> noted that perl releases 5.005_5* (the pre 5.006 development versions) won't accept sv_undef (and related constants) anymore and we have to switch to PL_sv_... - Alberto also reported a warning in the newer versions of IO::Handle about input_record_separator not being treated on a per-handle basis. - Fixed bug that Jon Udell <udell@top.monad.net> reported in Stream style: Text handler most of the time didn't see proper context. - Added XML::Parser::Expat::load_encoding function and support for external encodings. 2.16 Tue Oct 27 22:27:33 EST 1998 - Fixed bug reported by Enno Derksen <enno@att.com>: Now treats parameter entity declarations correctly. The entity handler sees the name beginning with '%' if it's a parameter entity declaration. - Nigel Hutchison <nwoh@software-ag.de> pointed out that stream.t wasn't portable off Unix systems. Replaced with portable version. - Fixed bug reported by Enno Derksen <enno@att.com>: XML Declaration was firing off both XMLDecl handler *and* Default handler. - Added option NoExpand to Expat to turn off expansion of entity references when a default handler is set. 2.15 Tue Oct 20 14:50:11 EDT 1998 - In Expat's parse method, account for undefined previous record separators. - Simplify a couple of Expat methods. - Re-ordered Changes entries to put latest changes first. - In XML::Parser::new, set Handlers if not already set - New Handler (XMLDecl) for handling XML declarations - New Handler (Doctype) for handling DOCTYPE declarations - New Handler (Entity) for handling ENTITY declarations in the internal subset. - New Handler (Element) for handling ELEMENT declarations in the internal subset. - New Handler (Attlist) for handling ATTLIST declarations in the internal subset. - Documented new handlers - Added t/decl.t to test new handlers 2.14 Sun Oct 11 22:17:15 EDT 1998 - Always use method calls for streams. - Use perl's input_record_separator to find delimiter (i.e. each "line" is an entire XML doc with delimiter appended) - Deal with line being longer than buffer. 2.13 Thu Oct 8 16:58:39 EDT 1998 - Fixed a major oops in Expat.xs where I was trying to decrement a refcnt on an unallocated SV, leading to a segment violation. (Why did this show up on HPUX but not Linux?) 2.12 Thu Oct 8 00:05:10 EDT 1998 - Incorporated fix to t/astress.t from <fletch@phydeaux.org> (Mike Fletcher). - Change to xmlstats from <dblack@candle.superlink.net> (David Alan Black) - Access Handlers_Setters in Expat and Handler_Types in Parser through object reference (following admonition in perltoot about class data.) - Added Stream_Delimiter option to Expat. - In the parse_stream function in Expat.xs, if we either have a Stream_Delimiter or if there's no file descriptor, use method calls instead. For Stream_Delimiter in particular, the function now uses the getline method so it can check for the delimiter without consuming stuff past the delimiter from the stream. 2.11 Sun Oct 4 22:15:53 EDT 1998 - Swapped out local patch for expat and swapped in James Clark's patch. - Pass on all Parser attributes (other than those excluded by Non_Expat_Options) to the instance of Expat created at parse time. - New method for Expat: generate_ns_name - Split test.pl into t/*.t and change Makefile.PL so we don't do a useless descent into Expat subdir for testing. - Stop the numeric warning for eq_name and namespace method. 2.10 Fri Sep 25 18:36:46 EDT 1998 - Uses expat Version 19980924 (with local patch - see Expat/expat/xmlparse/xmlparse.c.diff) - Use newSVpvn when PERL_VERSION >= 5.005 - Completed xmlfilter - Added support for namespace processing: o Namespaces option to XML::Parser and XML::Parser::Expat o Two new methods in Expat: namespace - to return namespace associated with name eq_name - compare 2 names for equality across namespaces. - Use expat's new SetDefaultHandlerExpand instead of SetDefaultHandler so that entity expansion may continue even if the default handler is set. - Moved test.pl back up main level and changed to work with XML::Parser - Added tests for namespaces 2.09 Fri Sep 18 10:33:38 EDT 1998 - Fixed errors that caused -w to fret in XML::Parser. - Fixed depth method in XML::Parser::Expat - There were a few places in Expat.xs where garbage strings may have been returned due to the expat library giving us zero-length strings. Fixed by using a local version of newSVpv where length means length, even when zero. - The default handler setter in Expat.xs, was inappropriately setting cbv->dflt_sv when there was a null handler. 2.08 Thu Sep 17 11:47:13 EDT 1998 - Make XML::Parser higher-level re-usable parser objects. Old object now becomes XML::Parser::Expat. - The XML::Parser object now supports the style mechanism very close to that in the 1.0 version. 2.07 Wed Sep 9 11:03:43 EDT 1998 - Added some samples (xmlcomments & xmlstats) - Now requires 5.004 (due to sv_catpvf) - Changed Makefile.PL to allow automatic manification - Added a test that reads xml spec (to check buffer boundary errors) 2.06 Tue Sep 1 10:40:41 EDT 1998 - Fixed the methods current_line, current_byte, and current_column - Added some tests 2.05 Mon Aug 31 15:29:42 EDT 1998 - Made Makefile.PL changes suggested by Murray Nesbitt <murray@ActiveState.com> to support building on Win32 and for making PPM binaries. - Added method parse - Changed parsestring and parsefile to use new parse method - Deprecated parsestring method - Improved error handling in the ExternEnt handler 2.04 Wed Aug 26 13:25:01 EDT 1998 - Uses expat Version 1.0 of August 14, 1998 - Some document changes - Changed dist section in Makefile.PL - Added ExternEnt handler - Added tests for ExternEnt 2.03 Fri Aug 21 17:19:26 EDT 1998 - Changed InitEncoding to ProtocolEncoding. Default to none. Pass null string to expat's ParserCreate when there is no ProtocolEncoding. - Fixed bug in parsefile & parsestring where they were referring to an ErrorContext *method* instead of a field. - Fixed position_in_context bugs: -- 'last' in do {} while (); -- insert newline before pointer when no following newline in buffer. - Added some additional tests 2.02 Thu Aug 20 14:05:08 EDT 1998 - Fixed parsefile problem reported by "Robert Hanson" <robertha@zenweb.com>, using a modification of his suggested fix. - Responded to problem reported by Bart Schuller <schuller+perl-xml@lunatech.com> by pre-expanding parts of the XML_UPD macro to avoid confusing some versions of gcc. - Changed the constructor to take the option InitEncoding, which gets passed to the ParserCreate call. When not given, defaults to UTF-8. - Added method position_in_context - Added Constructor option ErrorContext and added reporting of errors in context. 2.01 Wed Aug 19 11:42:42 EDT 1998 - Added methods: default_current, base, current_line, current_column, current_byte, context - Added some tests - parsestring and parsefile now croak if they're re-used - Filled in some documentation 2.00 Mon Aug 17 12:01:33 EDT 1998 - repackaged with James Clark's most recent expat - changed to an API closer to expat 1.00 March 1998 - Larry Wall's original version