Revision history for Perl extension XML::Parser.

2.48 2026-03-18 (by Todd Rinaldo)

  Fixes:
    - GH #39 Fix off-by-one heap buffer overflow in st_serial_stack growth check (CVE-2006-10003)
    - GH #64 Fix buffer overflow in parse_stream when filehandle has :utf8 layer (CVE-2006-10002)
    - GH #27 Prevent symbol table auto-vivification in Expat::parse
    - GH #30 Set UTF-8 flag on sysid in ExternEnt handler and fix Debug style for non-ASCII chars
    - GH #36 Prevent position overflow for large files in line/column/error paths
    - GH #41 Fix xml_escape to escape all occurrences of quote characters
    - GH #44 Fix lexical filehandle handling in ExternEnt handler return values
    - GH #45 Clean up compiler warnings in Expat.xs
    - GH #47 Fix routing of character data after root element to Char handler
    - GH #48 Fix current_byte overflow for large XML files on 32-bit perl
    - GH #50 Propagate xpcroak errors in Subs style instead of swallowing them
    - GH #53 Fix parameter entity references in internal DTD subset breaking handler dispatch
    - GH #65 Support standard LIBS and INC options in Makefile.PL; propagate to Expat/Makefile.PL
    - GH #69 Auto-detect multiarch library paths for expat
    - GH #72 Localize $_ in Style::Stream to avoid read-only modification
    - GH #76 Use system tmpdir for temp files in Devel::CheckLib
    - GH #83 Use pkg-config to auto-detect expat in non-standard locations
    - GH #90 Improve "Couldn't find your C compiler" error message
    - GH #100 Clean up MSVC assertlib .obj files on Windows
    - GH #103 Skip -rpath on Mac OS X 10.4 and earlier
    - GH #106 Fix freeing of the content model using XML_FreeContentModel
    - GH #148 XML-escape attribute values in Stream style default output
    - GH #149 Restore Base after parsefile() to prevent context pollution on reuse
    - GH #152 Fix SYNOPSIS handler name Characters -> Text in Stream.pm
    - GH #153 Fix variable interpolation in xpcarp() and setHandlers() error messages
    - GH #157 Restore Perl 5.8 and 5.10 test compatibility
    - GH #160 Initialize st_serial_stacksize after allocation in Expat.xs
    - GH #162 Replace local $^W=0 with no warnings 'numeric' in Expat.pm
    - GH #164 Add missing ENTER/SAVETMPS scope to notationDecl callback
    - GH #165 Replace each() with keys() to avoid iterator side effects
    - GH #166 Remove no-op study() call in xml_escape

  Improvements:
    - GH #38 Add G_VOID flag to all void-context perl_call_sv/method/pv calls
    - GH #46 Add UseForeignDTD option for documents without DOCTYPE
    - GH #49 Add current_length method to XML::Parser::Expat
    - GH #54 Add hint about unescaped characters for invalid token errors
    - GH #67 Add NoLWP to expat capability probes for consistent skip logic
    - GH #70 Enhance parse exceptions with XML context when ErrorContext is set
    - GH #71 Move encoding maps from PERL5LIB to File::ShareDir
    - GH #73 XMLDecl handler now returns "yes"/"no" for standalone attribute
    - GH #101 Make LWP::UserAgent a recommended dependency, not required
    - GH #102 Expose expat security APIs: BillionLaughs and ReparseDeferral
    - GH #167 Modernize Perl pragmas across modules

  Documentation:
    - GH #55 Add ERROR HANDLING section and improve parse error documentation
    - GH #56 Clarify Char handler splitting behavior with example and docs
    - GH #74 Document predefined entity expansion in Tree style
    - GH #161 Fix Standalone parameter description in README

  Maintenance:
    - GH #25 Add Debug style multibyte character regression test
    - GH #28 Add tests for globref and lexical filehandle return values in ExternEnt handler
    - GH #31 Add encoding tests for windows-1251, koi8-r, windows-1255, and ibm866
    - GH #51 Skip external DTD tests when expat lacks parameter entity support
    - GH #150 Replace Artistic-2.0 LICENSE with correct Perl dual license
    - GH #151 Modernize xpcroak.t from Test.pm to Test::More
    - GH #155 Modernize CI workflow inspired by YAML-Syck
    - GH #159 Install libexpat1-dev in perl-tester CI containers
    - GH #163 Replace defunct Travis CI badge with GitHub Actions
    - GH #168 Update META_MERGE URLs to cpan-authors organization
    - Integrate Windows into overall CI test run

2.47 2023-12-28 (by Todd Rinaldo)
    - #84 use $fh instead of $foo
	- #85 Fix typo in documentation
	- #89 Devel::CheckLib to from 0.99 -> 1.14
	- Devel::CheckLibn 1.16
	- #91 POD fix for verbatim text
	- #97 Add a LICENSE file
	- #94 Don't ship Expat/Makefile
	- Various github workflow improvements. Windows is still not working.

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
