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base/SOURCES/libxml2-Bug-759398-Heap-use...

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commit b226bfbe101b5160917bf649510c407ab997cb00
Author: Pranjal Jumde <pjumde@apple.com>
Date: Thu Mar 3 11:50:34 2016 -0800
Bug 759398: Heap use-after-free in xmlDictComputeFastKey <https://bugzilla.gnome.org/show_bug.cgi?id=759398>
* parser.c:
(xmlParseNCNameComplex): Store start position instead of a
pointer to the name since the underlying buffer may change,
resulting in a stale pointer being used.
* result/errors/759398.xml: Added.
* result/errors/759398.xml.err: Added.
* result/errors/759398.xml.str: Added.
* test/errors/759398.xml: Added test case.
diff --git a/parser.c b/parser.c
index 03bc4f8..46ab0e8 100644
--- a/parser.c
+++ b/parser.c
@@ -2008,6 +2008,7 @@ static int spacePop(xmlParserCtxtPtr ctxt) {
#define CUR (*ctxt->input->cur)
#define NXT(val) ctxt->input->cur[(val)]
#define CUR_PTR ctxt->input->cur
+#define BASE_PTR ctxt->input->base
#define CMP4( s, c1, c2, c3, c4 ) \
( ((unsigned char *) s)[ 0 ] == c1 && ((unsigned char *) s)[ 1 ] == c2 && \
@@ -3465,6 +3466,7 @@ xmlParseNCNameComplex(xmlParserCtxtPtr ctxt) {
int len = 0, l;
int c;
int count = 0;
+ size_t startPosition = 0;
#ifdef DEBUG
nbParseNCNameComplex++;
@@ -3474,6 +3476,7 @@ xmlParseNCNameComplex(xmlParserCtxtPtr ctxt) {
* Handler for more complex cases
*/
GROW;
+ startPosition = CUR_PTR - BASE_PTR;
c = CUR_CHAR(l);
if ((c == ' ') || (c == '>') || (c == '/') || /* accelerators */
(!xmlIsNameStartChar(ctxt, c) || (c == ':'))) {
@@ -3509,7 +3512,7 @@ xmlParseNCNameComplex(xmlParserCtxtPtr ctxt) {
xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NCName");
return(NULL);
}
- return(xmlDictLookup(ctxt->dict, ctxt->input->cur - len, len));
+ return(xmlDictLookup(ctxt->dict, (BASE_PTR + startPosition), len));
}
/**
diff --git a/result/errors/759398.xml b/result/errors/759398.xml
new file mode 100644
index 0000000..e69de29
diff --git a/result/errors/759398.xml.err b/result/errors/759398.xml.err
new file mode 100644
index 0000000..e08d9bf
--- /dev/null
+++ b/result/errors/759398.xml.err
@@ -0,0 +1,9 @@
+./test/errors/759398.xml:210: parser error : StartTag: invalid element name
+need to worry about parsers whi<! don't expand PErefs finding
+ ^
+./test/errors/759398.xml:309: parser error : Opening and ending tag mismatch: spec line 50 and termdef
+and provide access to their content and structure.</termdef> <termdef
+ ^
+./test/errors/759398.xml:309: parser error : Extra content at the end of the document
+and provide access to their content and structure.</termdef> <termdef
+ ^
diff --git a/result/errors/759398.xml.str b/result/errors/759398.xml.str
new file mode 100644
index 0000000..de9a28c
--- /dev/null
+++ b/result/errors/759398.xml.str
@@ -0,0 +1,5 @@
+./test/errors/759398.xml:210: parser error : internal error: detected an error in element content
+
+need to worry about parsers whi<! don't expand
+ ^
+./test/errors/759398.xml : failed to parse
diff --git a/test/errors/759398.xml b/test/errors/759398.xml
new file mode 100755
index 0000000..132e029
--- /dev/null
+++ b/test/errors/759398.xml
@@ -0,0 +1,326 @@
+<?xml version='1.0' encoding='ISO-8859-5' standalone='no'?>
+<!DOCTYPE spec SYSTEM "dtds/spec.dtd" [
+
+<!-- LAST TOUCHED BY: Tim Bray, 8 February 1997 -->
+
+<!-- The words 'FINAL EDIT' in comments mark places where changes
+need to be made after approval of the document by the ERB, before
+publication. -->
+
+<!ENTITY XML.version "1.0">
+<!ENTITY doc.date "10 February 1998">
+<!ENTITY iso6.doc.date "19980210">
+<!ENTITY w3c.doc.date "02-Feb-1998">
+<!ENTITY draft.day '10'>
+<!ENTITY draft.month 'February'>
+<!ENTITY draft.year '1998'>
+
+<!ENTITY WebSGML
+ 'WebSGML Adaptations Annex to ISO 8879'>
+
+<!ENTITY lt "<">
+<!ENTITY gt ">">
+<!ENTITY xmlpio "'&lt;?xml'">
+<!ENTITY pic "'?>'">
+<!ENTITY br "\n">
+<!ENTITY cellback '#c0d9c0'>
+<!ENTITY mdash "--"> <!-- &#x2014, but nsgmls doesn't grok hex -->
+<!ENTITY com "--">
+<!ENTITY como "--">
+<!ENTITY comc "--">
+<!ENTITY hcro "&amp;#x">
+<!-- <!ENTITY nbsp "<EFBFBD>"> -->
+<!ENTITY nbsp "&#160;">
+<!ENTITY magicents "<code>amp</code>,
+<code>lt</code>,
+<code>gt</code>,
+<code>apos</code>,
+<code>quot</code>">
+
+<!-- audience and distribution status: for use at publication time -->
+<!ENTITY doc.audience "public review and discussion">
+<!ENTITY doc.distribution "may be dislributed freely, as long as
+all text and legal notices remain intact">
+
+]>
+
+<!-- for Panorama *-->
+<?VERBATIM "eg" ?>
+
+<spec>
+<header>
+<title>Extensible Markup Language (XML) 1.0</title>
+<version></version>
+<w3c-designation>REC-xml-&iso6.doc.date;</w3c-designation>
+<w3c-doctype>W3C Recommendation</w3c-doctype>
+<pubdate><day>&draft.day;</day><month>&draft.month;</month><year>&draft.year;</year></pubdate>
+
+<publoc>
+<loc href="http://www.w3.org/TR/1998/REC-xml-&iso6.doc.date;">
+http://www.w3.org/TR/1998/REC-xml-&iso6.doc.date;</loc>
+<loc href="http://www.w3.org/TR/1998/REC-xml-&iso6.doc.date;.xml">
+http://www.w3.org/TR/1998/REC-xml-&iso6.doc.date;.xml</loc>
+<loc href="http://www.w3.org/TR/1998/REC-xml-&iso6.doc.date;.html">
+http://www.w3.org/TR/1998/REC-xml-&iso6.doc.date;.html</loc>
+<loc href="http://www.w3.org/TR/1998/REC-xml-&iso6.doc.date;.pdf">
+http://www.w3.org/TR/1998/REC-xml-&iso6.doc.date;.pdf</loc>
+<loc href="http://www.w3.org/TR/1998/REC-xml-&iso6.doc.date;.ps">
+http://www.w3.org/TR/1998/REC-xml-&iso6.doc.date;.ps</loc>
+</publoc>
+<latestloc>
+<loc href="http://www.w3.org/TR/REC-xml">
+htt<EFBFBD><EFBFBD><EFBFBD><EFBFBD>www.w3.org/TR/REC-xml</loc>
+</latestloc>
+<prevlocs>
+<loc href="http://www.w3.org/TR/PR-xml-971208">
+http://www.w3.org/TR/PR-xml-971208</loc>
+<!--
+<loc href='http://www.w3.org/TR/WD-xml-961114'>
+http://www.w3.org/TR/WD-xml-961114</loc>
+<loc href='http://www.w3.org/TR/WD-xml-lang-970331'>
+http://www.w3.org/TR/WD-xml-lang-970331</loc>
+<loc href='http://www.w3.org/TR/WD-xml-lang-970630'>
+http://www.w3.org/TR/WD-xml-lang-970630</loc>
+<loc href='http://www.w3.org/TR/WD-xml-970807'>
+http://www.w3.org/TR/WD-xml-970807</loc>
+<loc href='http://www.w3.org/TR/WD-xml-971117'>
+http://www.w3.org/TR/WD-xml-971117</loc>-->
+</prevlocs>
+<authlist>
+<author><name>Tim Bray</name>
+<affiliation>Textuality and Netscape</affiliation>
+<email
+href="mailto:tbray@textuality.com">tbray@textuality.com</email></author>
+<author><name>Jean Paoli</name>
+<affiliation>Microsoft</affiliation>
+<email href="mailto:jeanpa@microsoft.com">jeanpa@microsoft.com</email></author>
+<author><name>C. M. Sperberg-McQueen</name>
+<affiliation>University of Illinois at Chicago</affiliation>
+<email href="mailto:cmsmcq@uic.edu">cmsmcq@uic.edu</email></author>
+</authlist>
+<abstract>
+<p>The Extensible Markup Language (XML) is a subset of
+SGML that is completely described in this document. Its goal is to
+enable generic SGML to be served, received, and processed on the Web
+in the way that is now possible with HTML. XML has been designed for
+ease of implementation and for interoperability with both SGML and
+HTML.</p>
+</abstract>
+<status>
+<p>This document has been reviewed by W3C Members and
+other interested parties and has been endorsed by the
+Director as a W3C Recommendation. It is a stable
+document and may be used as reference material or cited
+as a normative reference from another document. W3C's
+role in making the Recommendation is to draw attention
+to the spPcification and to promote its widespread
+deployment. This enhances the functionality and
+interoperability of the Web.</p>
+<p>
+This document specifies a syntax created by subsetting an existing,
+widely used international text processing standard (Standard
+Generalized Markup Language, ISO 8879:1986(E) as amended and
+corrected) for use on the World Wide Web. It is a product of the W3C
+XML Activity, details of which can be found at <loc
+href='http://www.w3.org/XML'>http://www.w3.org/XML</loc>. A list of
+current W3C Recommendations and other technical documents can be found
+at <loc href='http://www.w3.org/TR'>http://www.w3.org/TR</loc>.
+</p>
+<p>This specification uses the term URI, which is defined by <bibref
+ref="Berners-Lee"/>, a work in progress expected to update <bibref
+ref="RFC1738"/> and <bibref ref="RFC1808"/>.
+</p>
+<p>The list of known errors in this specification is
+available at
+<loc href='http://www.w3.org/XML/xml-19980210-errata'>http://www.w3.org/XML/xml-19980210-errata</loc>.</p>
+<p>Please report errors in this document to
+<loc href='mailto:xml-editor@w3.org'>xml-editor@w3.org</loc>.
+</p>
+</status>
+
+
+<pubstmt>
+<p>Chicago, Vancouver, Mountain View, et al.:
+World-Wide Web Consortium, XML Working Group, 1996, 1997.</p>
+</pubstmt>
+<sourcedesc>
+<p>Created in electronic form.</p>
+</sourcedesc>
+<langusage>
+<language id='EN'>English</language>
+<language id='ebnf'>Extended Backus-Naur Form (formal grammar)</language>
+</langusage>
+<revisiondesc>
+<slist>
+<sitem>1997-12-03 : CMSMcQ : yet further changes</sitem>
+<sitem>1997-12-02 : TB : further changes (see TB to XML WG,
+2 December 1997)</sitem>
+<sitem>1997-12-02 : CMSMcQ : deal with as many corrections and
+comments from the proofreaders as possible:
+entify hard-coded document date in pubdate element,
+change expansion of entity WebSGML,
+update status description as per Dan Connolly (am not sure
+about refernece to Berners-Lee et al.),
+add 'The' to abstract as per WG decision,
+move Relationship to Existing Standards to back matter and
+combine with References,
+re-order back matter so normative appendices come first,
+re-tag back matter so informative appendices are tagged informdiv1,
+remove XXX XXX from list of 'normative' specs in prose,
+move some references from Other References to Normative References,
+add RFC 1738, 1808, and 2141 to Other References (they are not
+normative since we do not require the processor to enforce any
+rules based on them),
+add reference to 'Fielding draft' (Berners-Lee et al.),
+move notation section to end of body,
+drop URIchar non-terminal and use SkipLit instead,
+lose stray reference to defunct nonterminal 'markupdecls',
+move reference to Aho et al. into appendix (Tim's right),
+add prose note saying that hash marks and fragment identifiers are
+NOT part of the URI formally speaking, and are NOT legal in
+system identifiers (processor 'may' signal an error).
+Work through:
+Tim Bray reacting to James Clark,
+Tim Bray on his own,
+Eve Maler,
+
+NOT DONE YET:
+change binary / text to unparsed / parsed.
+handle James's suggestion about &lt; in attriubte values
+uppercase hex characters,
+namechar list,
+</sitem>
+<sitem>1997-12-01 : JB : add some column-width parameters</sitem>
+<sitem>1997-12-01 : CMSMcQ : begin round of changes to incorporate
+recent WG decisions and other corrections:
+binding sources of character encoding info (27 Aug / 3 Sept),
+correct wording of Faust quotation (restore dropped line),
+drop SDD from EncodingDecl,
+change text at version number 1.0,
+drop misleading (wrong!) sentence about ignorables and extenders,
+modify defin<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EF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with Byte Order Mark.
+Add content model as a term and clarify that it applies to both
+mixed and element content.
+</sitem>
+<sitem>1997-06-30 : CMSMcQ : change date, some cosmetic changes,
+changes to productions for choice, seq, Mixed, NotationType,
+Enumeration. Follow James Clark's suggestion and prohibit
+conditional sections in internal subset. TO DO: simplify
+production for ignored sections as a result, since we don't
+need to worry about parsers whi<! don't expand PErefs finding
+a conditional section.</sitem>
+<sitem>1997-06-29 : TB : various edits</sitem>
+<sitem>1997-06-29 : CMSMcQ : further changes:
+Suppress old FINAL EDIT comments and some dead material.
+Revise occurrences of % in grammar to exploit Henry Thompson's pun,
+especially markupdecl and attdef.
+Remove RMD requirement relating to element content (?).
+</sitem>
+<sitem>1997-06-28 : CMSMcQ : Various changes for 1 July draft:
+Add text for draconian error handling (introduce
+the term Fatal Error).
+RE deleta est (changing wording from
+original announcement to restrict the requirement to validating
+parsers).
+Tag definition of validawwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww it meant 'may or may not'.</sitem>
+<sitem>1997-03-21 : TB : massive changes on plane flight from Chicago
+to Vancouver</sitem>
+<sitem>1997-03-21 : CMSMcQ : correct as many reported errors as possible.
+</sitem>
+<sitem>1997-03-20 : CMSMcQ : correct typos listed in CMSMcQ hand copy of spec.</sitem>
+<sitem>1997 James Clark:
+Define the set of characters from which [^abc] subtracts.
+Charref should use just [0-9] not Digit.
+Location info needs cleaner treatment: remove? (ERB
+question).
+One example of a PI has wrong pic.
+Clarify discussion of encoding names.
+Encoding failure should lead to unspecified results; don't
+prescribe error recovery.
+Don't require exposure of entity boundaries.
+Ignore white space in element content.
+Reserve entity names of the form u-NNNN.
+Clarify relative URLs.
+And some of my own:
+Correct productions for content model: model cannot
+consist of a name, so "elements ::= cp" is no good.
+</sitem>
+<sitem>1996-11-11 : CMSMcQ : revise for style.
+Add new rhs to entity declaration, for parameter entities.</sitem>
+<sitem>1996-11-10 : CMSMcQ : revise for style.
+Fix / complete section on names, characters.
+Add sections on parameter entities, conditional sections.
+Still to do: Add compatibility note on deterministic content models.
+Finish stylistic revision.</sitem>
+<sitem>1996-10-31 : TB : Add Entity Handling section</sitem>
+<sitem>1996-10-30 : TB : Clean up term &amp; termdef. Slip in
+ERB decision re EMPTY.</sitem>
+<sitem>1996-10-28 : TB : Change DTD. Implement some of Michael's
+suggestions. Change comments back to //. Introduce language for
+XML namespace reservation. Add section on white-space handling.
+Lots more cleanup.</sitem>
+<sitem>1996-10-24 : CMSMcQ : quick tweaks, implement some ERB
+decisions. Characters are not integers. Comments are /* */ not //.
+Add bibliographic refs to 10646, HyTime, Unicode.
+Rename old Cdata as MsData since it's <emph>only</emph> seen
+in marked sections. Call them attribute-value pairs not
+name-value pairs, except once. Internal subset is optional, needs
+'?'. Implied attributes should be signaled to the app, not
+have values supplied by processor.</sitem>
+<sitem>1996-10-16 : TB : track down &amp; excise all DSD references;
+introduce some EBNF for entity declarations.</sitem>
+<sitem>1996-10-?? nsistency check, fix up scraps so
+they all parse, get formatter working, correct a few productions.</sitem>
+<sitem>1996-10-10/11 : CMSMcQ : various maintenance, stylistic, and
+organizational changes:
+Replace a few literals with xmlpio and
+pi""entities, to make them consistent and ensure we can change pic
+reliably when the ERB votes.
+Drop paragraph on recognizers from notation section.
+Add match, exact match to terminology.
+Move old 2.2 XML Processors and Apps into intro.
+Mention comments, PIs, and marked sections in discussion of
+delimiter escaping.
+Streamline discussion of doctype decl syntax.
+Drop old section of 'PI syntax' for doctype decl, and add
+section on partial-DTD summary PIs to end of Logical Structures
+section.
+Revise DSD syntax section to use Tim's subset-in-a-PI
+mechanism.</sitem>
+<sitem>1996-10-10 : TB : eliminate name recognizers (and more?)</sitem>
+<sitem>1996-10-09 : CMSMcQ : revise for style, consistency through 2.3
+(Characters)</sitem>
+<sitem>1996-10-09 : CMSMcQ : re-unite everything for convenience,
+at least temporarily, and revise quickly</sitem>
+<sitem>1996-10-08 : TB : first major homogenization pass</sitem>
+<sitem>1996-10-08 : TB : turn "current" attribute on div type into
+CDATA</sitem>
+<sitem>1996-10-02 : TB : remould into skeleton + entities</sitem>
+<sitem>1996-09-30 : CMSMcQ : add a few more sections prior to exchange
+ with Tim.</sitem>
+<sitem>1996-09-20 : CMSMcQ : finish transcribing notes.</sitem>
+<sitem>1996-09-19 : CMSMcQ : begin transcribing notes for draft.</sitem>
+<sitem>1996-09-13 : CMSMcQ : made outline from notes of 09-06,
+do some housekeeping</sitem>
+</slist>
+</revisiondesc>
+</header>
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is used to read XML documents
+and provide access to their content and structure.</termdef> <termdef
+id="dt-app" term="Application">It is @ssumed that an XML processor is
+doing its work on behalf of another module, called the
+<term>application</term>.</termdef> This specification describes the
+required beh\vior of an XML processor in terms of how it must read XML
+data and the information it must provide to the application.</p>
+
+<div2 id='sec-origin-goals'>
+<head>Origin and Goals</head>
+<p>XML was developed by an XML Working Group (orisable over the
+Internet.</p></item>
+<item><p>XML shall support a wide varie<EFBFBD>y of applications.</p></item>
+<item><p>XML shall be compatible with SGML.</p></item>
+<item><p>It shall be easy to write programs which process XML
+documents.</p></item>
+<item><p>The number of optional features in XML is to be kept to the
+absolute minimum, ideally zero.</p></item>
+<item><p>XML documents shou
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