John Poole created XERCESJ-1749:
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Summary: XInclude parsing fails on legal construct
Key: XERCESJ-1749
URL: https://issues.apache.org/jira/browse/XERCESJ-1749
Project: Xerces2-J
Issue Type: Bug
Components: XInclude 1.0
Affects Versions: 2.12.2
Environment: jlpoole@ares /usr/local/src/xerces_2.12.2/xerces-2_12_2 $
java -version
openjdk version "1.8.0_332"
OpenJDK Runtime Environment (Temurin)(build 1.8.0_332-b09)
OpenJDK 64-Bit Server VM (Temurin)(build 25.332-b09, mixed mode)
jlpoole@ares /usr/local/src/xerces_2.12.2/xerces-2_12_2 $
I downloaded Xerces-J-src.2.12.2.tar.gz and Xerces-J-tools.2.12.2.tar.gz and
built same, then tested with the example file above.
Attaching examples_log.txt, dated Wednesday Aug 17, 2022 11:35:34 AM, of runs
for both files also showing xmllint output successfully resolving the XIncludes.
Reporter: John Poole
Attachments: examples_log.txt
Suppose a3.xml:
{noformat}
<book xmlns="http://docbook.org/ns/docbook";
xmlns:xlink="http://www.w3.org/1999/xlink";
xmlns:xi="http://www.w3.org/2001/XInclude";
xml:id="a-book"
version="5.0">
<title>A</title>
<chapter xml:id="a-chapter">
<title>a chapter</title>
<BurstingPara xml:id="t1000">Warning: Read following paragraph
carefully.</BurstingPara>
<para>foo</para>
<xi:include href="a3.xml" xpointer="t1000"/>
<para>foo2</para>
<xi:include href="a3.xml" xpointer="t1000"/>
<para>foo3</para>
</chapter>
<xi:include href="a3.xml" xpointer="a-chapter"/>
</book>{noformat}
Xerces 2.12.2 rejects the XML with:
{noformat}
jlpoole@ares /usr/local/src/xerces_2.12.2/xerces-2_12_2 $ java dom.Writer -xi
a3.xml
[Fatal Error] a3.xml:1:1: Recursive include detected. Document
'file:///usr/local/src/xerces_2.12.2/xerces-2_12_2/a3.xml' was already
processed.
[Fatal Error] a3.xml:11:53: Error attempting to parse XML file (href='a3.xml').
jlpoole@ares /usr/local/src/xerces_2.12.2/xerces-2_12_2 $ {noformat}
The XML XIncludes above are a legal construct, yet Xerces throws an error when
the parser should process the XIncludes.
This bug mimics the bug encountered in the Gnome XMLParser2 project:[ xmllint
handling of recursion|[https://gitlab.gnome.org/GNOME/libxml2/-/issues/348]]
Here is another sample file illustrating the failure:
{code:java}
<book xmlns="http://docbook.org/ns/docbook";
xmlns:xlink="http://www.w3.org/1999/xlink";
xmlns:xi="http://www.w3.org/2001/XInclude";
xml:id="b-book"
version="5.0">
<title>B</title>
<chapter xml:id="b-chapter">
<title>b chapter</title>
<para>foo</para>
</chapter>
<xi:include href="a3.xml" xpointer="a-chapter"/>
</book>{code}
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