Possible spurious error messages about xref's

[catterall]

It looks like I'm getting spurious error messages when I use xref's to id's in xinclude's. Or I'm doing something wrong. Any help welcome. No ultimate problem, the documents transform OK and the links work, it's just that I wasted time chasing errors that weren't there.

(Latest Oxygen, MacOS 10.2.8 on a G4 Server)

Ron

The files I tested it on follow

-------------------------------------------
file: Book.xml
-------------------------------------------
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"/Applications/Utilities/oxygen/3.1/oxygen/docbook/dtd/docbookx.dtd"
[
<!ENTITY % local_adds SYSTEM "local_adds.dtd" >
%local_adds;
]>
<book id="Book" lang="EN">
<title>
Book
</title>
<!--
In this book I first include a 'part' which then includes 'chapters'. The 'part' also includes 'xref's to the chapters. When this 'book' file or the 'part' file are validated, I get error messages saying the id's in the 'xref's can't be found. Despite these error messages it all transforms OK and the links work - I believe that the 'book' is actually valid, and the error messages are spurious. But when I get error messages on validation like:
'E An element with the identifier "Link3" must appear in the document.'
I tend to spend time looking for them - and in this case there aren't any.
The errors are generated by the 'part' file' - the 'book' file is not really needed.
local_adds.dtd includes the bits to make 'xinclude's work.
<!ENTITY % xinclude SYSTEM "_DocBook42/xinclude.mod" >
%xinclude;
The _DocBook42/xinclude.mod file holds:
<!ELEMENT xi:include (xi:fallback?) >
<!ATTLIST xi:include
xmlns:xi CDATA #FIXED "http://www.w3.org/2001/XInclude"
href CDATA #REQUIRED
parse (xml|text) "xml"
xpointer CDATA #IMPLIED
encoding CDATA #IMPLIED
accept CDATA #IMPLIED
accept-charset CDATA #IMPLIED
accept-language CDATA #IMPLIED >
<!ELEMENT xi:fallback ANY >
<!ATTLIST xi:fallback
xmlns:xi CDATA #FIXED "http://www.w3.org/2001/XInclude" >
<!ENTITY % local.preface.class "| xi:include" >
<!ENTITY % local.part.class "| xi:include" >
<!ENTITY % local.chapter.class "| xi:include" >
<!ENTITY % local.divcomponent.mix "| xi:include" >
<!ENTITY % local.para.char.mix "| xi:include" >
<!ENTITY % local.info.class "| xi:include" >
<!ENTITY % local.common.attrib "xml:base CDATA #IMPLIED xmlns:xi CDATA #FIXED 'http://www.w3.org/2001/XInclude'" >
-->
<xi:include
href="Part.xml"
xmlns:xi="http://www.w3.org/2001/XInclude" >
</xi:include>
</book>
-------------------------------------------
file: Part.xml
-------------------------------------------
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE part PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"/Applications/Utilities/oxygen/3.1/oxygen/docbook/dtd/docbookx.dtd"
[
<!ENTITY % local_adds SYSTEM "local_adds.dtd" >
%local_adds;
]>
<part id="Part" lang="EN">
<title>
Part
</title>
<partintro>
<para>
In <xref linkend="Link1" /> we do this, in <xref linkend="Link2" /> we do that, and in <xref linkend="Link3" /> we do the other.
</para>
</partintro>
<xi:include
href="Link1.xml"
xmlns:xi="http://www.w3.org/2001/XInclude" >
</xi:include>
<xi:include
href="Link2.xml"
xmlns:xi="http://www.w3.org/2001/XInclude" >
</xi:include>
<xi:include
href="Link3.xml"
xmlns:xi="http://www.w3.org/2001/XInclude" >
</xi:include>
</part>
-------------------------------------------
file: Link1.xml
-------------------------------------------
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "/Applications/Utilities/oxygen/3.1/oxygen/docbook/dtd/docbookx.dtd"
[
<!ENTITY % local_adds SYSTEM "local_adds.dtd" >
%local_adds;
]>
<chapter id="Link1" lang="EN">
<title>
Link1
</title>
<para>
In this chaper we do this.
</para>
</chapter>
-------------------------------------------
file: Link2.xml
-------------------------------------------
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "/Applications/Utilities/oxygen/3.1/oxygen/docbook/dtd/docbookx.dtd"
[
<!ENTITY % local_adds SYSTEM "local_adds.dtd" >
%local_adds;
]>
<chapter id="Link2" lang="EN">
<title>
Link2
</title>
<para>
In this chaper we do that.
</para>
</chapter>
-------------------------------------------
file: Link3.xml
-------------------------------------------
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "/Applications/Utilities/oxygen/3.1/oxygen/docbook/dtd/docbookx.dtd"
[
<!ENTITY % local_adds SYSTEM "local_adds.dtd" >
%local_adds;
]>
<chapter id="Link3" lang="EN">
<title>
Link3
</title>
<para>
In this chaper we do the other.
</para>
</chapter>
-------------------------------------------

[sorin_ristache]

Hello,

You are right, we tried the example files and the links work in the transformation result. The errors are probably there because Xerces's XInclude support is still experimental. Let's hope it will improve in the next versions.

Best regards,
Sorin