[oXygen-user] Validate xref when XInclude

[George Cristian Bina]

Hi Sean,

The samples are incomplete and do not allow to reproduce the problem.
However I guess that the problem comes from how Xerces validates the
documents with XInclude:
    - each of the included documents is validated against its specified DTD
    - the main document is validated against its specified DTD but without
taking into account the included content (that is it validates the
xi:include tag itself, it does not replace the xi:include with the included
document for validation).

In your case linkend is defined as IDREF and there is an error if there is
no corresponding ID attribute with the same value in the document.

In order to actually validate a document with XInclude against the Docbook
DTD one has to pass the document through a copy transformation that will
create a single document with all the XInclude elements replaced with the
actual content.

Best Regards,
George


----- Original Message -----
From: "Sean Wheller" <>
To: <>
Sent: Monday, September 27, 2004 11:46 PM
Subject: [oXygen-user] Validate xref when XInclude


> Hi,
>
> I can't validate xref's when using XInclude. Though as I understand it
should
> be possible with Apache Xerces-J. Comment out xref's and all is valid.
When I
> transform the document the xref's (uncommented), are resolved correctly.
>
> Validation returns:
>
> "An element with the identifier "docbookxsl" must appear in the document.
> preface.xml"
>
> Any ideas?
>
> Following is relevant info from files.
>
> BOOK.XML
> ---------------------------
> <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
>
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [
> <!ENTITY % xinclude SYSTEM
"/home/sean/apps/oxygen/docbook/dtd/xinclude.mod">
> %xinclude;
> <!ENTITY % global_ents SYSTEM "global.ent">
> %global_ents;
> ]>
> <!-- I use a combination of XInclude and Entities -->
> <book>
> ...
> <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="preface.xml">
>     <xi:fallback xmlns:xi="http://www.w3.org/2001/XInclude">FIX
> ME</xi:fallback>
>   </xi:include>
> ...
> <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="biblio.xml">
>     <xi:fallback xmlns:xi="http://www.w3.org/2001/XInclude">FIX
> ME</xi:fallback>
>   </xi:include>
> </book>
>
> XREF IN PREFACE.XML
> ---------------------------
> <para>The first, &quot;Docbook - The Definitive Guide&quot; <xref
> linkend="docbookxsl"/> is about the Docbook Document Type Definition
> (DTD).</para>
>
>     <para>The second, &quot;Docbook XSL - The Complete Guide&quot; <xref
> linkend="docbooktdg"/> is about the Docbook Stylesheets (XSL's).</para>
>
> BIBLIOENTRY in BIBLIO.XML
> ---------------------------
>
> <biblioentry id="docbookxsl">
>     <authorgroup>
>       <author>
>         <firstname>Bob</firstname>
>         <surname>Stayton</surname>
>       </author>
>     </authorgroup>
> ...
> </biblioentry>
> <biblioentry id="docbooktdg">
>     <authorgroup>
>       <author>
>         <firstname>Norman</firstname>
>         <surname>Walsh</surname>
>       </author>
>       <author>
>         <firstname>Leonard</firstname>
>         <surname>Muellner</surname>
>       </author>
>     </authorgroup>
> ...
> </biblioentry>
>
>
> ..........................
> Oxygen 4.2
> Apache Xerces-J 2.6.2
> Apache Xalan Java 2.5.1
> SAXON 6.5.3
> Apache FOP 0.20.5
> OASIS  DocBook  XML  DTD 4.2
> DocBook  XSL 1.64.1
>
> --
> Sean Wheller
> 
> http://www.enbaya.co.za
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