[oXygen-user] RE: Docbook 5.0 Relax Schema and Xpointer Resolution

George Cristian Bina
Fri Nov 11 08:17:42 CST 2005

Hi Ray,

We will look into this, however it is not an easy task.
To understand what happens here it is how the processing is performed. 
Let's assume you have an XML document master.xml and a document from 
which you want to include a fragment, fragment.xml.

The Relax NG validator acts as a SAX content handler placed after the 
XML parser that parses the document.

The XML parser does not know about the Relax NG validator.

The XInclude processing is done inside the XML parser

So, when the XML parser parses master.xml it will already resolve the 
XInclude element and will replace it with the actual included content. 
This reach the Relax NG validator. In the parsing phase there is no 
schema processing involved as the XML parser does not even know about a 
schema processor. In order to have a fragment from fragment.xml included 
you need to know what is an ID in fragment.xml and for that you need to 
parse it against a schema (but that document may not be valid against 
some schema or there may be no schema associated with it). In any case, 
finding the IDs in the fragment.xml requires parsing it against a schema 
from the XML parser which does not know about any schema.

Now, the possible solution here will be to forget about schema and rely 
on the xml:id for determining what values represent IDs in the included 
document. This I think is doable but again it is not a trivial task. I 
will add this on our bugzilla and we will look into it.

As a workaround for the current situation you can place the content you 
want to include in a separate file and include it both from the master 
document and from the fragment document. For instance if you have a para 
in the fragment.xml then you can place that in a new file, xinclude that 
file in fragment.xml in the place the para used to be and xinclude it 
also in the master xml where you included it using xpointer.

Best Regards,
George Cristian Bina
<oXygen/> XML Editor, Schema Editor and XSLT Editor/Debugger

Ray Miller wrote:
>>> IDs are supported only when they are defined in DTDs. <<
> So how will the oXygen community cope with Docbook-rng schemas; surely
> oXygen has a plan other than to state nonsupport.
> Xinclude / XPointer is essential for many of us docbook users.
> Advice please.
> Ray
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