RE: [docbook-apps] Xmllint error

["Kenneth Johansson" <ke-joh@sectra.se>]

Thanks, that was a thourough answer.

Maybe something for the DocBook FAQ?

/Kenneth

--------------------------------------------------------
Kenneth Johansson	Technical Documentation Manager
Sectra Imtec AB
Teknikringen 2		E-mail: ke-joh AT sectra DOT se
SE-583 30 Linköping	Phone:	+46 13 23 52 00
SWEDEN			Web:	http://www.sectra.se 

> 
> -----Original Message-----
> From: Daniel Veillard [mailto:veillard@redhat.com] 
> Sent: Tuesday, October 07, 2003 12:23
> To: Kenneth Johansson
> Cc: DOCBOOK-APPS
> 
> On Tue, Oct 07, 2003 at 11:31:23AM +0200, Kenneth Johansson wrote:
> > Hi,
> > 
> > When compiling my modular docbook file I get this xmllint 
> error message.
> > What am I doing wrong?
> 
>   Nothing. It's a problem between DocBook DTD and XInclude.
> 
> > $ xmllint --xinclude --postvalid IDS5webUGbook.xml > out.xml
> > IDS5web/1_Introduction/chapter_all_introduction.xml:3: No 
> declaration 
> > for attribute base of element chapter .
> 
>   Since there seems to be some confusion about the exact 
> problem let me explain a bit what's going on:
>    
>    xmllint --xinclude --postvalid does the following:
>     1/ parse the document, load the DTD but does not validate while
>        parsing
>     2/ apply the XInclude processing which will recursively traverse
>        the document(s) and include the new informations gathered from
>        new documents (or text source)
>     3/ validate the resulting in-memory tree with the DTD from the
>        "main" document.
> 
>  So now what's this base attribute, where does it come from, and why:
>     1/ it's actually xml:base , an attribute which allows to 
> set the base
>        for URI-Reference computation done in the subtree of 
> the document.
>     2/ it is added by XInclude processing to not break references done
>        from included document. Say that main.xml includes 
> subdir/chapter.xml
>        and that subdir/chapter.xml references an image img.png .
>        The rules for references expects the image to be found 
> in subdir/img.png
>     3/ XInclude has no notion of what in teh included document might
>        be a reference. So to preserve the linking 
> functionality it mandates
>        to add an xml:base="subdir/chapter.xml" at the point where the
>        inclusion occured si that the reference from the 
> resulting document
>        to the image be preserved.
> 
>  The consequence is:
>    - there is nothing to prevent this from an authoring point of view
>      except keeping all the included fragment in the same directory
>      as the main document
>    - the only solution is to get Docbook XML DTD to allow xml:base as
>      a #IMPLIED attributes on the elements which are likely 
> to be top of
>      inserted documents. I though this was agreed upon but 
> didn't checked
>      the progress, Norm or Paul can probably tell us more about this.
> 
>  At the moment you can safely ignore any [xml:]base attribute 
> error message resulting from postvalid after XInclude processing.
> 
> Daniel
> 
> 
> 
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