Re: [docbook] DocBook/XML catalog question

[Michael Smith <smith@xml-doc.org>]

Thomas Schraitle <tom_schr@web.de> writes:

> On Monday 10 October 2005 19:55, Jeroen Ruigrok/asmodai wrote:
> >
> > a quick question since I help maintain DocBook/XML for pkgsrc.org.
> >
> > DocBook/XML 4.1.2 - 4.4 are all backwards compatible, does this mean
> > that I can just add this to catalog.xml:
> >
> > <public publicId="-//OASIS//DTD DocBook XML V4.3//EN"
> >   uri="docbookx.dtd"/>
> >
> > <public publicId="-//OASIS//DTD DocBook XML V4.2//EN"
> >   uri="docbookx.dtd"/>
> >
> > <public publicId="-//OASIS//DTD DocBook XML V4.1.2//EN"
> >   uri="docbookx.dtd"/>
> >
> > This is what some people are suggesting.
> >
> > I am a bit hesitant to do 
> > this, due to the fact that if you explicitely want to validate against
> > 4.1.2 or 4.2 you will have a bit wider specification if you use 4.4's
> > DTD.
> 
> Your feelings are right. There are subtle changes from one version to the 
> other. For example, the xml:base attribute is introduced in version 4.3 
> (if I remember correct.) Documents will fail if they are validated 
> against version 4.2 and below.

But note that with the catalog setup Jeroen describes above, that
would never happen. Because users would always end up validating
against the latest version of the DTD.

  --Mike

-- 
Michael Smith
http://sideshowbarker.net/

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