Schematron problem in DB5 grammar

[Jirka Kosek <jirka@kosek.cz>]

Hi Norm,

today I found one problem in a way in which Schematron is embedded 
inside RELAX NG schema. Schematron specification requieres that rule 
elements are enclosed in pattern element. However pattern elements are 
missing in the schema. Some tools (in this case oXygen) are then unable 
to process embeded Schematron rules.

Hard to say whether this can be considered as a bug in the schema 
because I didn't find any normative description of interaction between 
RELAX NG a Schematron.

I think that we could left RNC schema intact as it is mostly source 
format and I don't know any Schematron validator which is able to 
extract rules from RNC files. However I would suggest to surround rule 
elements by pattern element in RNG schemas. This should be matter of 
simple XSLT transformation in the build process. We also should add

<s:ns prefix="db" uri="http://docbook.org/ns/docbook"; 
xmlns:s="http://www.ascc.net/xml/schematron"/>

to the top of RNG schema. This is good practice in Schematron because of 
YOU-KNOW-WHO (QNames in attribute values ;-) and some Schematron 
implementatios are not working without this.

I'm really looking forward for releasing "TC blessed" DocBook V5. I 
think it would put more attraction to new schemas and similar minor 
problems will be found and sorted out fastly.

					Jirka

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   Jirka Kosek     e-mail: jirka@kosek.cz     http://www.kosek.cz
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