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Re: [xml-dev] Status of ISO Schematron

From: Rick Jelliffe <rjelliffe@-------.---.-->
To: Fraser Goffin <goffinf@-------.--->
Date: 2/13/2006 5:00:00 AM
Fraser Goffin wrote:

> When you say 'extension elements' do you mean use your own custom 
> elements/attributes where the schemaTron schema provides for 
> extensibility, or are you talking about something else entirely ? 

Schematron allows foreign-namespace elements and attributes everywhere IIRC.

So you while you cannot change the rule semantics, you can certainly add 
extra annotating
capabilities. For example, you could add

<sch:rule  context="date"/>
  <sch:assert  test="string-length(.) &gt; 8">A date should be 
dd/mm/yyyy format</sch:assert>
  <my:mailto to="mcguffin@g..." sj="Someone has used the date 
element!" />
  ...
</sch:rule>

ISO Schematron also has a flag facility, where  named flags can be set 
by assertion failures.
These give a standard way to extract and arbitrary number boolean facts 
about a document wthout adding any output-specific information, or 
requring messages to have a particular format that gets reparsed, etc.

Cheers
Rick Jelliffe


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