[tei-council] Two quick questions about Schematron constraints

[Martin Holmes]

I'm rather belatedly getting around to implementing a couple of 
schematron constraints I was tasked with at Ann Arbor, and thinking 
about the explanatory bit on constraints that I'll be writing for "How 
to edit the Guidelines".

Looking at the existing constraints, I have a couple of questions:

In this constraint (from delSpan):

   <constraintSpec ident="spanTo" scheme="isoschematron">
     <constraint>
       <assert xmlns="http://purl.oclc.org/dsdl/schematron" 
test="@spanTo">The spanTo= attribute of <name/> is required.</assert>
     </constraint>
   </constraintSpec>

does <name/> automatically get replaced by ancestor::elementSpec/@ident? 
What happens in the case of constraints on attributes? There appears to 
be only one (on @targetLang in att.pointing), but if <name/> were used 
there, would it be replaced with @targetLang, or with the ancestor's 
@ident (att.pointing)?

Secondly, these constraints appear on the root TEI element:

   <constraintSpec ident="c1" scheme="isoschematron">
     <constraint>
       <ns xmlns="http://purl.oclc.org/dsdl/schematron" prefix="tei" 
uri="http://www.tei-c.org/ns/1.0"/>
     </constraint>
   </constraintSpec>
   <constraintSpec ident="c2" scheme="isoschematron">
     <constraint>
       <ns xmlns="http://purl.oclc.org/dsdl/schematron" prefix="rng" 
uri="http://relaxng.org/ns/structure/1.0"/>
     </constraint>
   </constraintSpec>

What are they actually doing, if anything?

Cheers,
Martin
-- 
Martin Holmes
University of Victoria Humanities Computing and Media Centre
(mholmes at uvic.ca)