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[xsl] xml validation

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Hello list,
I would be very grateful if you can share some of your experience to
help me make a decision.

In my next project I want to implement xml validation for documents
built using values entered in html forms. An important requirement is
being able to map errors in elements or atributes back to the
textboxes from which the values came from.

My platform is .net, and my xslt processor is saxon-b. In .net you
have support for xml schema, and I can read a whole document and
capture all the errors and local-names of elements and attributes, but
I cannot use my own error messages (a far as I know), and I would have
to write I lot of xsd code and some c#.

I'm not looking at xforms because I don't know any .net
implementation, I want complete control over html and I want complete
separation between html and validation rules.

Schematron seems like a very friendly and extensible solution built on
top of xslt. Maybe I could even take advantage of the built-in atomic
types in xslt2, and for example test if the 'price' element has a
valid string value for an xs:integer type, using the <castable as>
operator (i don't know if this would work).

Has anyone here used Schematron for my use case? My intention is to
use xslt2 as my primary programming language.

Thanks,
Max

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