Users will want to "round out" the implementation of My App (or any other subclass of xmlproc.Application) to perform "application specific" parsing per their particular needs.
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Pass an Element or Element Tree object to construct a Schematron validator: .
Schematron automatically converts these parameters to stylesheet parameters so you need not worry to set string parameters using quotes or to use XSLT.strparam().
However, I had to dig around a bit to find out how perform validated parsing (against an external DTD) using xmlval and xmldtd.
The above recipe provides pretty much all the information you need to know for doing this.
You can then validate some Element Tree document against the schema.
You'll get back True if the document is valid against the Relax NG schema, and False if not: Note that this error log is local to the Relax NG object.
The The usage of validation phases is a unique feature of ISO-Schematron and can be a very powerful tool e.g.
for establishing validation stages or to provide different validators for different "validation audiences".
It will only contain log entries that appeared during the validation.
Similar to XSLT, there's also a less efficient but easier shortcut method to do one-shot Relax NG validation: lxml.etree also has XML Schema (XSD) support, using the class lxml.etree. The API is very similar to the Relax NG and DTD classes.
lxml also provides support for ISO-Schematron, based on the pure-XSLT skeleton implementation of Schematron: There is also basic support for The parser in lxml can do on-the-fly validation of a document against a DTD or an XML schema.