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    The main idea is to use the capabilities of XPath to put restrictions on
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     2) Process abstract patterns
     3) Compile the schematron schema to XSLT

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      >>> from lxml.isoschematron import Schematron

      >>> schematron = Schematron(etree.XML('''
      ... <schema xmlns="http://purl.oclc.org/dsdl/schematron" >
      ...   <pattern id="id_only_attribute">
      ...     <title>id is the only permitted attribute name</title>
      ...     <rule context="*">
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      ...   <CCC color="ccc"/>
      ... </AAA>
      ... ''')

      >>> schematron.validate(xml)
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      >>> xml = etree.XML('''
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      ...   <CCC/>
      ... </AAA>
      ... ''')

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