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    The main idea is to use the capabilities of XPath to put restrictions on
    the structure and the content of XML documents.

    The standard behaviour is to fail on ``failed-assert`` findings only
    (``ASSERTS_ONLY``).  To change this, you can either pass a report filter
    function to the ``error_finder`` parameter (e.g. ``ASSERTS_AND_REPORTS``
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     1) Process inclusions
     2) Process abstract patterns
     3) Compile the schematron schema to XSLT

    The ``include`` and ``expand`` keyword arguments can be used to switch off
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    To set parameters for steps 1), 2) and 3) hand parameter dictionaries to the
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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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      ...     </rule>
      ...   </pattern>
      ... </schema>'''),
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      >>> xml = etree.XML('''
      ... <AAA name="aaa">
      ...   <BBB id="bbb"/>
      ...   <CCC color="ccc"/>
      ... </AAA>
      ... ''')

      >>> schematron.validate(xml)
      False

      >>> xml = etree.XML('''
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      ...   <BBB id="bbb"/>
      ...   <CCC/>
      ... </AAA>
      ... ''')

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