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Y ���w xY w# ejF $ r d� Z"Y �Lw xY w) zxThe ``lxml.isoschematron`` package implements ISO Schematron support on top
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An ISO Schematron validator.
Pass a root Element or an ElementTree to turn it into a validator.
Alternatively, pass a filename as keyword argument 'file' to parse from
the file system.
Schematron is a less well known, but very powerful schema language.
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``
or a custom ``XPath`` object), or subclass isoschematron.Schematron for
complete control of the validation process.
Built on the Schematron language 'reference' skeleton pure-xslt
implementation, the validator is created as an XSLT 1.0 stylesheet using
these steps:
0) (Extract from XML Schema or RelaxNG schema)
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
steps 1) and 2).
To set parameters for steps 1), 2) and 3) hand parameter dictionaries to the
keyword arguments ``include_params``, ``expand_params`` or
``compile_params``.
For convenience, the compile-step parameter ``phase`` is also exposed as a
keyword argument ``phase``. This takes precedence if the parameter is also
given in the parameter dictionary.
If ``store_schematron`` is set to True, the (included-and-expanded)
schematron document tree is stored and available through the ``schematron``
property.
If ``store_xslt`` is set to True, the validation XSLT document tree will be
stored and can be retrieved through the ``validator_xslt`` property.
With ``store_report`` set to True (default: False), the resulting validation
report document gets stored and can be accessed as the ``validation_report``
property.
If ``validate_schema`` is set to False, the validation of the schema file
itself is disabled. Validation happens by default after building the full
schema, unless the schema validation file cannot be found at import time,
in which case the validation gets disabled. Some lxml distributions exclude
this file due to licensing issues. ISO-Schematron validation can then still
be used normally, but the schemas themselves cannot be validated.
Here is a usage example::
>>> from lxml import etree
>>> 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="*">
... <report test="@*[not(name()='id')]">Attribute
... <name path="@*[not(name()='id')]"/> is forbidden<name/>
... </report>
... </rule>
... </pattern>
... </schema>'''),
... error_finder=Schematron.ASSERTS_AND_REPORTS)
>>> xml = etree.XML('''
... <AAA name="aaa">
... <BBB id="bbb"/>
... <CCC color="ccc"/>
... </AAA>
... ''')
>>> schematron.validate(xml)
False
>>> xml = etree.XML('''
... <AAA id="aaa">
... <BBB id="bbb"/>
... <CCC/>
... </AAA>
... ''')
>>> schematron.validate(xml)
True
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