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117 lines
5.1 KiB
117 lines
5.1 KiB
From 4ac96ce046e9f58141bd66639ba8cb1fad9deefb Mon Sep 17 00:00:00 2001
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From: Stefan Behnel <stefan_ml@behnel.de>
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Date: Wed, 12 Jul 2023 16:59:07 +0200
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Subject: [PATCH] Make the validation of ISO-Schematron files optional in lxml,
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depending on the availability of the RNG validation file. Some lxml
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distributions discard the validation schema file due to licensing issues.
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See https://bugs.launchpad.net/lxml/+bug/2024343
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---
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CHANGES.txt | 11 +++++++++++
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doc/validation.txt | 9 +++++++++
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src/lxml/isoschematron/__init__.py | 24 +++++++++++++++++++-----
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3 files changed, 39 insertions(+), 5 deletions(-)
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diff --git a/CHANGES.txt b/CHANGES.txt
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index c684ad5..40e32cd 100644
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--- a/CHANGES.txt
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+++ b/CHANGES.txt
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@@ -2,6 +2,17 @@
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lxml changelog
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==============
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+4.9.2+
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+======
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+
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+* LP#2024343: The validation of the schema file itself is now optional in the
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+ ISO-Schematron implementation. This was done because some lxml distributions
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+ discard the RNG validation schema file due to licensing issues. The validation
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+ can now always be disabled with ``Schematron(..., validate_schema=False)``.
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+ It is enabled by default if available and disabled otherwise. The module
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+ constant ``lxml.isoschematron.schematron_schema_valid_supported`` can be used
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+ to detect whether schema file validation is available.
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+
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4.9.2 (2022-12-13)
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==================
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diff --git a/doc/validation.txt b/doc/validation.txt
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index af9d007..27c0ccd 100644
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--- a/doc/validation.txt
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+++ b/doc/validation.txt
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@@ -615,6 +615,15 @@ The usage of validation phases is a unique feature of ISO-Schematron and can be
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a very powerful tool e.g. for establishing validation stages or to provide
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different validators for different "validation audiences".
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+Note: Some lxml distributions exclude the validation schema file due to licensing issues.
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+Since lxml 4.9.2-8, the validation of the user provided schema can be disabled with
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+``Schematron(..., validate_schema=False)``.
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+It is enabled by default if available and disabled otherwise. Previous versions of
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+lxml always had it enabled and failed at import time if the file was not available.
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+Thus, some distributions chose to remove the entire ISO-Schematron support.
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+The module constant ``lxml.isoschematron.schematron_schema_valid_supported`` can be used
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+since lxml 4.9.2-8 to detect whether schema file validation is available.
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+
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(Pre-ISO-Schematron)
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--------------------
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diff --git a/src/lxml/isoschematron/__init__.py b/src/lxml/isoschematron/__init__.py
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index 5967b10..2846a66 100644
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--- a/src/lxml/isoschematron/__init__.py
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+++ b/src/lxml/isoschematron/__init__.py
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@@ -61,10 +61,16 @@ iso_svrl_for_xslt1 = _etree.XSLT(_etree.parse(
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svrl_validation_errors = _etree.XPath(
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'//svrl:failed-assert', namespaces={'svrl': SVRL_NS})
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-
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# RelaxNG validator for schematron schemas
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-schematron_schema_valid = _etree.RelaxNG(
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- file=os.path.join(_resources_dir, 'rng', 'iso-schematron.rng'))
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+schematron_schema_valid_supported = False
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+try:
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+ schematron_schema_valid = _etree.RelaxNG(
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+ file=os.path.join(_resources_dir, 'rng', 'iso-schematron.rng'))
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+ schematron_schema_valid_supported = True
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+except _etree.RelaxNGParseError:
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+ # Some distributions delete the file due to licensing issues.
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+ def schematron_schema_valid(arg):
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+ raise NotImplementedError("Validating the ISO schematron requires iso-schematron.rng")
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def stylesheet_params(**kwargs):
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@@ -153,6 +159,13 @@ class Schematron(_etree._Validator):
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report document gets stored and can be accessed as the ``validation_report``
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property.
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+ If ``validate_schema`` is set to False, the validation of the schema file
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+ itself is disabled. Validation happens by default after building the full
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+ schema, unless the schema validation file cannot be found at import time,
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+ in which case the validation gets disabled. Some lxml distributions exclude
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+ this file due to licensing issues. ISO-Schematron validation can then still
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+ be used normally, but the schemas themselves cannot be validated.
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+
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Here is a usage example::
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>>> from lxml import etree
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@@ -234,7 +247,8 @@ class Schematron(_etree._Validator):
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def __init__(self, etree=None, file=None, include=True, expand=True,
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include_params={}, expand_params={}, compile_params={},
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store_schematron=False, store_xslt=False, store_report=False,
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- phase=None, error_finder=ASSERTS_ONLY):
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+ phase=None, error_finder=ASSERTS_ONLY,
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+ validate_schema=schematron_schema_valid_supported):
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super(Schematron, self).__init__()
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self._store_report = store_report
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@@ -273,7 +287,7 @@ class Schematron(_etree._Validator):
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schematron = self._include(schematron, **include_params)
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if expand:
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schematron = self._expand(schematron, **expand_params)
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- if not schematron_schema_valid(schematron):
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+ if validate_schema and not schematron_schema_valid(schematron):
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raise _etree.SchematronParseError(
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"invalid schematron schema: %s" %
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schematron_schema_valid.error_log)
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--
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2.40.1
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