[ANN] ODF extension schema & validation
mst at libreoffice.org
Mon Jul 2 15:30:34 UTC 2018
the result of a TDF-sponsored project have landed on master now: we have
an ODF schema that contains LibreOffice extensions, and this is used in
all unit tests if --with-export-validation is given, which is the default.
notably this means that if you add a new feature to the ODF filters and
you add the required unit test for the new feature, then most likely the
test will fail with a complaint from the validator; in this case the
schema needs to be updated to contain the new elements and attributes.
the schema files are in core.git in the schema/libreoffice directory.
the extension schema uses the RelaxNG "include" feature to refer to the
ODF schema; this means that it only contains those parts of the schema
that actually need to be changed - this works well in many cases because
the ODF schema is quite well structured with many named patterns, but
unfortunately there are a few places where that isn't the case and large
chunks needed to be copied to override them.
in the easy case, to add an attribute you just want to search for the
corresponding element, which will have a "foo-attlist" named pattern,
and then add another attribute like this:
<rng:define name="draw-enhanced-geometry-attlist" combine="interleave">
currently only the features that are actually exported in the unit tests
have been added to the schema; there is still some work to do here to
add everything; the crashtesting script also does ODF validation of all
files and now also uses the custom schema, so those results will be
during this work we found a couple bugs where the schema and the export
filter didn't agree; this led to updating at least one not-yet-accepted
proposal at OASIS, and 2 bug fixes in LO code.
unfortunately it turned out that there are a lot of extensions already
for which no proposal exists, and in many cases not even an entry on the
Wiki , so clearly something like this extension schema is needed :)
 git grep TODO schema/libreoffice
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