Values presented for abbreviation are associated with an Item and
with a variable name. The Filter will attempt a match of the value against
the keys of a category corresponding to the variable name (see below),
under the jurisdiction set on the Item. If the attempt fails, and
if the jurisdiction is not default, a right-side element of the
jurisdiction key is removed, and the attempt is repeated. When no
element remain, the default jurisdiction is attempted.
If no match is found, the value is returned verbatim. If a match is found, the abbreviation is returned.