Steve Lawrence created DAFFODIL-2877:
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Summary: Allow pattern restriction facet to be used on non-string
types
Key: DAFFODIL-2877
URL: https://issues.apache.org/jira/browse/DAFFODIL-2877
Project: Daffodil
Issue Type: New Feature
Components: Back End, Front End
Reporter: Steve Lawrence
Section 5.2 of the DFDL specification says that the pattern restriction facet
can only be used for xs:string types. Daffodil currently implements this
limitation.
However, there are a number of cases where a pattern is the only way to
correctly restrict the value of non-string types, such as xs:long.
One example is a number that can only be between 100 and 300 but in multiples
of 5. In that case, a pattern like this would work:
{code}
<xs:pattern value="([12][0-9][05])|([300])" />
{code}
Another example could be apartment rooms, where the first digit represents the
floor (e.g. 1-5), and the second two digits represent the room number between 1
and 15 (assuming 15 rooms per floor). In that case, the pattern restriction
might be:
{code}
<xs:pattern value="[1-5]((0[1-9])|(1[0-5]))" />
{code}
The patterns are often going to be a bit ugly, but in some cases it's the only
way to correctly validate numbers using only XML Schema capabilities.
Note that only supporting pattern on xs:string types is a limitation imposed by
DFDL--XML schema allows pattern restriction on all types. We should remove this
limitation and allow pattern facet to be used on all types.
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