Mike Beckerle created DAFFODIL-2363:
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Summary: pattern facet can't use  notation. Makes
validating NUL very hard.
Key: DAFFODIL-2363
URL: https://issues.apache.org/jira/browse/DAFFODIL-2363
Project: Daffodil
Issue Type: Bug
Components: Back End
Affects Versions: 2.7.0
Reporter: Mike Beckerle
Fix For: 3.0.0
See test_nulPattern1.
This bug is a real pain in the neck.
I want to capture NUL padding regions and insure they are all NUL.
These come through to XML as These U+E000 characters. I need to insure that the
string contains only those.
So I'd like to use a
```
<xs:simpleType name="allNULStringType>
<xs:restriction base="xs:string">
<xs:pattern value="*"/>
</xs:restriction>
</xs:simpleType>
```
I consider this data well-formed (should parse) even if other bytes are there
that aren't NUL, but such data is invalid. So I want the facet to check for all
NUL chars (or these E000 things that Daffodil puts in XML because XML can't
contain actual NUL chars).
The test fails with
```
org.apache.daffodil.tdml.TDMLExceptionImpl: (Implementation: daffodil)
Validation errors found where none were expected by the test case.
Validation Error: ex:foo failed facet checks due to: facet pattern(s): *
```
If github does the right thing that pattern will look like the E000 box char
and *.
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