[jira] [Created] (DAFFODIL-2363) pattern facet can't use  notation. Makes validating NUL very hard.

["Mike Beckerle (Jira)" <ji...@apache.org>]

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="&#xE000;*"/>
  </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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