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

["John Interrante (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DAFFODIL-2363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17155485#comment-17155485 ] 

John Interrante edited comment on DAFFODIL-2363 at 7/10/20, 1:51 PM:
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I went to <[https://www.freeformatter.com/xml-validator-xsd.html]> and tried Steve's pattern: 
{code:xml}
(&#x0000;|&#xE000;)*
{code}
It doesn't work there; the validator returned the message 
{code:xml}
Character Reference "&#x0000" Is An Invalid XML Character.
{code}

DFDL allows the character entity %NUL; to be used instead so the pattern still might work in DFDL.


was (Author: interran):
I went to <[https://www.freeformatter.com/xml-validator-xsd.html]> and tried Steve's pattern: (&#x0000;|&#xE000;)*.  It doesn't work there; the validator returned the message `Character Reference "&#x0000" Is An Invalid XML Character.`  

DFDL allows the character entity %NUL; to be used instead of &#x0000; so the pattern still might work in DFDL.

> pattern facet can't use &#xE000; 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
>            Priority: Major
>             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 
> {code:xml}
> <xs:simpleType name="allNULStringType>
>   <xs:restriction base="xs:string">
>      <xs:pattern value="&#xE000;*"/>
>   </xs:restriction>
> </xs:simpleType>
> {code}
> 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 
> {code:java}
> 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): *
> {code}
> If github does the right thing that pattern will look like the E000 box char and *. 



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