pattern does not match valid instance
-------------------------------------

         Key: XERCESC-1588
         URL: http://issues.apache.org/jira/browse/XERCESC-1588
     Project: Xerces-C++
        Type: Bug

  Components: Validating Parser (Schema) (Xerces 1.5 or up only)  
    Versions: 2.7.0    
 Environment: all
    Reporter: Boris Kolpackov


$ cat >test.xsd

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";>

  <xs:simpleType name="RFC_0882_Zone">
    <xs:restriction base="xs:string">
      <xs:pattern value="|GMT|[\-+]([0-1][0-9]|2[0-3])[0-5][0-9]"/>
    </xs:restriction>
  </xs:simpleType>

  <xs:element name="test" type="RFC_0882_Zone" />
</xs:schema>

$ cat >test.xml

<test xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:noNamespaceSchemaLocation="test.xsd">GMT</test>

$ dom_count -v=always -n -s -f test.xml 

Error at file /tmp/test.xml, line 1, char 112
  Message: Datatype error: Type:InvalidDatatypeValueException, Message:Value 
'GMT' does not match regular expression facet 
'|GMT|[\-+]([0-1][0-9]|2[0-3])[0-5][0-9]'.

If one changes the pattern to read 'GMT|[\-+]([0-1][0-9]|2[0-3])[0-5][0-9]|' 
(i.e., moves empty option to the end), it works ok.


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