[XERCESC-2115] XSD xs:union always collapses whitespace

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.1.4
• Component/s: Validating Parser (XML Schema)
• Environment: Windows 7, likely also Mac and Linux but didn't check
• Assignee: Unassigned
• Reporter: Brian Chapman
• Created: 11/Aug/17 01:14
• Updated: 11/Aug/17 17:27

Description

see: https://stackoverflow.com/questions/39755370/xerces-c-xml-xsd-union-always-collapsing-whitespace for longer discussion.

I find that the problem doesn't care what I union with, or that I union with anything at all. So the simplest demonstration is to add these definitions to the above XSD.

  <xs:simpleType name="HellUnion">
    <xs:union memberTypes="Hello" />
  </xs:simpleType>
  <xs:element name="root2">
    <xs:complexType>
      <xs:attribute name="stuff" type="HellUnion" />
    </xs:complexType>
  </xs:element>

Then Xerces-C rejects this XML as not valid:

<?xml version="1.0" encoding="UTF-8" ?>
<root2 stuff="Hello World&#x09;!" />
I think the error message is enlightening:

value 'Hello World !' does not match any member types of the union

Notice the space before the '!' where the tab was previously.

Microsoft .Net runtime XML/XSD system reports it as valid.

I have tried adding whitespace=preserve to the "Hello" simple type definition:

  <xs:simpleType name="Hello">
    <xs:restriction base="xs:string">
      <xs:whiteSpace value="preserve"/>
      <xs:pattern value="Hello World&#x09;!"/>
    </xs:restriction>
  </xs:simpleType>

This does not help.