[GROOVY-7874] When serializing a document with xmlUtil, namespaces that are actually necessary, are being dropped as "unused"

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 2.4.3, 2.4.6, 2.4.7
• Component/s: XML Processing
• Environment: MAC OS X, and Windows
• Assignee: Unassigned
• Reporter: Mike Cargal
• Created: 24/Jun/16 14:22
• Updated: 28/Jun/16 09:42

Description

The following code segment demonstrates parsing a schema and then serializing with xmlUtil. xmlUtil, in it's attempt to discard necessary namespaces, is discarding namespaces that are actually needed.

Save the original schema and the referenced schema in eclipse, and there will be no errors. Save the output schema (as MyRevSchema.xsd for example) and you'll have errors as a result of the dropped namespaces.

import groovy.xml.*

scSrc = '''<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    attributeFormDefault="unqualified" elementFormDefault="qualified"
    targetNamespace="urn:cargal.net/myNS" xmlns="urn:cargal.net/myNS"
    xmlns:myns="urn:cargal.net/myNS">
    <xsd:include schemaLocation="MyRefSchema.xsd" />
    <xsd:complexType name="myCT2">
        <xsd:complexContent>
            <xsd:extension base="myns:myCT">
                <xsd:sequence>
                    <xsd:element name="element1" />
                </xsd:sequence>
            </xsd:extension>
        </xsd:complexContent>
    </xsd:complexType>
    <xsd:element name="test" type="myns:myCT" />
    <xsd:element name="test2" substitutionGroup="subG" type="myCT2" />
</xsd:schema>
'''

schema = new XmlSlurper().parseText(scSrc)
println schema.lookupNamespace('')
println schema.lookupNamespace('myns')
println new XmlUtil().serialize(schema)

results:

urn:cargal.net/myNS
urn:cargal.net/myNS
<?xml version="1.0" encoding="UTF-8"?><xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="urn:cargal.net/myNS">
  <xsd:include schemaLocation="MyRefSchema.xsd"/>
  <xsd:complexType name="myCT2">
    <xsd:complexContent>
      <xsd:extension base="myns:myCT">
        <xsd:sequence>
          <xsd:element name="element1"/>
        </xsd:sequence>
      </xsd:extension>
    </xsd:complexContent>
  </xsd:complexType>
  <xsd:element name="test" type="myns:myCT"/>
  <xsd:element name="test2" substitutionGroup="subG" type="myCT2"/>
</xsd:schema>

For reference: MyRefSchema.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
	attributeFormDefault="unqualified" elementFormDefault="qualified"
	targetNamespace="urn:cargal.net/myNS" xmlns="urn:cargal.net/myNS"
	xmlns:myns="urn:cargal.net/myNS">
	<xsd:complexType name="myCT">
		<xsd:sequence>
			<xsd:element name="element1" />
		</xsd:sequence>
	</xsd:complexType>
	<xsd:element name="subG" type="myCT" />
</xsd:schema>