When using DatatypeDocumentFactory, I was surprised to find that named
simple type definitions are only considered valid if nested. As far as I
can tell there's no reference to this in the documentation. Have I
overlooked something and, if not, are there any plans to address this
restriction?
// When doing this:
setDocumentFactory(DatatypeDocumentFactory.getInstance());
Dom4J's SchemaParser considers this to be valid:
<!---------------------------------------------->
<xs:complexType name="NamedAttributeTesterType">
<xs:sequence>
<xs:element name="foo" type="xs:string" minOccurs="0"/>
</xs:sequence>
<xs:attribute name="kind" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="element"/>
<xs:enumeration value="list"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:complexType>
<!---------------------------------------------->
But not this:
<!---------------------------------------------->
<xs:simpleType name="NamedAttributeType">
<xs:restriction base="xs:string">
<xs:enumeration value="element"/>
<xs:enumeration value="list"/>
</xs:restriction>
</xs:simpleType>
<xs:complexType name="NamedAttributeTesterType">
<xs:sequence>
<xs:element name="foo" type="xs:string" minOccurs="0"/>
</xs:sequence>
<xs:attribute name="kind" type="NamedAttributeType" use="required"/>
</xs:complexType>
<!---------------------------------------------->
While I'm not crazy about the restriction, I can do something about it in my
own schemas. Unfortunately it creates a problem when I'm attemting to
reference named types declared in other schemas. For example:
<!---------------------------------------------->
<xs:import namespace="http://www.w3.org/XML/1998/namespace";
schemaLocation="http://www.w3.org/2001/03/xml.xsd"/>
<xs:complexType name="ReferencedAttributeTesterType">
<xs:sequence>
<xs:element name="foo" type="xs:string" minOccurs="0"/>
</xs:sequence>
<xs:attribute ref="xml:base"/>
</xs:complexType>
<!---------------------------------------------->
// Failure occurs here. Comments mine
protected XSDatatype dataTypeForXsdAttribute( Element xsdAttribute ) {
String type = xsdAttribute.attributeValue( "type" );
XSDatatype dataType = null;
// named type returns NamedAttributeTesterType and
// then never checks simpleType
if ( type != null ) {
dataType = getTypeByName( type );
}
else {
// only alternative is to next the type definition
// then it works.
Element xsdSimpleType = xsdAttribute.element( XSD_SIMPLETYPE );
if ( xsdSimpleType == null ) {
String name = xsdAttribute.attributeValue( "name" );
throw new InvalidSchemaException(
"The attribute: " + name + " has no type attribute and does not
contain a <simpleType/> element"
);
}
dataType = loadXSDatatypeFromSimpleType( xsdSimpleType );
}
return dataType;
}
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