IDL union type mapping
----------------------
Key: YOKO-203
URL: http://issues.apache.org/jira/browse/YOKO-203
Project: Yoko - CORBA Server
Issue Type: Bug
Components: Idl2Wsdl
Affects Versions: 1.0-incubating-M2
Reporter: Matteo Vescovi
Assigned To: Matteo Vescovi
Priority: Minor
According to the CORBA Binding for WSDL specification document, the mapping for
IDL unions differs from the CORBA to WSDL/SOAP Interworking Specification
(formal/03-11-02) in that IDL union maps to a pure xs:choice rather than to a
discriminated choice. Just as with the any in the previous point, what matters
to the application is the union value. The discriminator is required only in
unions in which discriminator values do not correspond to any union case
members, such that setting the discriminator to one of those values means that
only the discriminator is sent across the wire. Such cases are better handled
by nillable XML Schema types.
However, IDL unions are currently mapped according to the CORBA to WSDL/SOAP
Interworking Specification (formal/03-11-02).
Following is an example of the mapping mandated by the CORBA to WSDL/SOAP
Interworking Specification (formal/03-11-02):
module Example {
union myUnion switch (long) {
case 0: long l;
case 1: string str;
case 2:
case 3: float f;
default: octet o;
};
};
This union maps onto the following XML schema definition:
<xsd:complexType name="Example.myUnion">
<xsd:sequence>
<xsd:element name="discriminator" type="xsd:int" />
<xsd:choice>
<!-- case 0 -->
<xsd:element name="l" type="xsd:int"
minOccurs="0" maxOccurs="1" />
<!-- case 1 -->
<xsd:element name="str" type="xsd:string"
nillable="true" minOccurs="0" maxOccurs="1" />
<!-- case 2, 3 -->
<xsd:element name="f" type="xsd:float"
minOccurs="0" maxOccurs="1" />
<!-- default case -->
<xsd:element name="o" type="xsd:byte"
minOccurs="0" maxOccurs="1" />
</xsd:choice>
</xsd:sequence>
</xsd:complexType>
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