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WSDL Which WSDL Style ?

www.eu-egee.org. WSDL Which WSDL Style ?. EGEE is a project funded by the European Union under contract IST-2003-508833. Types of WSDL SOAP binding. RPC/encoded RPC/literal Document/encoded Document/literal. Java method example. public void myMethod (int x);. RPC/Encoded WSDL.

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WSDL Which WSDL Style ?

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  1. www.eu-egee.org WSDLWhich WSDL Style ? EGEE is a project funded by the European Union under contract IST-2003-508833

  2. Types of WSDL SOAP binding • RPC/encoded • RPC/literal • Document/encoded • Document/literal

  3. Java method example public void myMethod (int x);

  4. RPC/Encoded WSDL <message name=“myMethodRequest”> <part name=“x” type=“xsd:int”/> </message> <message name=“empty”/> <portType name=“PT”> <operation name=“myMethod”> <input message=“myMethodRequest”/> <output message=“empty”/> </operation> </portType> Binding is RPC/encoded

  5. SOAP message <soap:envelope> <soap:body> <myMethod> <x xsi:type=“xsd:int”>value</x> </myMethod> </soap:body> </soap:envelope>

  6. Advantages/disadvantages • Advantages • Simple WSDL • Operation name appears in the message • Disadvantages • Type encoding information overhead • SOAP message cannot be validated except against WSDL

  7. RPC/Literal WSDL <message name=“myMethodRequest”> <part name=“x” type=“xsd:int”/> </message> <message name=“empty”/> <portType name=“PT”> <operation name=“myMethod”> <input message=“myMethodRequest”/> <output message=“empty”/> </operation> </portType> Binding is RPC/literal

  8. SOAP message <soap:envelope> <soap:body> <myMethod> <x>value</x> </myMethod> </soap:body> </soap:envelope>

  9. Advantages/Disadvantages • Advantages • WSDL is simple • Operation name appears in the message • Type encoding information is minimal • Disadvantages • Nearly all the definitions in WSDL so not independently validatable

  10. Document/encoded • Not implemented !

  11. Document/literal WSDL <types> <schema> <element name=“xElement” type=“xsd:int”/> </schema> </types> <message name=“myMethodRequest”> <part name=“x” element=“xElement”/> </message> <message name=“empty”/> <portType name=“PT”> <operation name=“myMethod”> <input message=“myMethodRequest”/> <output message=“empty”/> </operation> </portType>

  12. SOAP message <soap:envelope> <soap:body> <xElement>value</xElement> </soap:body> </soap:envelope>

  13. Advantages/Disadvantages • Advantages • No type encoding information • The body of the soap message is all defined in a schema and so can be validated independently • Disadvantages • WSDL is more complicated • Operation name is lost

  14. Document/wrapped WSDL <types> <schema> <element name=“myMethod”/> <complexType> <sequence> <element name=“x” type=“xsd:int”/> </sequence> </complexType> </element> </schema> <types> <message name=“myMethodRequest”> <part name=“parameters” element=“myMethod”/> </message> <message name=“empty”/> <portType name=“PT”> <operation name=“myMethod”> <input message=“myMethodRequest”/> <output message=“empty”/> </operation> </portType> WSDL schema has a wrapper around the parameters

  15. SOAP message <soap:envelope> <soap:body> <myMethod> <x>value<x> </myMethod> </soap:body> </soap:envelope>

  16. Characteristics • Input message has a single part • Part is an element • Element has the same name as the operation • Element’s complex type has no attributes

  17. Advantages/disadvantages • Advantages • No type encoding information • Soap body is defined in a schema – validation • Method name in the soap message • Disadvantages • WSDL is complicated • Generally this is the best style to use.

  18. When not to use document/wrapped • Document literal wrapped style does not allow for overloading • Cannot have two elements with the same name in XML (element has to have same name as operation) • In this case you may wish to use RPC/literal so that the operation name is available.

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