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WSDL Which WSDL Style ?

WSDL Which WSDL Style ?. 17 th October 2004. www.eu-egee.org. 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);.

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WSDL Which WSDL Style ?

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  1. WSDLWhich WSDL Style ? 17th October 2004 www.eu-egee.org 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 WSDL, 17th October 2004 - 2

  3. Java method example public void myMethod (int x); WSDL, 17th October 2004 - 3

  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 WSDL, 17th October 2004 - 4

  5. SOAP message <soap:envelope> <soap:body> <myMethod> <x xsi:type=“xsd:int”>value</x> </myMethod> </soap:body> </soap:envelope> WSDL, 17th October 2004 - 5

  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 WSDL, 17th October 2004 - 6

  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 WSDL, 17th October 2004 - 7

  8. SOAP message <soap:envelope> <soap:body> <myMethod> <x>value</x> </myMethod> </soap:body> </soap:envelope> WSDL, 17th October 2004 - 8

  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 WSDL, 17th October 2004 - 9

  10. Document/encoded • Not implemented ! WSDL, 17th October 2004 - 10

  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> WSDL, 17th October 2004 - 11

  12. SOAP message <soap:envelope> <soap:body> <xElement>value</xElement> </soap:body> </soap:envelope> WSDL, 17th October 2004 - 12

  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 WSDL, 17th October 2004 - 13

  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 WSDL, 17th October 2004 - 14

  15. SOAP message <soap:envelope> <soap:body> <myMethod> <x>value<x> </myMethod> </soap:body> </soap:envelope> WSDL, 17th October 2004 - 15

  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 WSDL, 17th October 2004 - 16

  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. WSDL, 17th October 2004 - 17

  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. WSDL, 17th October 2004 - 18

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