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2.3. Adding data units to a contract
Overview
Depending on how you choose to create your WSDL contract, creating new data definitions requires varying amounts of knowledge. The Apache CXF GUI tools provide a number of aids for describing data types using XML Schema. Other XML editors offer different levels of assistance. Regardless of the editor you choose, it is a good idea to have some knowledge about what the resulting contract should look like.
Procedure
Defining the data used in a WSDL contract involves the following steps:
- Determine all the data units used in the interface described by the contract.
- Create a
typeselement in your contract. - Create a
schemaelement, shown in Example 2.1, “Schema entry for a WSDL contract”, as a child of thetypeelement.ThetargetNamespaceattribute specifies the namespace under which new data types are defined. The remaining entries should not be changed.Example 2.1. Schema entry for a WSDL contract
<schema targetNamespace="http://schemas.iona.com/bank.idl" xmlns="http://www.w3.org/2001/XMLSchema" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"> - For each complex type that is a collection of elements, define the data type using a
complexTypeelement. See Section 2.5.1, “Defining data structures”. - For each array, define the data type using a
complexTypeelement. See Section 2.5.2, “Defining arrays”. - For each complex type that is derived from a simple type, define the data type using a
simpleTypeelement. See Section 2.5.4, “Defining types by restriction”. - For each enumerated type, define the data type using a
simpleTypeelement. See Section 2.5.5, “Defining enumerated types”. - For each element, define it using an
elementelement. See Section 2.6, “Defining elements”.
