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C

choice complex type

An XML Schema construct defined using the choice element to constrain the possible elements in a complex data type. When using a choice complex type, only one of the elements defined in the complex type can be present at a time.

client

An application or process that requests services from other applications known as servers. The server processes may be running on the same or a different machine. In the context of a SOA network, a client process is called a consumer or service consumer.

concrete contract

See physical contract.

consumer

The end user of a service, also called a client for that service. The more exact term in the context of a service-oriented network is service consumer.

contract

A description of the messages and formats accepted and generated by a service. A service's contract is specified in a WSDL document that defines the interface and all connection-related information for that interface. A WSDL contract contains two sets of components: logical (or abstract) and physical (or concrete).

The logical components of the contract are those that describe the data types, message formats, operations, and interfaces for the services defined in the contract. Logical components are specified with the WSDL elements types, message, portType, and operation.