A WSDL document is just a simple XML document.
It contains set of definitions to describe a web service.
WSDL breaks down Web services into three specific, identifiable elements that can be combined or reused once defined.
Three major elements of WSDL that can be defined separately and they are:
A WSDL document has various elements, but they are contained within these three main elements, which can be developed as separate documents and then they can be combined or reused to form complete WSDL files.
Following are the elements of WSDL document. Within these elements are further subelements, or parts:
In addition to these major elements, the WSDL specification also defines the following utility elements:
NOTE: WSDL parts usually are generated automatically using Web services-aware tools.
The WSDL Document Structure:
A WSDL document describes a web service using these major elements:
Element | Description |
---|---|
<types> | A container for data type definitions used by the web service |
<message> | A typed definition of the data being communicated |
<portType> | A set of operations supported by one or more endpoints |
<binding> | A protocol and data format specification for a particular port type |
The main structure of a WSDL document looks like this:
<definitions> <types> definition of types........ </types> <message> definition of a message.... </message> <portType> <operation> definition of a operation....... </operation> </portType> <binding> definition of a binding.... </binding> <service> definition of a service.... </service>
A WSDL document can also contain other elements, like extension elements and a service element that makes it possible to group together the definitions of several web services in one single WSDL document.
References
Wikipedia for WSDL
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