Web Services
Contents
WSDL Documents
An WSDL document describes a web service. It specifies the location of the service, and the methods of the service, using these major elements:
Element Description
<types> Defines the (XML Schema) data types used by the web service
<message> Defines the data elements for each operation
<portType> Describes the operations that can be performed and the messages involved.
<binding> Defines the protocol and data format for each port typeSOAP
SOAP - Message Structure
A SOAP message is an ordinary XML document containing the following elements −
Envelope − Defines the start and the end of the message. It is a mandatory element.
Header − Contains any optional attributes of the message used in processing the message, either at an intermediary point or at the ultimate end-point. It is an optional element.
Body − Contains the XML data comprising the message being sent. It is a mandatory element.
Fault − An optional Fault element that provides information about errors that occur while processing the message.
