SOA Ecosystem–Interconnected Principles, Patterns, and Frameworks - Applied SOA Patterns on the Oracle Platform - page 39

Authority Primarily addresses Latest release

W3C Reusability, Loose Coupling, and Discoverability, Composability http://www.w3.org/TR/wsdl20/

Web Services Description Language Version 2.0 ( WSDL 2.0 ) provides a model and an
XML format for describing web services. Description has abstract and concrete parts. In
the abstract part, we can define what messages can participate in which operations; conse-
quently, in request and response, we can define what fault message can be generated. The
concrete part binds operations with related messages to the physical service endpoint
shown as follows:

<!-- WSDL definition structure -->
<definitions name="cargoBooking"
targetNamespace="http://erikredshipping.com/booking/"
xmlns="http://schemas.xmlsoap.org/wsdl/">
<!-- abstract definitions -->
<types> ...
<message> ...
<portType> ...
<!-- concrete definitions -->
<binding> ...
<service> ...
</definition>

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WSDL is equally important for implementing the WS-* specification as SOAP. Practic-
ally, all elements can be linked to the WS policy statements, describing behavior, data re-
quirements, or QoS declarations. One of the most important pieces of information along
with the declared data models / types (XSD) and operations (via declared canonical ex-
pressions such as get , process , and so on) is to bind the message exchange pattern.