SOA Glossary - required extension (WSDL)

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This glossary supports the following titles:

SOA Governance

SOA with .NET & Azure

SOA Design Patterns

Web Service Contract Design & Versioning for SOA

SOA Principles of Service Design

Service-Oriented Architecture: Concepts, Technology, and Design

Modern SOA Infrastructure: Technology, Design, and Governance

SOA with REST: Principles, Patterns & Constraints

Next Generation SOA: A Real-World Guide to Modern Service-Oriented Computing

SOA with Java

SOA Security: Practices, Patterns, and Technologies for Securing Services

SOA and Cloud Computing: Practices, Patterns, Technologies

This glossary also supports the SOA Certified Professional (SOACP) program.

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required extension (WSDL)

(contributed by Hugo Haas)

A WSDL extension is considered as required if a WSDL definition cannot be processed without understanding it. This means that declarations appearing in a WSDL document that pertain to this extension cannot be ignored.

It is declared as required by decorating one of the elements defined by such an extension that appears in a WSDL document with a wsdl:required="true" attribute.

The following example demonstrates the application of this feature using the wsdl:required attribute. This example is from Chapter 14 of the book Web Service Contract Design and Versioning for SOA: