Table of contents

Appendices

3 Predefined Features

Web Services Description Language (WSDL) features (hereafter 'features') define pieces of extended functionality which typically affect message exchanges. Examples may include "reliability", "security", or "correlation", among others. Features may be self-contained, or may be abstract, and thus expressed via bindings or SOAP modules. These components may expose settable properties, named variables which affect the behavior of one or more features, bindings or SOAP modules.

Features may change the behavior described for other components. In particular, note that a feature (or any other extension) may change the semantics of a message exchange pattern in some fashion, such as nominating an address for the delivery of faults, etc.

The Web Services Description Working Group provides the following predefined features and SOAP modules for two reasons - first, we encourage implementors to support these features as we believe they offer important functionality. Second, these specifications act as a model of how to write feature/module specs. Some further (SOAP-specific) examples can be found in the SOAP 1.2 spec, part 2.