IBM Version 5 manual Matchers and selectors conditional processing, Sitemap

Matchers and selectors: conditional processing

Conditional statements are part of any programming language. Output can be dependent on many factors, such as the users’ browser, request parameters, or operating system.

Matchers are the equivalent of If statements. If a condition is true, then a section of a pipeline is processed, or otherwise is passed by.

A selector is used when there are few options available, and it is similar to an If-then-else statement. These are used to create conditional sections in the pipeline, while matchers are used to test if a particular pipeline is to be processed.

	SAX	SAX
File Generator		FileSerializer
	FileTransformer
request		reponse
HTML	XSL StyleSheet	HTML, PDF, etc

Figure 2-3 Cocoon components

Sitemap

The Cocoon sitemap fulfills two functions:

￿Components (matchers, generators, serializers, transformers, etc.) are declared here before being used in pipelines.

￿Where pipelines are declared using the declared components.

It consists of configuration data for the Cocoon engine.

Example 2-14 Sample sitemap for Cocoon

<map:match pattern=”airline.html””> <map:generate src=”docs/flight_data.xml”/> <map:transform src=stylesheets/page/airline.xsl”/> <map:serialize type=”html”/>

</map:match>

Chapter 2. Technologies in XML 51