Aggregation is one of the most useful facilities of Cocoon and Paloose. It takes several XML documents and aggregates them into a single XML document with appropriate enclosing tags for each part. Within the <map:aggregate> element there are a number of <map:part> elements that define which XML documents should be aggregated together. A working example is given here.

The <map:aggregate> element has a single attribute

Each <map:part> element has a number of attributes that control how each part is to be included:

As an example of aggregation consider the following extract from the Paloose site (note the use of an internal only pipeline):

<map:pipelines> <map:pipeline> <map:match pattern="**.html"> <map:aggregate element="root" > <map:part src="cocoon:/headings.xml" element="headings" strip-root="true"/> <map:part src="cocoon:/menus.xml" element="menus" strip-root="true"/> <map:part src="cocoon:/newsArticles.xml" element="news-articles" strip-root="true"/> <map:part src="cocoon:/{1}.xml" element="content" strip-root="true"/> </map:aggregate> ... </map:match> </map:pipeline> <map:pipeline internal-only="true"> <map:match pattern="menus.xml"> <map:generate src="context://content/menus.xml"/> <map:serialize/> </map:match> <map:match pattern="headings.xml"> <map:generate src="context://content/headings.xml"/> <map:serialize/> </map:match> <map:match pattern="newsArticles.xml"> <map:generate src="context://content/newsArticles.xml"/> <map:serialize/> </map:match> <map:match pattern="**.xml"> <map:generate src="context://content/{1}.xml"/> <map:serialize/> </map:match> </map:pipeline> </map:pipelines>

This will produce an aggregated document:

<?xml version="1.0"?> <root> <headings> ... </headings> <menus> ... </menus> <news-articles> ... </news-articles> <content> ... </content> </root>
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