XSLT 2.0 and XPath 2.0 Programmer's Reference, 4th Edition (32 page)

Example: Push Processing

This example demonstrates the push processing technique: a rule-based stylesheet in which there is one template rule to process each different kind of node.

Input

The source document,
books.xml
, is a simple book catalog:

Stylesheet

Say you want to display this data in the form of a sequentially numbered booklist. The following stylesheet,
books.xsl
, will do the trick:

What's happening here? There's no template rule for the document node, so the built-in template gets invoked. This processes all the children of the document node.

There's only one child of the document node, the

element. So the template rule for the

element is evaluated. This creates some standard HTML elements on the result tree, and eventually calls

to cause its own children to be processed. These children are all

elements, so they are all processed by the template rule whose match pattern is
match=“book”
. This template rule outputs an HTML

element, and within it a

element, which it fills by executing the

instruction whose effect is to get the sequence number of the current node (the

element) within its parent element. It then calls

once again to process the children of the

element in the source tree.

The children of the

element in the source document are all

,