Working with Expressions
Most readers are familiar with expressions. 1+1=2, a2 + b2=c2, and if (a>b) then x are all examples of simple expressions. XSL supports expressions of surprising sophistication and power. In fact, XSLT derives much of its power from its expression language. Expressions allow developers to do several things, chief of which are
Selecting nodes to be further processed
Specifying conditions for processing nodes
Generating output text
There are five types of expressions:
Node Sets— Expressions that act on node sets. Node sets are just that, unordered collections of nodes generated by applying <xsl:template match="..."> and <xsl:apply-template select="...""> rules. We've been working with node sets all along but haven't known ...
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