Grouping Nodes
When grouping nodes, we sort things to get them into a
certain order, and then we group all items that have the same value for
the sort key (or keys). We’ll use xsl:sort for this grouping, and then use
variables or functions such as key() or generate-id() to finish the job.
[2.0] XSLT 2.0 has new elements and functions that make grouping much easier. If you’re using XSLT 2.0, feel free to skip ahead to the section [2.0] New Grouping Syntax in XSLT 2.0” later in this chapter.
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