14.2. Template Concepts
Mozilla's template system extends all the standard features of Mozilla applications: XUL, JavaScript, and RDF. There is also the matter of data sources. These extensions are explained and then tied together with an example.
14.2.1. RDF Queries and Unification
The XUL template system is a query system. It searches through data and returns the items that match the search specification. The data searched through is a set of RDF facts. A template query is therefore an RDF-specific piece of processing.
The queries that XUL templates do are often described as a pattern-matching system. In the most general computer science sense, this is true, but pattern matching also has a simple, everyday meaning. That everyday meaning is ...
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