Declarative Extensions of XML Languages

We present a set of XML language extensions that bring notions from functional programming to web authors, extending the power of declarative modelling for the web. Our previous work discussed expressions and user-defined events. In this paper, we discuss how one may extend XML by adding definitions and parameterization; complex data and data types; and reactivity, events and continuous "behaviours". We consider these extensions in the light of World Wide Web Consortium standards, and illustrate their utility by a variety of use cases.