This work is a continuation of previous, published joint work towards a set of XML language extensions that bring tools from the functional programming world to web authors, extending the power of declarative modeling for the web. Our previous work concentrated on two aspects, expressions and user-defined events, and deliberately left aside other questions regarding data types, encapsulation and so forth. Work addressed here includes the addition of various facilities to XML languages including definitions and parameterization; complex data and data types; reactivity, events and continuous ''behaviours''. We have considered these extensions in the light of existing and emerging World Wide Web Consortium standards.
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