A uniform programmning language for implementing XML standards. We propose X-Fun, a core language for implementing various XML standards in a uniform manner. X-Fun is a higher-order functional programming language for transforming data trees based on node selection queries. It can support the XML data model and XPath queries as a special case. We present a lean operational semantics of X-Fun based on a typed lambda calculus that enables its in-memory implementation on top of any chosen path query evaluator. We also discuss compilers from XSLT, XQuery and XProc into X-Fun which cover the many details of these standardized languages. As a result, we obtain in-memory implementations of all these XML standards with large coverage and high efficiency in a uniform manner from SaXON’s XPath implementation.

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  1. Labath, Pavel; Niehren, Joachim: A uniform programmning language for implementing XML standards (2015)