Various XPDLs (XPath Derived Languages) offer many high-level abstractions which should enable us to write portable code for standards compliant processors. Unfortunately the reality is that even moderately complex applications often need to call additional functions which are non-standard and typically implementation provided. These implementation provided extension functions reduce both the portability and applicability of code written using standard XPDLs. This paper examines the relevant existing body of work and proposes a novel approach to the implementation of portable extension functions for XPDLs.
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