Extension Functions
In XSLT 1.0, W3C defined the way to differentiate extension functions from built-in functions by requiring that namespace-qualified names be used to reference extension functions, as in starpowder:calculate(). XSLT 1.0 also provided the function-available()function to test for the availability of a function by name.
The XSLT 1.1 working draft put some additional restrictions on extension functions:
Extension functions must work like built-in functions.
Language bindings must be provided for Java and ECMAScript.
It must be possible to extend the mechanism naturally to support other languages in the future.
A processor should not be required to implement the portable extension function binding for any particular language.
A processor ...
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