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[Bug 29441] [xslt3.0] Definition of "extension functions"

From: <bugzilla@jessica.w3.org>
Date: Tue, 09 Feb 2016 18:21:09 +0000
To: public-qt-comments@w3.org
Message-ID: <bug-29441-523-XBVOxQhu1b@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=29441

--- Comment #1 from Michael Kay <mike@saxonica.com> ---
Suggested definition, and elaboration:

[Definition: An extension function is a function that is available for use
within an XPath expression, other than a function defined directly or by
reference in this XSLT specification.] Extension functions typically are either
defined by the implementer of the XSLT processor, or by a user using
implementer-supplied APIs. 

The following are NOT classed as extension functions: core functions defined in
[Functions and Operators 3.0]; additional functions defined in this XSLT
specification; constructor functions named after an atomic type; stylesheet
functions defined using an xsl:function declaration; XPath 3.0 inline
functions; functions returned by (higher-order) functions such as
load-xquery-module and random-number-generator.

Functions returned as the result of evaluating a construct such as a named
function reference or a partial function application or a call on
function-lookup are classified as extension functions if the construct includes
a reference to an extension function. 

NOTE: 

It is possible in principle for named extension functions to be present in the
dynamic context even though they are not present in the static context, and
vice versa. This can arise, for example, when the environment in which a
stylesheet is executed differs from the environment in which it is compiled.

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