11.3. The Boolean XSLT Function Group
The Boolean XSLT function group addresses a circumstance that might well have crossed your mind. Specifically, if XSLT is extensible and different XSLT processors have their own specific extension elements and functions, what happens when an extension from one processor is called in an XSLT stylesheet being run on another processor that doesn't support that extension? Further, if this can and sometimes does generate an error that terminates the processing of the given XSLT stylesheet, is it possible to prepare in advance for this eventuality?
Many things in XSLT are contingent on which processor you are using, and the Boolean functions for XSLT are quite essential if your stylesheets are to be used in multiple ...
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