Built-in extensions
Nearly all the extension functions provided in the Java product in the saxon namespace are available.
         The exceptions are:
saxon:key-mapsaxon:last-modifiedsaxon:parse-dateTimesaxon:send-mailsaxon:object-mapsaxon:unparsed-entities
It is possible to wrap an external C# object in an XdmExternalObject. However, the external object lookup expression (a Saxon extension) is not available.
Status for extension functions in other namespaces: