Execute an XPath function object.
The function must return a valid object. Extension functions should override this version of execute(), rather than one of the other calls designed for a specific number of arguments, since the extension function mechanism will call this version first. Extension functions that accept more than three arguments _must_ override this version.
- Parameters:
-
| executionContext | executing context |
| context | current context node |
| args | vector of pointers to XObject arguments |
| locator | LocatorType instance for the XPath expression that contains the function call |
- Returns:
- pointer to the result XObject
Reimplemented from Function. |