zorba::ExternalFunction

#include <zorba/function.h>

The ExternalFunction class serves as the base of subclasses that represent the implementation/body of external functions. Instances of ExternalFunction must provide an evaluate method that serves as the implementation of the function. During its evaluation, an external function may or may not need to access the static and/or dynamic context of the invoking XQuery module. If the function implementation does need to access either context, the function is referred to as "contextual"; otherwise, it is "non-contextual".