#include <DbXml.hpp>

virtual XmlExternalFunction *XmlResolver::resolveExternalFunction(
    XmlTransaction *txn, XmlManager &mgr, const std::string &uri,
    const std::string &name, size_t numberOfArgs) const

When implemented this method resolves a unigue combination of function URI, function name and number of arguments into an instance of XmlExternalFunction used to implement an XQuery extension function. If the URI, name and arguments cannot be resolved NULL is returned. It may return a singleton or a new instance. Memory management of the returned object depends on the implementation of the XmlResolver and the XmlExternalFunction instance. Singletons are usually owned by XmlResolver while new instances must be deleted by XmlExternalFunction::close.

• If a transaction is in force, a pointer to the XmlTransaction object; otherwise, NULL.

• The XmlManager object associated with the operation.

• The URI of the XQuery function being resolved.

• The string name of the XQuery function being resolved.

• The number of arguments passed to the XQuery function being resolved.