\
        Issues events to create an occurrence.

        `value`
            The string value
        `typ`
            The occurrence type
        `datatype`
            The datatype (default: xsd:string)

def _occ(self, value, typ, datatype=None):
        """\
        Issues events to create an occurrence.

        `value`
            The string value
        `typ`
            The occurrence type
        `datatype`
            The datatype (default: xsd:string)
        """
        self._handler.occurrence(typ, value, datatype)