def parse_uri(value):
        """ Parses a value into a head and tail pair based on the finding the
            last '#' or '/' as is standard with URI fromats

        args:
            value: string value to parse

        returns:
            tuple: (lookup, end)
        """
        value = RdfNsManager.clean_iri(value)
        lookup = None
        end = None

        try:
            lookup = value[:value.rindex('#')+1]
            end = value[value.rindex('#')+1:]
        except ValueError:
            try:
                lookup = value[:value.rindex('/')+1]
                end = value[value.rindex('/')+1:]
            except ValueError:
                try:
                    lookup = value[:value.index(':')]
                    end = value[value.rindex(':')+1:]
                except ValueError:
                    try:
                        lookup = value[:value.index('_')]
                        end = value[value.index('_')+1:]
                    except ValueError:
                        lookup = value
                        end = ""

        return (lookup, end)
Parses a value into a head and tail pair based on the finding the
            last '#' or '/' as is standard with URI fromats

        args:
            value: string value to parse

        returns:
            tuple: (lookup, end)