def _validate_danglers(self):
for query, warning in zip(DANGLER_QUERIES, DANGLER_WARNINGS):<EOL><INDENT>dangler_count = self.gtfs.execute_custom_query(query).fetchone()[<NUM_LIT:0>]<EOL>if dangler_count > <NUM_LIT:0>:<EOL><INDENT>if self.verbose:<EOL><INDENT>print(str(dangler_count) + "<STR_LIT:U+0020>" + warning)<EOL><DEDENT>self.warnings_container.add_warning(warning, self.location, count=dangler_count)<EOL><DEDENT><DEDENT>
Checks for rows that are not referenced in the the tables that should be linked

stops <> stop_times using stop_I
stop_times <> trips <> days, using trip_I
trips <> routes, using route_I
:return: