メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.394547860734 43.0888569744765, 141.39396350427 43.0890763104946, 141.392994843598 43.0894670331907, 141.392353814356 43.0897445191293, 141.392161528146 43.0893792747558, 141.391946808616 43.0889715248879, 141.391757143707 43.0886044708801, 141.393173136344 43.0880349657991, 141.393742304575 43.0878032140315, 141.394547860734 43.0888569744765)) ^^http://www.opengis.net/ont/geosparql#wktLiteral