メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.394160311849 44.1607874769096, 142.393167182279 44.1606241763319, 142.392323113758 44.160491480679, 142.391837267104 44.1604151186942, 142.392531448596 44.1582672236902, 142.392744988017 44.1583539928989, 142.394528802132 44.1590193740883, 142.39416250964 44.1607679266561, 142.394160311849 44.1607874769096)) ^^http://www.opengis.net/ont/geosparql#wktLiteral