メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.375568318831 43.7697559956716, 142.375870652931 43.7702922771474, 142.37432186679 43.7707476674918, 142.374031845452 43.7702124068855, 142.373735798108 43.7696761151207, 142.375265971027 43.7692106078653, 142.375568318831 43.7697559956716)) ^^http://www.opengis.net/ont/geosparql#wktLiteral