メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.434588817375 40.6832412181448, 141.434558432583 40.6833464932553, 141.431730054356 40.6828612247643, 141.432211501425 40.6812784491282, 141.432566172502 40.6800772536432, 141.435393624436 40.6805851619622, 141.43520915807 40.6811864350965, 141.434695522817 40.6828714141209, 141.434588817375 40.6832412181448)) ^^http://www.opengis.net/ont/geosparql#wktLiteral