メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.314121289995 42.2903807047871, 143.314667753188 42.2906130989669, 143.3138805395 42.2916176473477, 143.313331628079 42.2913863975795, 143.312683677904 42.2911132965146, 143.312729822893 42.2910518165007, 143.313456129824 42.290097779304, 143.314121289995 42.2903807047871)) ^^http://www.opengis.net/ont/geosparql#wktLiteral