メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.312900610635 42.2898615241854, 143.313456129824 42.290097779304, 143.312729822893 42.2910518165007, 143.312683677904 42.2911132965146, 143.312101570413 42.2908679995701, 143.311412127592 42.2905774090248, 143.311478588259 42.2904901382166, 143.312209321746 42.2895675792036, 143.312900610635 42.2898615241854)) ^^http://www.opengis.net/ont/geosparql#wktLiteral