メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.289395477175 42.2914012320915, 143.28301767396 42.2931003498249, 143.281803856401 42.2907336971504, 143.288091069664 42.2889537372059, 143.289395477175 42.2914012320915)) ^^http://www.opengis.net/ont/geosparql#wktLiteral