メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.328911891642 43.7860188705302, 142.328947042424 43.7859827546425, 142.329486140659 43.7863360966505, 142.329788410531 43.7862463681842, 142.330371122676 43.7866312153254, 142.329368904754 43.787343228489, 142.329234265287 43.7874438980599, 142.328244606539 43.7867386432678, 142.323954754906 43.7834154774415, 142.324393663452 43.7828643823316, 142.328911891642 43.7860188705302)) ^^http://www.opengis.net/ont/geosparql#wktLiteral