メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.039354322357 42.9200970476744, 143.03863388919 42.9200489024056, 143.038586191753 42.9200456437093, 143.03875879442 42.9188770881694, 143.039511183114 42.9189409075212, 143.039416443944 42.9196337669319, 143.039354322357 42.9200970476744)) ^^http://www.opengis.net/ont/geosparql#wktLiteral