メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.900108524252 43.3348244259602, 141.900341435674 43.3356722562468, 141.899501626158 43.3359219236016, 141.898329117587 43.3362459692565, 141.898289044373 43.3362025942869, 141.897915379143 43.3349696984419, 141.897907708143 43.3349426684474, 141.89771595241 43.3343473760729, 141.899863894586 43.3340381699922, 141.900108524252 43.3348244259602)) ^^http://www.opengis.net/ont/geosparql#wktLiteral