メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.408235320624 36.8156489897017, 137.40850278493 36.8175365517704, 137.407204037959 36.8176308575933, 137.407179815739 36.8175081168032, 137.407129657628 36.8173183280194, 137.407039378555 36.8164137827601, 137.406989557095 36.8157907799908, 137.406987826799 36.8157693094669, 137.407792202108 36.8156973457491, 137.408235320624 36.8156489897017)) ^^http://www.opengis.net/ont/geosparql#wktLiteral