メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.937247219559 42.9395301108898, 142.936197754645 42.9401561562616, 142.936138047903 42.9401931570151, 142.935546611861 42.9396688603314, 142.935256880541 42.9394086802911, 142.935316076534 42.9393733718949, 142.935593515984 42.9392077702321, 142.936369440092 42.9387452712619, 142.937247219559 42.9395301108898)) ^^http://www.opengis.net/ont/geosparql#wktLiteral