メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.780046885108 43.2113496592095, 141.780935637378 43.2117908855405, 141.780275988638 43.2124739599403, 141.779424526348 43.2120406162282, 141.779206250225 43.2119421026753, 141.778977651312 43.2114546274825, 141.779360331203 43.2110107391794, 141.780046885108 43.2113496592095)) ^^http://www.opengis.net/ont/geosparql#wktLiteral