メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.385491885506 42.9895480443556, 144.385290689971 42.9896247340604, 144.385179381946 42.9896526231389, 144.38433619121 42.9898794973874, 144.38413133287 42.9893249162354, 144.385491885506 42.9895480443556)) ^^http://www.opengis.net/ont/geosparql#wktLiteral