メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.343914053901 43.7621775154888, 142.343629517188 43.7626645499541, 142.34230338384 43.7622520856263, 142.342587966403 43.7617823003975, 142.342925850319 43.7611961420348, 142.344263852408 43.761617203594, 142.343914053901 43.7621775154888)) ^^http://www.opengis.net/ont/geosparql#wktLiteral