メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.7875000 35.5291667, 137.7937500 35.5291667, 137.7937500 35.5333333, 137.7875000 35.5333333, 137.7875000 35.5291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral