メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((134.8875000 35.4208334, 134.8937500 35.4208334, 134.8937500 35.4250000, 134.8875000 35.4250000, 134.8875000 35.4208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral