メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.904768014574 43.4974505983001, 141.903993909257 43.4975787872059, 141.903649340252 43.4964074125852, 141.904429607834 43.4963013612961, 141.904768014574 43.4974505983001)) ^^http://www.opengis.net/ont/geosparql#wktLiteral