メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.905018181011 43.4974098253502, 141.904768014574 43.4974505983001, 141.904429607834 43.4963013612961, 141.904476349843 43.4962949967421, 141.905208170179 43.4961890054004, 141.905394773276 43.496828059252, 141.905539832561 43.4973248231068, 141.905018181011 43.4974098253502)) ^^http://www.opengis.net/ont/geosparql#wktLiteral