メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.402957649128 44.1689681384473, 142.401711242472 44.168785348762, 142.401757457592 44.1686405920544, 142.402167824588 44.1671812111901, 142.402957649128 44.1689681384473)) ^^http://www.opengis.net/ont/geosparql#wktLiteral