メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.395825105492 44.174658101063, 142.394503249709 44.1744462018935, 142.394843263483 44.1732958678603, 142.396182558548 44.1735072676324, 142.395825105492 44.174658101063)) ^^http://www.opengis.net/ont/geosparql#wktLiteral