メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.399600715341 44.1783631884731, 142.398814893394 44.1782314547459, 142.398950740339 44.1778016635686, 142.399235686842 44.1769589722218, 142.40000245986 44.1770837155072, 142.399796577392 44.1777625194536, 142.399600715341 44.1783631884731)) ^^http://www.opengis.net/ont/geosparql#wktLiteral