メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.398950740339 44.1778016635686, 142.397720379147 44.1776027489325, 142.397974794436 44.1767674488401, 142.399235686842 44.1769589722218, 142.398950740339 44.1778016635686)) ^^http://www.opengis.net/ont/geosparql#wktLiteral