メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.955572012256 38.8609591190815, 139.955361634096 38.8606299852491, 139.955482407486 38.860580922485, 139.955440963037 38.8604959431812, 139.956199384477 38.8601630389363, 139.95635251108 38.8602135964171, 139.956400921418 38.8603986391614, 139.956448736741 38.8606101405921, 139.955572012256 38.8609591190815)) ^^http://www.opengis.net/ont/geosparql#wktLiteral