メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.469452969742 34.1448885350439, 131.469374106575 34.1452126599259, 131.46877449032 34.1451908066219, 131.468794130613 34.1447291338743, 131.468905005443 34.1447561072088, 131.469053915051 34.1447885072498, 131.469452969742 34.1448885350439)) ^^http://www.opengis.net/ont/geosparql#wktLiteral