メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.269115453673 44.0227406665896, 144.268331980192 44.0226720155687, 144.268305174031 44.0227550073482, 144.267425132602 44.0226663565771, 144.267536085066 44.0225186924351, 144.267611752476 44.0220895322635, 144.269214288109 44.0222192858154, 144.269115453673 44.0227406665896)) ^^http://www.opengis.net/ont/geosparql#wktLiteral