メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.451150719659 43.0469728417826, 141.451308983402 43.0474502271169, 141.451288700929 43.0474539539303, 141.449568337748 43.047771157258, 141.449407783809 43.0472754677045, 141.449269654884 43.0468584948025, 141.449863275422 43.0467513110205, 141.450438813958 43.0466408334437, 141.45101691682 43.0465468270855, 141.451150719659 43.0469728417826)) ^^http://www.opengis.net/ont/geosparql#wktLiteral