メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.378579389301 43.7688833870229, 142.378883574941 43.7694183383436, 142.377382639413 43.7698411948124, 142.377090744301 43.7693081405946, 142.376793762349 43.7687657760547, 142.378289378711 43.7683346730569, 142.378579389301 43.7688833870229)) ^^http://www.opengis.net/ont/geosparql#wktLiteral