メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.377382639413 43.7698411948124, 142.375870652931 43.7702922771474, 142.375568318831 43.7697559956716, 142.377090744301 43.7693081405946, 142.377382639413 43.7698411948124)) ^^http://www.opengis.net/ont/geosparql#wktLiteral