メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.531624534651 44.0651531788084, 143.531126329303 44.0653128777185, 143.530728939509 44.0654446417999, 143.529830612511 44.0639671061584, 143.530202626701 44.0638438668877, 143.531583191488 44.0633774810049, 143.532483200305 44.0648816242158, 143.53230414555 44.0649355019298, 143.531624534651 44.0651531788084)) ^^http://www.opengis.net/ont/geosparql#wktLiteral