メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.404541397221 44.1829284990499, 142.402826518226 44.1826681171745, 142.400369282844 44.1822916823848, 142.400970026084 44.1810796603443, 142.401191630313 44.1806455343285, 142.402873993072 44.1809062658945, 142.403542185781 44.1809985231925, 142.405017381416 44.181202192749, 142.405055504469 44.1812084522593, 142.404541397221 44.1829284990499)) ^^http://www.opengis.net/ont/geosparql#wktLiteral