メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.394758644149 44.1634277318242, 142.393450643589 44.1632197044064, 142.393788114314 44.1620631097482, 142.394124486279 44.1621231436782, 142.39511003527 44.1622715926112, 142.394758644149 44.1634277318242)) ^^http://www.opengis.net/ont/geosparql#wktLiteral