メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.742670184723 35.4134133102812, 136.742613091259 35.4135405371539, 136.742527704815 35.4136828044083, 136.742476651321 35.4137733975344, 136.741341918454 35.4133747724655, 136.741443350927 35.4130435537453, 136.741466953454 35.4130043417569, 136.742670184723 35.4134133102812)) ^^http://www.opengis.net/ont/geosparql#wktLiteral