メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.402286095385 43.7447190764318, 142.402350931728 43.7452145466816, 142.400372086643 43.7453369650693, 142.399075518533 43.7453872366027, 142.398288896012 43.7454389487682, 142.398262133527 43.7452256097931, 142.398243931762 43.7449341153936, 142.398204984193 43.7444552407784, 142.400270546603 43.7443484292538, 142.401132951848 43.7443092790711, 142.402247790754 43.7442427508167, 142.402286095385 43.7447190764318)) ^^http://www.opengis.net/ont/geosparql#wktLiteral