メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.330782866741 43.7536334949006, 142.331536848608 43.7538610844026, 142.330894574108 43.7549726814961, 142.330138778068 43.7547359307804, 142.329528469679 43.7545421634303, 142.330164492457 43.7534408965568, 142.330782866741 43.7536334949006)) ^^http://www.opengis.net/ont/geosparql#wktLiteral