メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.983801233814 34.6783888136877, 137.982379072157 34.6786715529965, 137.98225519146 34.6783577593006, 137.98346340121 34.6781024291188, 137.983537251993 34.6782841672874, 137.983752418162 34.6782391568213, 137.983801233814 34.6783888136877)) ^^http://www.opengis.net/ont/geosparql#wktLiteral