メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.90502228037 43.4716522223248, 141.904933078827 43.4716655622762, 141.904352013824 43.4717600559581, 141.9041553945 43.4711369178542, 141.904715680693 43.4710446482076, 141.904725804099 43.4710429908191, 141.904820171849 43.4710295252054, 141.90502228037 43.4716522223248)) ^^http://www.opengis.net/ont/geosparql#wktLiteral