メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.971964475783 43.5457226620151, 144.971558977048 43.5455026984324, 144.971512419208 43.5454735003352, 144.971152046975 43.5452637471124, 144.971751434507 43.5447747823664, 144.972119735852 43.5450146521251, 144.972521721864 43.5452811414008, 144.971964475783 43.5457226620151)) ^^http://www.opengis.net/ont/geosparql#wktLiteral