メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.278449655757 43.0837792367027, 141.279398779921 43.0846190664833, 141.278792770988 43.0849757733731, 141.277829915072 43.0841368770574, 141.277404482678 43.0837599573084, 141.277024145652 43.0834258280328, 141.276581821879 43.0830498165198, 141.27692358363 43.0828505242886, 141.277230404305 43.0826762528523, 141.278449655757 43.0837792367027)) ^^http://www.opengis.net/ont/geosparql#wktLiteral