メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.371095797821 43.7761373128123, 142.371231436515 43.7763769511027, 142.37153546296 43.7769135754732, 142.370883391098 43.7771101189335, 142.370245285039 43.7773032698671, 142.369791626187 43.7765101403179, 142.369800273153 43.7765082510573, 142.369443010683 43.7758270256292, 142.369964927436 43.7756947930311, 142.370561330194 43.7755398884162, 142.370729260567 43.775481399626, 142.371095797821 43.7761373128123)) ^^http://www.opengis.net/ont/geosparql#wktLiteral