メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.087716674809 43.7906745563098, 144.083074438378 43.7920948544784, 144.079996154792 43.7870757671277, 144.084757832981 43.7855915295194, 144.087716674809 43.7906745563098)) ^^http://www.opengis.net/ont/geosparql#wktLiteral