メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.394741668235 44.1846080802339, 142.394712715771 44.1846011719571, 142.393861040585 44.1844665851248, 142.392813492498 44.1843057778433, 142.393007656479 44.1836986191564, 142.393014300024 44.1836778503655, 142.393459888466 44.1837553287975, 142.393836764305 44.1837808381694, 142.394944993346 44.1839642011854, 142.394741668235 44.1846080802339)) ^^http://www.opengis.net/ont/geosparql#wktLiteral