メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.398911858596 44.1854097185971, 142.398608475226 44.1853602071486, 142.398121587858 44.1852807485559, 142.398370962699 44.1845487500573, 142.399421858434 44.1847107972982, 142.399415370917 44.184725184921, 142.399272139442 44.1851668521405, 142.398911858596 44.1854097185971)) ^^http://www.opengis.net/ont/geosparql#wktLiteral