メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.351442363449 44.4790621248995, 142.350689946384 44.4789000209436, 142.351037425307 44.4781893765905, 142.351335785873 44.4775689497805, 142.352085434916 44.4777498616425, 142.351442363449 44.4790621248995)) ^^http://www.opengis.net/ont/geosparql#wktLiteral