メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.132908793311 42.6979620670824, 143.13165304547 42.6984518307948, 143.131604789052 42.6983839772042, 143.130978118517 42.6975075092511, 143.132207297317 42.697027945832, 143.132858183128 42.6978895912189, 143.132908793311 42.6979620670824)) ^^http://www.opengis.net/ont/geosparql#wktLiteral