メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.89743922259 43.4752684360961, 141.896310848456 43.4754570251153, 141.896280279296 43.4754621348258, 141.896133691715 43.4754787376848, 141.896951339799 43.4735701173461, 141.896996604115 43.4737681835634, 141.897149110779 43.4742538552666, 141.89743922259 43.4752684360961)) ^^http://www.opengis.net/ont/geosparql#wktLiteral