メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.817870678129 35.3926347069282, 136.819397562135 35.3929597002076, 136.819079287997 35.3939658017711, 136.81888645408 35.3945573442671, 136.817571584096 35.3942611915016, 136.816943609752 35.3941248840709, 136.816309315325 35.3939791898598, 136.816842394293 35.3924176755967, 136.817870678129 35.3926347069282)) ^^http://www.opengis.net/ont/geosparql#wktLiteral