メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.374634772109 43.7712849073771, 142.374915379514 43.7718027018196, 142.373427322698 43.7722427004683, 142.373154619678 43.771717071325, 142.372849051296 43.7711750213703, 142.373145812533 43.7710880696612, 142.37432186679 43.7707476674918, 142.374634772109 43.7712849073771)) ^^http://www.opengis.net/ont/geosparql#wktLiteral