-const std::string STYLE_KEY( "style" );
-const std::string WEIGHT_KEY( "weight" );
-const std::string WIDTH_KEY( "width" );
-const std::string SLANT_KEY( "slant" );
-const std::string FAMILY_KEY( "family" );
-const std::string TYPE_KEY( "type" );
-
-const std::string SYSTEM_TOKEN( "system" );
+const std::string STYLE_KEY("style");
+const std::string WEIGHT_KEY("weight");
+const std::string WIDTH_KEY("width");
+const std::string SLANT_KEY("slant");
+const std::string FAMILY_KEY("family");
+const std::string TYPE_KEY("type");