void findRules(const std::string& type, const string_set& states, SymbolRuleVector& rules);
SymbolInstance* addSymbolInstance(const osg::Vec2& proj, double heading, SymbolDef* def, SGPropertyNode* vars);
void findRules(const std::string& type, const string_set& states, SymbolRuleVector& rules);
SymbolInstance* addSymbolInstance(const osg::Vec2& proj, double heading, SymbolDef* def, SGPropertyNode* vars);