+ /// Allows to set expression (text) error (by the parameters listener)
+ MODELAPI_EXPORT virtual void setExpressionError(const std::string& theError) = 0;
+
+ /// Returns an expression error
+ MODELAPI_EXPORT virtual std::string expressionError() = 0;
+
+ /// Defines the used parameters
+ MODELAPI_EXPORT virtual void setUsedParameters(const std::set<std::string>& theUsedParameters) = 0;
+
+ /// Returns the used parameters
+ MODELAPI_EXPORT virtual std::set<std::string> usedParameters() const = 0;
+