For the [manipulation capability](https://github.com/ipa-nhg/ros-model-experiments/blob/7be7efd29abd7a09276e43f4ba10da3a39cef156/cob4-25/cob4-25_monitoring/cob4-25_manipualtion.rossystem) rossystem example, the parser fails for `RosParameter`. The parser [expects](https://github.com/ipa320/ros_model_parser/blob/4e4854be4cc60cad2b68f39528b290f911a0efc5/src/ros_model_parser/rossystem_parser.py#L127) the grammar to have `value` keyword.