package std_msgs

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* Protobuf definition of [std_msgs::msgs::Header type in ROS 2.](https://github.com/ros2/common_interfaces/blob/master/std_msgs/msg/Header.msg)

• optional builtin_interfaces.Time stamp = 1

  * Two-integer timestamp that is expressed as seconds and nanoseconds.

• string frame_id = 2

  * Transform frame with which this data is associated.