The root node for MTConnect The sender of the message The date and time the document was created A sequence number A debugging flag for testing. The instance number of the agent, used for fault tolerance The size of the agents buffer The time the sample was reported The time a sample occurred A version number A short name for any element A universally unique id that uniquely identifies the element for it's entire life A serial number for a piece of equipment The measurement source A sample rate in milliseconds per sample The id of the component (maps to the id from probe) An identifier The number significant digits The unique id of the asset An asset type The maximum number of assets The number of assets A description An extension point for data item types An extension point for data item statistics types The types of measurements available The types of measurements available The sub-types for a measurement The sub-types for a measurement Statistical operations on data Statistical operations on data An extension point for data item types The units supported The units supported The units supported for the source equipment that can be converted into MTC Units. The units supported for the source equipment that can be converted into MTC Units. The coordinate system to be used for the position Message header for protocol information The root node for MTConnect Protocol dependent information Only for backward compatibility with 1.0 A collection of errors A collection of errors An error result The text description of the error The error code An error description