readcommand	The command tag denotes an action that can be performed by the hardware device.

id                  	Specifies an unique identifier for this element.
implementation      	Specifies the implementation class name.
idref               	Specifies a reference to the element with the matching <a href=&quot;"idAttribute.
AttributeSimpleMeasurementType	Specifies the command data type.

<description>         	Specifies the command description.
<history>             	Specifies the command history.
<optional>            	Defines if this command is optional.
<units>               	Specifies the command data units.
<deprecated>          	Specifies that the contents of this element should be marked as deprecated.
<specreference>       	Specification reference for this command.
<key>                 	Specifies a unique command key.
<configuration>       	Defines this command as a configuration command.
<commandreceived>     	Specifies if a command message can be received from the device.
<rate>                	Specifies the polling rate in milliseconds.
<message>             	Specifies the message to execute  the command.
<method>              	Specifies the method to execute  the command.
<data>                	Specifies the data to execute  the command.
<measurement>         	Specifies the measurement to get the value for the command.
