OpenIGTLink/ProtocolV2/Query
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Simple Querying Mechanism in OpenIGTLink Protocol version 2
In OpenIGTLink version 2, special prefixes GET_, STT_, STP_, and RTS_ are used in the message type field in the header for messages to query and control data flow. Those messages with those special prefix should be defined along with primary message types (for example, STT_TDATA, STP_TDATA and RTS_TDATA should be defined with TDATA).
GET_ prefix: Query a single message
"GET_<datatype>" query message is used to request for a single message with type <datatype>. The receiver of "GET_<datatype>" message must return a message with type <datatype> and the same name as the query message. If data is not available, a returned message must be null body (data size = 0).
