A method of processing a digital television (DTV) signal in a DTV receiver, receiving a digital television signal including a plurality of extended text table (ETT) instances that appear in transport stream packets with common PID values, the ETT instances having common table ID values, each ETT instance comprising a section header and a message body, the section header containing a table identification (ID) extension field that serves to establish uniqueness of each ETT instance, the message body containing an extended text message (ETM) which provides detailed descriptions of virtual channel or an event associated with each ETT instance, wherein the section header further contains a protocol version field indicating a protocol version, and wherein the ETT instance further contains a CRC 32 field; demodulating the digital television signal; and identifying at least one pertinent ETT instance from the plurality of ETT instances.