2. The method of claim 1 , wherein the table ID extension field defines a first value indicating an event identification (ID) to which each ETT corresponds.
1. A method of processing a broadcast signal in a digital television (DTV) receiver, the method comprising: receiving a broadcast signal comprising a plurality of extended text tables (ETTs), wherein each ETT comprises a section header containing a table identification (ID) extension field, wherein each ETT further includes a section body containing an extended text message (ETM) which provides detailed textual description of a virtual channel or an event associated with each ETT, wherein the table ID extension field is set to a value such that separate ETT instances appearing in transport stream packets with common PID values have a unique table ID extension value which serves to establish uniqueness of each ETT, and wherein a PID represents a packet identifier of a transport stream packet in which the ETT instances are conveyed; detecting at least one pertinent ETT from the plurality of ETTs; parsing the detected ETT; and storing an extended text message (ETM) included in the parsed ETT.