snmpTrapOID having extra ".0"

Hi All,

snmp v2 trap consists of:
     sysUpTime   // {1.3.6.1.2.1.1.3.0}
     snmpTrapOID // {1.3.6.1.6.3.1.1.4.1.0}
     varList     // optional, I can attach anyone variable or more

As snmpTrapOID is 1.3.6.1.6.3.1.1.4.1 but if look at the packet of 
snmptrap snmpTrapOID is 1.3.6.1.6.3.1.1.4.1.0
Can someone have idea of what ".0" signify in snmpTrapOID

Rgds,
sanjay

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