...
snmpExampleTable OBJECT-TYPE
    SYNTAX SEQUENCE OF TableEntry
    MAX-ACCESS not-accessible
    STATUS current
    ::= { parentOID 1 }

tableEntry OBJECT-TYPE
    SYNTAX TableEntry
    MAX-ACCESS not-accessible
    STATUS current
    INDEX { tableEntryIndex }
    ::= { snmpExampleTable 1 }

TableEntry ::= SEQUENCE {
    tableEntryIndex    DisplayString,
    tableEntryName   DisplayString,
    tableEntryVal       DisplayString
}

tableEntryIndex OBJECT-TYPE
    SYNTAX DisplayString
    MAX-ACCESS read-only
    STATUS current
    ::= { tableEntry 1 }

...