Parameters to netsnmp_table_set_add_indexes()

I've noticed that mib2c's generated code makes calls to
netsnmp_table_set_add_indexes() something like this one:

netsnmp_table_set_add_indexes(table_set, 
    ASN_OCTET_STR,  /* index: firstIndexField */
    ASN_INTEGER,    /* index: secondIndexField */ 
    ASN_INTEGER,    /* index: thirdIndexField */
    0); 

What's the final 0 argument for? I've been unable to answer that question for
myself. I've guessed (correctly, I hope) that should I want to add indexes to
a table registration one at a time, rather than all at once, I can call
netsnmp_table_helper_add_index() once per index. But I'm wondering if I need
to add a 0 to the list of index types I pass to
netsnmp_table_helper_add_index(). Thanks in advance for any answers you can
give.

- Josh / eggyknap

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