RMON implement with net-snmp.

Hi all.

I'm developing a Rmon agent by net-snmp.
I know How RMON is work. I read rfc about RMON.
But, To do so, I've listened that I must implement functin
*_Validate(..) like stat_Validate, history_Validate(..).. from
net-snmp source code. since These are system dependenting functions,
It's up to me how It can work.
However, Important thing is I'm a newbie to RMON.
so I don't know How can I start.

If there are anyone who have been implemented it,
Please, show me a sample source code if you can.
I'm hang on it now :-(
Please Help me.

Thanks everyone who answer me.

best regrads.