The Purpose of Keris Panjang

[eli]

From my knowledge the therory of combating rapiers has been but to rest do to the short tang on a keris which would make it easy to break during a fight. And many have also commented on the overall lack of efficency it would have compared to a rapier. Finally, if we look at where we see keris Panjang( often with royality or high ranking offcials) it just doesnt add up for me.