3 xml and 1 FLA

HI people just wondering,

I am about to start a site and in the same FLA I will load 3 differents xml, and have 3 different functions, one for each xml, to parse the data.

Is it a common way to work?

I guess it is better to have one xml with all my data but the structures that I need for each xml are so diferent that I just can not see this happening.