JCOFunction getStructure

hi all,

Iam a newbie to JCO, iam working on a sample program where iam creating a function , from that function am able to get ExportParameterList , through this parameterlist iam able to get the structure.

My Question is to get the structure we need to pass the index as the parameter,

EX: function.getExportParameterList().getStructure("RETURN");

is there any standard list of index available? since the parameter what we are passing looks like hardcoded.

Any help is greatly appreciated,

-bs