making data types

Hello All,

Well, things are starting to make sense and come together slowly as I keep
getting a better feel for using PostgreSQL and the extension interfacing in
"C". 
I am now wondering if someone could please explain to me how to make a new data
type that I can use in my "C" functions and return to the calling PL/pgSQL
function.

for example in "C" I might have something like:

typedef struct dataset 
{    char one[20];    char two[30];
} dataset;


then I could easily have:

dataset *work_on_data_set(text *invalue1, int4 invalue2)
{    dataset *somedataset;
.
.
.    return somedataset;
}

My question is how to declare "dataset" so that both the "C" and PL/pgSQL can
see the same structure (type)?

Can anyone please clear this up?

Lonnie



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