ng registered. From Fortran this is an optional
argument, or can be one of several types. In the simplest cases, an intrinsic
array containing the data will be sufficient. For these cases, data can
be an assumed size array of type INTEGER(Zoltan_INT), REAL(Zoltan_FLOAT) or REAL(Zoltan_DOUBLE).
When the argument is omitted in the call to the registration function, a
data argument will still be passed to the query function.  This should be
declared as an assumed size array of type INTEGER(Zoltan_INT) and neve