filename
if xport equals TRUE, a character string giving the full path
to the SAS XPORT file, which must include the file extension. If xport
equals FALSE, either a character string giving the the name of a dataset
in the SAS library or a vector
libname
a character string defining the SAS library, which is usually a
directory reference. If xport equals FALSE and the dataset(s) named in
argument filename do not reside in the working directory, then this
argument is required. The default