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 of character strings giving the names of
datasets in the SAS library, where the dataset names cannot exceed eight
characters in length and do not include the file extension.
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 value is NULL.