VMS Help TCPIP Services, Programming Interfaces, RPC XDR Routines, xdr_vector, Arguments  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 xdrs
    A pointer to an XDR stream handle created by one of the XDR
    stream handle creation routines.
 vecpp
    A pointer to a pointer to the array.
 elnum
    The number of elements in the array.
 elsize
    The size, in bytes, of each element.
 elproc
    The XDR routine to handle each element.