VMS Help TCPIP Services, Programming Interfaces, RPC XDR Routines, xdr_array, 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.
 arrp
    A pointer to the pointer to the array.
 sizep
    A pointer to the number of elements in the array. This element
    count cannot exceed the maxsize parameter.
 maxsize
    The maximum size of the sizep parameter. This value is the
    maximum number of elements that the array can hold.
 elsize
    The size, in bytes, of each of the array's elements.
 elproc
    The XDR routine to call that handles each element of the array.