Description
bool 
yaz_element ( resource id, string elementset )
   This function sets the element set name for retrieval.
  
   Call this function before yaz_search() or
   yaz_present() to specify the element set name for
   records to be retrieved.
  
Note: 
    If this function seems effectless, see the description of the 
    piggybacking option in 
    yaz_connect().