ranked list of records, or WAIS Citations.  A WAIS Citation refers to
   a document on the server.  Each WAIS Citation contains the following
   fields:

         1. Headline - a set of words that convey the main idea of the
            document.
         2. Rank - the numerical score of the document based on its
            relevance to the query, normalized to a top score of 1000.
         3. List of available formats - e.g. text, postscript, tiff, etc.
         4. Doc-ID - the location of the document.
         5. Length - the length of the document in bytes.

   The number of WAIS Citations returned was limited by the preferred
   message size negotiated during the Init.

   Retrieval of a document was initiated by the client with a Search
   Request APDU using a Type-1 query.  The query contained up to four
   terms:

         1. Term: Doc-ID
            Use Attribute: system-control-number      code = "un"
            Relation Attribute: equal                 code = "re"




 
RFC 1625                 WAIS over Z39.50-1988                 June 1994


         2. Term: the requested document format
            Use Attribute: data-type                  code = "wt"
            Relation Attribute: equal                 code = "re"
         3. Term: the start location
            Use Attribute: paragraph, line, byte      code = "wp", "wl",
                                                             "wb"
            Relation Attribute: greater-than-or-equal code = "ro"
         4. Term: the end location
            Use Attribute: paragraph, line, byte      code = "wp", "wl",
                                                             "wb"
            Relation Attribute: less-than             code = "rl"

   Because full-text and images were often larger in size than the
   receive buffer of the client, clients were designed to optionally
   retrieve documents in chunks, specifying the start and end positions
   of the chunk in the query.  An example of a fully-specified retrieval
   query is:

   query = ( ( use = "un", relation = "re", term =  )
             AND
             ( use = "wt", relation = "re", term = postscript )
             AND
             ( use = "wb", relation = "ro", term = 0 )
             AND
             ( use = "wb", relation = "ro", term = 2000 )
            )

   A retrieval response was issued by the server with a Search Response
   APDU. In this case a single record corresponding to the requested
   document, or portion thereof, was returned in the specified format.

5.  Security Considerations

   Security issues are not discussed in this memo.

6.  References

   [1] National Information Standards Organization (NISO).  American
       National Standard Z39.50, Information Retrieval Service
       Definition and Protocol Specifications for Library Applications,
       New Brunswick, NJ, Transaction Publishers; 1988.

   [2] ANSI/NISO Z30.50-1992 (version 2) Information Retrieval Service
       and Protocol: American National Standard, Information Retrieval
       Application Service Definition and Protocol Specification for
       Open Systems Interconnection, 1992.






 
RFC 1625                 WAIS over Z39.50-1988                 June 1994


   [3] Z39.50 Version 3: Draft 8", October 1993.  Maintenance Agency
       Reference: Z39.50MA-034.

   [4] Lynch, C., "Using the Z39.50 Information Retrieval Protocol
       in the Internet Environment", Work in Progress, November 1993.

   [5] "Document Identifiers, or International Standard Book Numbers
       for the Electronic Age", Brewster Kahle, Thinking Machines
       Corporation, see URL=<ftp://wais.com/pub/protocol/doc-ids.txt>,
       September 1991.

7.  Authors' Addresses

   Margaret St. Pierre