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          TECHNICAL NOTICE (November 2, 2000)

          Changes in MARC Distribution Services
                    LCCN Restructuring
                Newly Defined MARC Characters
                   Changes in MDS Frequency

         Network Development and MARC Standards Office
                       Library of Congress
       ---------------------------------------------------


These are some upcoming changes in the MARC Distribution Services (MDS),
beginning in January 2001.  Three major changes/impact areas are listed
below.  A web-based version of this annoucement can be found at:
www.loc.gov/marc/tn001102.html


 1.  LCCN Restructuring

The Library of Congress has announced previously
(see http://lcweb.loc.gov/marc/lccn.html) a planned restructuring of the
Library of Congress Control Number (LCCN) for newly assigned LCCNs.  As of
January 1, 2001, all newly assigned LCCNs (fields 001 and 010 in records
distributed by CDS) will contain a two-character alphabetic prefix, a
four-digit year portion, and a six-digit serial portion.  The number of
characters in the LCCN will remain the same (12), but the trailing blank
or supplement number will be discontinued.  Previously assigned LCCNs will
not be changed to the new structure, and update records will continue to
be distributed under the old style LCCN.

        Examples:

                Old style         New style
                gm#82012345#      gm2001012345
                ###00456789#      ##2002456789
                n##99005678#      n#2001005678

CDS has created a file of test records containing both the new and old
style LCCNs for use by customers.  The two test files, one containing
bibliographic records and the other containing name authority records, are
available via anonymous FTP at:

        Host: ftp.loc.gov
        Login: anonymous
        Password: <your email address>
        Directory: pub
        Subdirectory: cds/lccn
        Filename: biblccntest (bibliographic test file); authlccntest
                  (authority test file)

 Or download directly from the Web at: ftp://ftp.loc.gov/pub/cds/lccn

        biblccntest (bibliographic test file)
        authlccntest (authority test file)


2.  Newly Defined MARC Characters

CDS has previously announced (see http://www.loc.gov/cds/mds-ils.html ) plans to distribute records
containing the full MARC character set.  This includes the 13 characters
which were authorized as of 1994 but have been filtered or substituted in
distribution by CDS.
See list below:

        Character Name             Hex Value
        spacing circumflex         5E
        spacing underscore         5F
        spacing grave              60
        opening curly bracket      7B
        closing curly bracket      7D
        spacing tilde              7E
        degree sign                C0
        lower case script L        C1
        phono copyright mark       C2
        copyright mark             C3
        sharp                      C4
        inverted question mark     C5
        inverted exclamation mark  C6

On January 1, 2001, CDS will remove the character substitution step and
will distribute records with these characters.   Subscribers can expect to
receive records containing characters and hex values listed above, but
some of the values may not be actively supplied by LC cataloging staff.
For a detailed listing of the LC usage of these characters see the LC
Cataloging Policy and Support Office homepage
(http://lcweb.loc.gov/catdir/cpso/).

CDS has created test files containing records with these new
characters.  The two test files, one containing bibliographic records and
the other containing name authority records, are available via anonymous
FTP at:

        Host:  ftp.loc.gov
        Login:  anonymous
        Password:  <your email address>
        Directory:  pub
        Subdirectory:  cds/lccn
        Filename:  bibchars (bibliographic test file); authchars
                     (authority test file)

Or download directly from the Web at: ftp://ftp.loc.gov/pub/cds/lccn

        bibchars (bibliographic test file)
        authchars (authority test file)


 3. Changes in MDS Frequency

Beginning in January 2001, CDS will increase the frequency of some of its
MARC Distribution Services.   All the quarterly MDS services will be
distributed monthly and the monthly MDS-Serials service will be
distributed weekly.   See the chart below:


      MDS                       Old Frequency           New Frequency
      Books Arabic              quarterly               monthly
      Books Hebrew              quarterly               monthly
      Computer Files            quarterly               monthly
      NUCMC and LC Manuscripts  quarterly               monthly
      Serials [CONSER]          monthly                 weekly


LC Implementation Plans
Subscribers can anticipate receiving MARC records reflecting these changes
in all distribution services not earlier than January, 2001