PROPOSAL NO: 97-2

DATE: December 15, 1996
REVISED:

NAME: Definition of Second Indicator (Display constant controller) in 76X-78X Linking Entry Fields in the USMARC Bibliographic Format

SOURCE: Library of Congress

SUMMARY: This paper proposes the addition of a second indicator in the 76X-78X fields to control the generation of a display constant. Because subfield $i was defined in the linking entry fields recently, there needs to be a mechanism to suppress the tag related display constant to enable the substitution of text in subfield $i.

KEYWORDS: Field 76X-78X (Bibliographic); Linking Entries; Display constant controller

RELATED: 96-4 (Jan. 1996)

STATUS/COMMENTS:

12/15/96 - Forwarded to USMARC Advisory Group for discussion at the 1997 Midwinter MARBI meetings.

2/17/97 - Results of USMARC Advisory Group discussions - Approved.

2/25/97 - Results of final LC review - Approved.


PROPOSAL NO. 97-2: Definition of Second Indicator (Display constant controller)

1. BACKGROUND

Proposal No. 96-4 (Defining a Constituent Unit Entry Field in the
USMARC Bibliographic Format) was approved in January 1996.  It
proposed a field for recording descriptive information about items
that are constituents or elements of the item being cataloged or
contained in the collection, group, or set being cataloged.  Two
options were presented: broadening existing field 770
(Supplement/Special Issue Entry) or adding a new field 774.  In
considering the relationships between field 770, 772, 773 and a
possible new field 774, the paper detailed the need for a second
indicator value to control the display constant in field 772
(Parent Record Entry), since currently only "Supplement to:" is
generated based on the field tag.  The map community has used this
field as a link to the parent for single issues of series.  To
accommodate this need in field 772 and the need for a display
constant controller in the new field 774 (which was the selected
option for constituent unit entries), a second indicator was
defined in both fields.  In addition, subfield $i (Display text),
which was needed in the new field 774, was approved for use in all
76X-78X linking entry fields for text to replace the system
generated constant associated with the other values in the second
indicator.

2. DISCUSSION

In the 76X-78X Linking Entry fields the second indicator is defined
for fields 780 (Preceding Entry) with seven values and 785
(Succeeding Entry) with eight values.  Although the definition of
this indicator is Type of relationship, essentially it is used to
control a display constant associated with the field.  The second
indicator is now defined in fields 772 and 774 as Display constant
controller as follows:
           
   772  Display constant controller
             #    Supplement to
             0    Parent
             8    No display constant generated

   774  Display constant controller
             #    Constituent unit
             0    Includes
             8    No display constant generated

Proposal 96-4 suggested defining value # as "No information
provided" in field 772; this would allow for existing records to be
accommodated and the field related display constant documented in
the format would be used for value #.  However, the MARBI committee
preferred to define # as the actual display constant to be used. 
In the case of field 772, "Supplement to" was associated with the
field tag and value 0 was added for items that are single issues
and use the field to link to the parent.  In the case of field 774
the second indicator values presented in the paper were based on
what would be used if the first option, broadening the use of field
770, were selected.  Thus, value # would be used to generate the
tag related display constant (Supplement to) and value 0 was added
for the constituent unit situation (using "Includes" because it was
more generic than "Constituent unit").  However, when the proposal
was approved to use field 774, the committee did not take a close
look at how those second indicator values would apply to a new
field, where there were no existing records to consider.  The
values # (Constituent unit) and 0 (Includes) are meant to
accommodate the same situation and they need to be combined.   

Since subfield $i was defined across linking entry fields, a
display constant controller is needed to suppress the tag
associated display constant and allow the text in subfield $i to
substitute for it.  A second indicator is needed in the following
fields:
           760                 Main Series Entry
           762                 Subseries Entry 
           765                 Original Language Entry
           767                 Translation Entry
           770                 Supplement/Special Issue Entry
           773                 Host Item Entry
           775                 Other Edition Entry
           776                 Additional Physical Form Entry
           777                 Issued With Entry
           786                 Data Source Entry
           787                 Nonspecific Relationship Entry

In each field value # could be defined as the tag related display
constant documented in the format and value 8 as No display
constant provided.  All fields except 786 and 787 have display
constants associated.  Fields 786 and 787 could define the
indicator with value # meaning "No information provided", or they
could be excluded from the list of fields with the second indicator
defined.

CONSER is interested in using the indicator value to allow for
including display text in subfield $i.  Some possible examples are
as follows:

  787 08 $iCompanion publication to:$tEmpire State report
           (1982)$x0747-8622$w(DLC)   84647292

  787 08 $iGuide to the microfiche collection:$t
           Phonefiche $w (DLC) 88641083

3. PROPOSED CHANGES

The following is presented for consideration:

-       In the USMARC Bibliographic Format define the second
        indicator value in fields 760, 762, 765, 767, 770, 773,
        775, 776, and 777 as follows;
        Second Indicator   Display constant controller
                  #   [Tag related phrase]           
                  8   No display constant generated
        In each field, the display constant associated with the
        field tag will be generated when value # is used.

-       In the USMARC Bibliographic Format define the second
        indicator in fields 786 and 787 as follows:
        Second Indicator   Display constant controller
                  #   No information provided
                  8   No display constant generated

-      In field 774, delete value 0 (Includes) in the second
        indicator.

See Attachment A for a description of this field if this
proposal is approved.

------------------------------------------------------------------
                 ATTACHMENT A
<  > indicates addition; [  ] indicates deletion
76X-78X   Linking Entries--General Information

          760         Main Series Entry  (R)
          762         Subseries Entry  (R)
          765         Original Language Entry  (R)
          767         Translation Entry  (R)
          770         Supplement/Special Issue Entry  (R)
          772         Parent Record Entry  (R)
          773         Host Item Entry  (R)
          774         Constituent Unit Entry  (R)
          775         Other Edition Entry  (R)
          776         Additional Physical Form Entry  (R)
          777         Issued With Entry  (R)
          780         Preceding Entry  (R)
          785         Succeeding Entry  (R)
          786         Data Source Entry  (R)
          787         Nonspecific Relationship Entry  (R)

Indicators

   First            Note controller
      0               Display note
      1               Do not display note

  Second            
   760-770,
   773[,]<->[775]-777
                      <Display constant controller>  [Undefined]
      #                 <Tag related phrase>  [Undefined]
      8                 No display constant generated>
               
 <786-787             Display constant controller
      #                 No information provided
      8                 No display constant generated>

    772               Display constant controller
      #             Supplement to
      0             Parent
      8             No display constant generated
   [774          Display constant controller
                    Constituent unit
      [0         Includes]
      8             No display constant generated]
    780               Type of relationship
      0             Continues
      1             Continues in part
      2             Supersedes
      3             Supersedes in part
      4             Formed by the union of ... and ...
      5             Absorbed
      6             Absorbed in part
      7             Separated from
   785           Type of relationship
      0             Continued by
      1             Continued in part by
      2             Superseded by
      3             Superseded in part by
      4             Absorbed by
      5             Absorbed in part by
      6             Split into ... and ...
      7             Merged with ... to form ...
      8             Changed back to


Go to:


Library of Congress
Library of Congress Help Desk (09/02/98)