PROPOSAL NO: 96-4

DATE: December 1, 1995
REVISED:

NAME: Defining a Constituent Unit Entry Field in the USMARC Bibliographic Format

SOURCE: Research Libraries Group; Avery Arts and Architecture Library; Athenaeum of Philadelphia

SUMMARY: This paper proposes broadening the use of field 770 (Supplement/Special Issue Entry) to include constituent units of the whole. This field would contain descriptive information about items that are constituents or elements of the item being cataloged or contained in the collection, group, or set being cataloged. The relationships between linking entry fields 770, 772 and 773 is explored. The paper proposes the addition of a second indicator in fields 770 and 772 to control display constants. An alternative is given to define a new field 774 for Constituent Unit Entry and remove the restriction in field 773 (Host Item Entry) that it be used only for titles that are subunits or component parts, i.e., physically contained in the host.

KEYWORDS: Field 770; Field 772; Field 773; Field 774; Supplement/Special Issue Entry; Parent Record Entry; Host Item Entry; Constituent Item Entry; Component parts

RELATED: DP89 (June 1995); DP80 (Feb. 1995)

STATUS/COMMENTS:

12/1/95 - Forwarded to the USMARC Advisory Group for discussion at the January 1996 MARBI meetings.

1/20/96 - Results of USMARC Advisory Group discussion - Approved with the following amendments:

  1. Field 774 is defined as Constituent Unit Entry.
  2. The restriction in field 773 that it may only be included in a record for a component part or subunit will be removed.
  3. The meaning of value blank (#) for the new second indicator to be defined in field 772 will be "Supplement to:", rather than "No information provided.
  4. The link code in subfield $8 is code "c" (Constituent item); only one link code is needed.
2/15/96 - Results of final LC review - Agreed with the MARBI decisions.


PROPOSAL NO. 96-4: Defining a Constituent Unit Entry Field

1.        BACKGROUND

In 1987, the Research Libraries Group added to RLIN a local field,
789, to contain information about items that are constituents or
elements of the item being cataloged, or that are contained in the
collection, group, or set being cataloged.  Although this field has
been used primarily in the cataloging of graphic materials in the
RLIN Visual Materials file (VIM), it appears to be applicable to
any circumstance where highlighting of individual contents of the
described materials is desired, and, secondarily, in circumstances
where a link to ancillary file materials is desirable.  Further
discussion of the use of field 789 in the Avery Architectural and
Fine Arts Library at Columbia University's AVIADOR project and The
Athenaeum of Philadelphia Architectural Archives's PACSCL Graphics
Cataloging Project is given in Discussion Paper No. 89
(<URL:gopher://marvel.loc.gov:70/00/.listarch/usmarc/dp89.doc>).  

In the situations for which field 789 has been used (the link down
to constituent units), separate records are not created for the
constituent units being described for several reasons.  It is
easier to display the information if the descriptive information
about the parts is in the same record; there are cases where
separate records would not be practical, such as incipits for
music, which may be linked to but do not represent separate
bibliographic entities; and, it may not be desirable to fully
catalog separately special issues of serials.

Discussion Paper No. 80 (Defining a Component Item Entry Field in
the USMARC Bibliographic Format), discussed in February 1995, first
brought up this issue.  It reviewed the cataloging options
currently available for description of component items, but some
participants favored the definition of a component item field
because of particular situations where separate analytic records
are not desirable, or when a 505 field does not give the
information needed.  The USMARC Advisory Group recommended that a
second discussion paper be written.  Discussion Paper No. 89
(Defining Field 774 as a Component Iten Entry Field in the USMARC
Bibliographic Format) was considered by the USMARC Advisory Group
in June 1995.  It was requested that the paper come back as a
proposal to define a new field 774 as follows: 

          - reconsider the definition of component part in Leader/07 and
          in the Linking Entry Fields to take out the restriction of
          being "physically" part of another item 

          - use subfields defined across linking entry fields with the
          addition of a second indicator for Display constant controller
          and a new subfield for Other identifier

          - allow for two techniques for linking to the electronic item:
          use of subfield $8 (Link and sequence number) to link between
          774 and 856, or use of subfield $3 with the item identifier
          that is also contained in 774 $i

          - do not provide a specific sequencing technique, since if $8
          is used to link to 856 it can also sequence them. If the other
          method is used, $8 is still available, since it has been
          defined across fields in the bibliographic format.


2.        RELATIONSHIPS BETWEEN LINKING ENTRY FIELDS 770, 772 and 773

The USMARC Bibliographic Format has two linking entry fields
available for a vertical relationship up from an item to its parent
or host item.  Field 772 (Parent Record Entry) is defined to
contain information concerning the related parent record when the
item is a single issue, supplement, or special issue of the parent
item.  Field 773 (Host Item Entry) is defined to contain
information concerning the host item for the component part or
subunit described in the record. Its purpose is to enable the user
to locate the physical piece that contains the part being
described.  It is restricted to situations where the item is coded
as a component part (monographic or serial) or subunit in the
Leader/07 (Bibliographic level).  Thus, the distinction between
fields 772 and 773 is whether the item described is physically
independent.

The definition of a component part in the Leader/07 and in the
Linking entry fields is as follows (definitions for monographic and
serial component parts have been combined here:

          [Monographic or Serial] Component Part.  Code [a or b]
          indicates a [monographic or serial] bibliographic unit that is
          physically attached to or contained in another [monographic or
          serial] unit such that the retrieval of the component part is
          dependent on the physical identification and location of the
          host item or container.  Examples of monographic component
          parts with corresponding host items include an article in a
          single issue of a periodical, a chapter in a book, a band on
          a phonodisc, and a map on a single sheet that contains several
          maps.  The bibliographic record for a component part contains
          fields that describe the component part and data that identify
          the Host Item Entry (field 773).  An example of a serial
          component part with corresponding host item is a regularly
          appearing column or feature in a periodical.

A subunit is defined in the Leader/07 as "a part of collection,
especially an archival unit described collectively elsewhere is the
system ... may be items, folders, boxes, archival series, subgroups
or subcollections".  

When a bibliographic item has a vertical relationship to a parent
item and it is physically independent, field 772 is appropriate for
the link up.  However, the display constant associated with this
field is "Supplement to:", and it has been used for supplements to
serials or technical reports.  Currently, the map community has a
need for this field when there is a parent/child relationship
between items and the child is not physically a part of the parent. 
In particular, the University of California at Santa Barbara is
creating records for digital maps as part of a Digital Library
Project grant funded by the National Science Foundation.  In these
cases, field 772 is needed to contain information that is different
than the parent record and to provide a link to that record. 
Digital files are physically separate and do not require the
retrieval of the parent record for its physical identification, so
it is not appropriate to code them as component parts in Leader/07.

In the case of RLIN's field 789, the request is for a new field
that would link down (the opposite situation of field 772).  As
with the maps project, the items are physically separate and not
dependent upon the parent record for their physical identification. 
The field that has been used as a compliment to field 772 in
serials cataloging is field 770 (Supplement/Special Issue Entry). 
Because this field has such a specific name and the display
constant associated with it is "Has supplement", its possible use
as a general link down in situations such has RLIN has identified
has been overlooked.  If the distinction between field 772 and
field 773 (being independent of or physically a part of the whole)
is necessary, then field 770 seems appropriate for the link down in
these situations if its definition were broadened and an indicator
for display constant controller added. The indicator would be
needed in both field 770 (value blank (#) could be retained to
generate "Has supplement"; a value could be added to generate
"Includes:") and field 772 (value blank (#) retained to generate
"Supplement to"; a value added to generate "Parent:").

The question arises whether a downward linking field complimentary
to field 773 is needed as well, to bring out the distinction
between the constituent units being physically a part of the whole
or being physically independent.  However, no need has been
expressed for the link down when the constituent item is physically
dependent upon the host.  Other techniques can be used to make the
distinction, such as use of field 505.

It is important to consider whether the relationship expressed in
the 770/772 pair is the same relationship as in the RLIN 789 field. 
The following questions need to be examined:

          -  Can a supplement/special issue be considered a constituent
          unit of the serial, i.e. the same type of relationship as the
          constituent unit described in the RLIN 789 field?  Or is the
          770/772 relationship something different and one that we want
          to identify by using a different field?  

          -  If the relationship is different, then a new field is
          needed as the link to the constituent unit.  Such a new field
          would be paired with field 773, which is the link up.  If the
          773 restriction of being physically dependent upon the host is
          removed, then what would be the distinction between fields 773
          and 772? How might this be clarified?

Format integration allowed for linking entry fields with specific
serial uses to be defined across types of material.  Some of the
relationships expressed in these fields may be applicable to other
types of material.  Since the 770/772 relationship appears to be
the same (a vertical link) as that needed for the RLIN 789 field,
this proposal suggests broadening the use of those fields.


3.  NEW DATA ELEMENTS NEEDED IN CONSTITUENT UNIT ENTRY FIELD

Discussion Paper No. 89 mapped the subfields being used in RLIN's
two projects in field 789 to currently available linking entry
subfields.  The only data elements not accommodated are: second
indicator for display constant controller and a subfield for item,
creator, or accession number.

Second indicator.  In the RLIN projects, a second indicator is used
to control the display constant generated.  It is defined as
follows in RLIN's field 789:

          Display constant controller
          #        No information provided
          8        No display constant generated

The display constant used in RLIN is "Component item" and is
associated with the tag.  It was defined so that users would have
the option of suppressing it.  In field 770, the second indicator
could be defined so that blank is used to generate "Has
supplement:", which has been used in the field for supplements or
special issues for serials, and value 0 defined for "Includes:" for
constituent units.  The second indicator could not be defined as a
display constant controller across all linking entry fields, since
it is used for Type of relationship (which results in the
generation of a display constant based on the value) in fields 780
and 785.  It is also needed in field 772 to provide a display
constant such as "Parent:".  

Additional display constants could be added as values when needed
or subfield $i could be defined for display text for other text
associated with the field.  RLIN uses "Component item:" for a
display constant, but, because of the specific definition in USMARC
of component item as something physically a part of another, an
alternative display constant is suggested. 

Subfield for other identifiers.  Field 770 would use the subfields
defined for the Linking Entry fields, 76X-78X.  In addition, a
subfield is needed for "Other identifier", which would include an
item or accession number (subfield $o is proposed).  The component
item number used in the RLIN applications is any number chosen by
the cataloging agency, and it is indexed in the RLIN Component item
number (CIN) index.  This subfield contains numbers associated with
the constituent unit other than standard identifiers that already
have specific subfields defined, for example accession numbers or
creator's numbers.  The subfield might be applicable to other
linking entry fields when it is desirable to include other standard
or non-standard identifiers that do not have specific subfields. 
In the future, it might be considered for a Uniform Resource
Number, a standard being developed by the Internet Engineering Task
Force, with the wrapper "URN:" to indicate what it is.  However,
the URN has not stabilized to the point that it is desirable to
find a place for it yet in the MARC format. 


4.        LINKING THE CONSTITUENT UNIT DESCRIPTION TO THE ELECTRONIC ITEM

          The AVIADOR project uses the 789 field to provide a link to
images on an analog videodisc.  The link is implemented by the RLIN
LaserLink software, which uses the accession number (contained in
its subfield $i) to locate on an internal index the
machine-readable address of the corresponding videodisc image. 
Thus, the online record contains no information about the actual
address of the image on the videodisc.  In some cases it may be
desirable to include a field 856 in the record if the location is
an Internet resource, often using a URL in subfield $u.  In this
case it would be necessary to provide a link between the
descriptive information and field 856 to associate the specific
item with its location.

A record like one of the AVIADOR records might have several
electronic locations:
          -- the electronic address in the AVIADOR videodisc
          -- the digital file name in the DIAP project (where there is
          overlap between the two projects)
          -- the address on a PhotoCD
          -- the URL on the Columbia University network where the image
          is accessible online
Thus, a combination of approaches might be needed.

Technique 1:  Subfield $3 in 856 field.  Subfield $3 (Materials
specified) could be used in field 856 to specify the portion of the
record to which the field applies.  Data that provides a unique
identification of the item could be used in the subfield, such as
an accession number that matches that recorded in 770 $i, and
electronic location information could be recorded in other
appropriate 856 subfields. 

Technique 2:  Subfield $8 link to 856 field.  The 856 field could
be linked to a constituent unit entry field using the subfield $8
linking technique that was approved in June 1994 as part of MARBI
Proposal No. 94-15.  In this case, a link code would need to be
defined.  The 856 field would contain the electronic location and
access information (either a URL or other data).  It would be
linked to the appropriate 770 field using a subfield $8, which
would match the $8 in the 770 field.  A new code "e" could indicate
that the data is provided to link the field to another field in the
record (i.e., field 856) for electronic access.  

See Attachment C for an example of how each technique could be
used.
See Attachment D for the World Wide Web page showing access to the
images used in the example. (For electronic access use:
<URL:http://www.cc.columbia.edu/imaging/html/browsers/camilo/NYDA
93-F100.html>)
 
Sequencing 770 fields.  When $8 is used for linking, it also serves
to sequence the 770 fields.  If $8 is not needed for linking with
an 856 field, it could also be used to indicate the sequence of
occurrences of field 770 for display. This kind of sequence number
aids the user in discriminating between occurrences of field 770
with brief information and gives clues about where the user is if
the display of the record takes more than one screen.  It has been
used in the 789 implementation (in subfield $l).  The number could
take the form <link number>.<sequence number>\s, where "s" would be
defined as a code for "sequence".  Alternatively, it could simply
use the link number portion of the subfield, i.e., <link number>\s.


Participants in the discussion of Discussion Paper No. 89 wanted
both of the linking techniques to be available to satisfy different
needs.


5.        FIELD 505 VERSUS 770

Field 770 is being used in a manner similar to a contents note with
more content designation, and it is also being used to link to a
digital item, although the link is through field 856.  Both fields
505 and 770 describe constituents of the item.  Field 770 would be
available if it is necessary to provide more detailed information
than that provided in 505 and parsed into separate subfields for
each element.  It is likely that there will also be cases where a
link is desired to another bibliographic record (for the
constituent unit) when one exists through the subfield $w.  In
addition, it may also be desirable to use the linking entry field
for indexing of additional elements, e.g., ISSN, ISBN, uniform
title.


6.        IMPLICATIONS FOR RECORD LENGTH

The use of a linking entry field for constituent unit has
implications for exceeding limits for record length.  If separate
770 fields are created for each constituent unit with descriptive
information recorded in its separate subfields, and each field is
linked to a corresponding 856 field with electronic location
information, the record could potentially become very large.  RLIN
has had to use two or three records by which arbitrarily breaking
up the information about the constituent units, and they have so
far not had a problem.  Institutions will need to consider these
constraints when determining whether or how to use this approach. 


&.        PROPOSED CHANGES

          The following is presented for consideration:

          -        Change the name of field 770 (Supplement/Special Issue
                   Entry) to Supplement/Special Issue/Constituent Unit Entry
                   in the USMARC Bibliographic Format.  

          Alternatively, define field 774 as Constituent Unit Entry,
          remove the restriction in field 773 that the record must be
          coded as a component part or subunit, and clarify the
          relationship between fields 772 and 773 with that restriction
          removed.  If this option were followed, the other proposed
          changes below are also needed (except the second indicator
          defined for 770 would instead be defined in field 774).

          -        Define a second indicator for field 770 as Display
                   Constant Controller.
                            #         No information provided 
                            0         Includes:
                            8         No display constant generated
                   Value # is used to generate the text previously
                   associated with the tag ("Has supplement")

          -        Define a second indicator for field 772 as Display
                   Constant Controller.
                            #         No information provided
                            0         Parent
                            8         No display constant generated
                   Value # is used to generate the text previously
                   associated with the tag ("Supplement to:")                                                             
                                                                                                                          
          
          -        Define subfield $o (Other item identifier) in the
                   76X-78X Linking Entry Fields.

          -        Define subfield $i (Display text) in the 76X-78X Linking
                   entry Fields

          -        Define the following link codes for subfield $8                                                        
                            code e - electronic access
                            code s - sequence 
          See Attachment A for a description of the 76X-78X Linking
          entry fields if this proposal is approved.                                                   
          See Attachment B for a description of field 770 if this
          proposal is approved.

------------------------------------------------------------------
                                                       ATTACHMENT A

76X-78X   Linking EntriesūGeneral Information
Note:  [ ] indicates deletion; < > indicates addition
         760        Main Series Entry
         762        Subseries Entry
         765        Original Language Entry
         767        Translation Entry
         770        Supplement/Special Issue/<Constituent Unit> Entry
         772        Parent Record Entry
         773        Host Item Entry
         775        Other Edition Entry
         776        Additional Physical Form Entry
         777        Issued With Entry
         780        Preceding Entry
         785        Succeeding Entry
         786        Data Source Entry
         787        Nonspecific Relationship Entry

Indicators

   First            Note controller
     0            Display note
     1            Do not display note

  Second
   760-777,
   786-787  Undefined
     #            Undefined

   <770      Display constant controller
     #            No information provided
     0            Includes
     8            No display constant generated
   772          Display constant controller
     #            No information provided
     0            Parent:
     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

Subfield Codes
                    Control subfields
     $3      Materials specified  (NR)   [773 only]
     $6      Linkage  (NR)
     $7      Control subfield  (NR)
                  /0 - Type of main entry heading
                  /1 - Form of name
                  /2 - Type of record
                  /3 - Bibliographic level

                    Descriptive information
     $a      Main entry heading  (NR)
     $b      Edition  (NR)
     $c      Qualifying information  (NR)
                   [all except 773]
     $d      Place, publisher, and date of
                  publication  (NR)
     $g      Relationship information  (R)
     $h      Physical description  (NR)
     <$i   Display text  (NR) [770/772 only]>
     $j      Period of content  (NR)  [786 only]
     $k      Series data for related item  (R)
                  [all except 760 and 762]
     $m    Material-specific details  (NR)
     $n      Note  (R)
     $p      Abbreviated title  (NR)   [773 only]
     $s      Uniform title  (NR)
     $t      Title  (NR)
                Numbers/codes
     $e      Language code  (NR)   [775 only]
     $f      Country code  (NR)   [775 only]
     <$o   Other identifier (R)>
     $r      Report number  (R)
     [all except 760, 762, and 777]
     $u      Standard Technical Report Number  (NR)
     [all except 760, 762, and 777]
     $v      Source contribution  (NR)  [786 only]
     $w      Record control number  (R)
     $x      International Standard Serial Number  (NR)
     $y      CODEN Designation  (NR)
     $z      International Standard Book Number  (R)
     [all except 760, 762, and 777]


DEFINITION AND SCOPE

         The linking entry fields contain data concerning related
items.  These fields specify the relationship between the related
bibliographic items.  These relationships fall into two classes: 
1) those related items that may assist the user in continuing to
search but are not necessarily required in order to obtain the
target item, e.g., former entries for serials, translations of the
target item; 2) those related items that are required to obtain the
target item (e.g., the host item for a component part).  The
linking entry fields are designed to display a note in the record
in which the linking entry field appears and to provide machine
linkage between the record for the target item and the record for
the related item, if one exists.

Definitions of terms used in descriptions of the linking entry
fields are:

         Target Item.  A bibliographic item that is the principal or
         primary unit for the description of which the record was
         constructed.  The target item is the item to which the data in
         character positions 06 (Type of record) and 07 (Bibliographic
         level) of the Leader apply.

         Related Item.  A bibliographic item that has either a
         chronological, horizontal, or vertical relationship with a
         target item, and for which the linking entry field is
         formulated.

         Component Part.  A bibliographic item that is physically part
         of another bibliographic item such that the retrieval of the
         part is dependent on the physical identification and location
         of the host item (e.g., a chapter in a book, an article in a
         journal).

         <Constituent Unit.  A bibliographic item that is a part of
         another item.  The constituent unit may be physically separate
         from the parent item.>  

         Host Item.  A bibliographic item that physically contains the
         component part described by the target item record (e.g., the
         book containing the described chapter, the journal in which
         the article appears).

         Chronological Relationship.  The relationship in time between
         bibliographic items (e.g., the relation of a serial to its
         predecessors and successors).

         Horizontal Relationship.  The relationship between versions of
         a bibliographic item in different languages, format, media,
         etc.

         Vertical Relationship.  The hierarchical relationship of the
         whole to its parts and the parts to the whole (e.g., a journal
         article to the journal, subseries to main entry series).


Record Links and Notes

         The record-linking technique in USMARC is described below.

   Linking Entry Fields (fields 760-787)ūThese fields carry
           descriptive data concerning the related item, the control
           number for the record of the related item, or both.  Minimal
           content designation is provided for the data concerning the
           related item that is used in the linking entry fields.  For
           data operations requiring fuller content designation such as
           indexing and sorting, subfield w (control number for the
           related item) allows the system to follow that link to the
           related record to obtain fully content-designated data. 
           Moreover, the coded data in control subfield 7 allows some
           types of indexing without reference to the actual related
           record.

   Linking Entry Complexity Note (field 580)ūThe Linking Entry Fields
           are designed to support generation of a note concerning the
           related item in a display of the record for the target item. 
           When the relationship is too complex to be expressed using a
           display constant and the data from the linking entry field or
           the linked record, the note is recorded in the Linking Entry
           Complexity Note field.  When used, this field appears in
           addition to any relevant linking entry field.  The value used
           in the first indicator position of the linking entry fields
           determines whether a note is to be generated from the linking
           entry field or from field 580.

   Linked-Record Requirement (Leader/19)ūThis data element indicates
           whether sufficient information is present in the linking
           entry field to support generation of an eye-legible note that
           identifies the related item or whether only a related record
           number is recorded.  If only a record number appears, the
           system will need to obtain the appropriate information from
           the related record to construct a standard display.

         The following subfields or subfield combinations are
         considered sufficient for display purposes:

     Subfield a + t                     Main entry heading + Title
     Subfield a + s                     Main entry heading + Uniform title
     Subfield t                         Title
     Subfield u                         Standard Technical Report Number
     Subfield r                         Report Number

------------------------------------------------------------------
                                                       ATTACHMENT B

770   Supplement/Special Issue/<Constituent Unit> Entry  (R)

Indicators

   First          Note controller
     0            Display note
     1            Do not display note

   Second         [Undefined] <Display constant controller>
     #            Undefined
     <0         Includes
     8            No display constant generated>

Subfield Codes
     $a      Main entry heading  (NR)
     $b      Edition  (NR)
     $c      Qualifying information  (NR)
     $d      Place, publisher, and date
                   of publication  (NR)
     $g      Relationship information  (R)
     $h      Physical description of source  (NR)
     <$i     Display text  (NR)>                          
     $k      Series data for related item  (R)
     $m      Material-specific details  (NR)
     $n      Note  (R)
     <$o     Other identifier  (R)>
     $r      Report number  (R)
     $s      Uniform title  (NR)
     $t      Title  (NR)
     $u      Standard Technical Report Number  (NR)
     $w      Record control number  (R)
     $x      International Standard Serial Number  (NR)
     $y      CODEN designation  (NR)
     $z      International Standard Book Number  (R)
     $6      Linkage  (NR)
     $7      Control subfield  (NR)
             /0 - Type of main entry heading
             /1 - Form of name
             /2 - Type of record
             /3 - Bibliographic level


FIELD DEFINITION AND SCOPE

         This field contains information concerning supplements, [or]
special issues, <or constituent units> associated with the target
item but cataloged and/or input as separate records <or described
separately in this field> (vertical relationship).

         When a note is generated from this field, it is displayed
and/or printed with an introductory phrase that is generated as a
display constant based on the [field tag] <value in the second
indicator>.



GUIDELINES FOR APPLYING CONTENT DESIGNATORS

         A description of the first and second indicator positions and
all subfield codes, as well as input conventions except for display
constants, for field 770 are given in the 76X-78X Linking
EntriesūGeneral Information section.


 EXAMPLES


         245      00$aNews of the Cooperative Health Statistics System.
         770      0#$tDirectory: United States, territories, and
                  Canada$w(DLC)$$$78646712$w(OCoLC)4579783
                  [Record is for the parent title; link gives entry of a
                  supplement.]

         245      00$aJournal of cellular biochemistry.
         767      0#$tJournal of cellular biochemistry.  Supplement$x0733-
                  1959
                  [Record is for the parent title; link gives entry of a
                  supplement.]



INPUT CONVENTIONS

Display Constant

<Introductory terms or phrases such as Has supplement:  that are
displayed in notes with the data recorded in field 770 are not
carried in the USMARC record.  They may be system generated as
display constants associated with the second indicator value.>

         [Has supplement:]

[The introductory phrase Has supplement: that is displayed in notes
with the data recorded in field 770 is not carried in the USMARC
record.  It may be system generated as a display constant
associated with the field tag.]



RELATED USMARC FIELD OR DOCUMENT

         76X-78X                    Linking EntriesūGeneral Information
------------------------------------------------------------------
                                                       ATTACHMENT C

Example 1. DIAP record.

Option 1 (Use of $3):
Note that subfield $8 in 770 is used to sequence the fields (code
"s), since it is not used in this option to link to field 856. 
Two URL's are provided in each 856 field for two different file
formats of the same item (DIAP image and PhotoCD image).

ID:NYDA93-F100    RTYP:c    ST:s   FRN:   MS:   EL:  AD:09-16-93
CC:9114  BLT:gc   DCF:a   CSC:d   MOD:?   SNR:  ATC: UD:10-18-93
CPR:xx     L:     INT:?   TEQ:?  TYPE:s
PC:i      PD:1989/1993       RUN:???         GPC:?    ACMP:?????
043          n-us-ny
100 1        Vergara, Camilo J.
245 10       [136th Street, southeastern section of the
             Bronx]$h[graphic].
260          [between 1989 and 1993].
300          11 slides :$bKodachrome 64 daytime ;$c35 mm.
500          Slides taken by Camilo Vergara in the company of Lenny
             Hicks.
500          Forms part of the New American Ghetto Collection.
500          Bracketed information supplied by cataloger.
650  7       Expressway.$2aat
650  7       Garden suburbs.$2aat
650  7       Apartment houses.$2aat
650  7       Buildings.$2aat
650  7       Streets.$2aat
650  7       Street maps.$2aat
651  0       Mott Haven (New York, N.Y.)$xPictorial works.
700 1        Hicks, Lenny.
770 00       $81\s$oNYDA.1993.010.00130.$n[DIAPimage].$tMap of area
             with highlighted street
770 00       $82\s$oNYDA.1993.010.00131.$n[DIAPimage].$tView of Mill
             Brook Houses from one of the houses,$d89/05 
770 00       $83\s$oNYDA.1993.010.00132.$n[DIAPimage].$tView SE from
             Mill Brook Houses on rooftop on Cypress Ave. between
             136st. St. and 137th St.,$d93/05 
770 00       $84\s$oNYDA.1993.010.00133.$n[DIAPimage].$tView N from
             136th St. roof top of area between Bruckner Expressway
             and Cypress Ave.,$d93/06 
770 00       $85\s$oNYDA.1993.010.00134.$n[DIAPimage].$tView E from
             rooftop of garden bounded by Bruckner Expressway,136st
             St. and 135th St.,$d93/06 
856 7        $3NYDA.1993.010.00130
             $uhttp://www.cc.columbia.edu/imaging/photocd/3009-1031-
             1443/IMG0089.512.gif
             $uhttp://www.cc.columbia.edu/imaging/diap/jfif00/
             .mosaic/nyc00217.jpg $2http
856 7        $3NYDA.1993.010.00131
             $uhttp://www.cc.columbia.edu/imaging/photocd/3009-1031-
             1443/IMP0090.512.gif
             $uhttp://www.cc.columbia.edu/imaging/diap/jfif00/
             .mosaic/nyc00345.jpg $2http
856 7        $3NYDA.1993.010.00132$uhttp://www.cc.columbia.edu/imaging
             /photocd/3009-1031-1443/IMP0091.512.gif
             $uhttp://www.cc.columbia.edu/imaging/diap/jfif00/
             .mosaic/nyc00346.jpg $2http
856 7        $3NYDA.1993.010.00133$uhttp://www.cc.columbia.edu/imaging
             /photocd/3009-1031-1443/IMP0092.512.gif
             $uhttp://www.cc.columbia.edu/imaging/diap/jfif00/
             .mosaic/nyc00347.jpg $2http
856 7        $3NYDA.1993.010.00134$uhttp://www.cc.columbia.edu/imaging
             /photocd/3009-1031-1443/IMP0094.512.gif
             $uhttp://www.cc.columbia.edu/imaging/diap/jfif00/
             .mosaic/nyc00349.jpg $2http

Option 2: Use of 856 with $8
Note that in subfield $8, code "e" denotes "electronic link" in
the field link type.  Subfield $8 in field 856 links both to the
appropriate 770 field and sequences the 856 fields.

ID:NYDA93-F100   RTYP:c   ST:s   FRN:   MS:   EL:     AD:09-16-93
CC:9114  BLT:gc   DCF:a   CSC:d   MOD:?   SNR:  ATC:  UD:10-18-93
CPR:xx     L:        INT:?   TEQ:?  TYPE:s
PC:i      PD:1989/1993       RUN:???         GPC:?    ACMP:?????
043          n-us-ny
100 1        Vergara, Camilo J.
245 10       [136th Street, southeastern section of the
             Bronx]$h[graphic].
260          [between 1989 and 1993].
300          11 slides :$bKodachrome 64 daytime ;$c35 mm.
500          Slides taken by Camilo Vergara in the company of Lenny
             Hicks.
500          Forms part of the New American Ghetto Collection.
500          Bracketed information supplied by cataloger.
650  7       Expressway.$2aat
650  7       Garden suburbs.$2aat
650  7       Apartment houses.$2aat
650  7       Buildings.$2aat
650  7       Streets.$2aat
650  7       Street maps.$2aat
651  0       Mott Haven (New York, N.Y.)$xPictorial works.
700 1        Hicks, Lenny.
770 00       $81\e$oNYDA.1993.010.00130.$n[DIAPimage].$tMap of area
             with highlighted street
770 00       $82\e$oNYDA.1993.010.00131.$n[DIAPimage].$tView of Mill
             Brook Houses from one of the houses,$d89/05 
770 00       $83\e$oNYDA.1993.010.00132.$n[DIAPimage].$tView SE from
             Mill Brook Houses on rooftop on Cypress Ave. between
             136st. St. and 137th St.,$d93/05 
770 00       $84\e$oNYDA.1993.010.00133.$n[DIAPimage].$tView N from
             136th St. roof top of area between Bruckner Expressway
             and Cypress Ave.,$d93/06 
770 00       $85\e$oNYDA.1993.010.00134.$n[DIAPimage].$tView E from
             rooftop of garden bounded by Bruckner Expressway,136st
             St. and 135th St.,$d93/06 
856 7        $81.1\e$uhttp://www.cc.columbia.edu/imaging/photocd/3009-
             1031-1443/IMG0089.512.gif $2http
856 7        $81.2\e$uhttp://www.cc.columbia.edu/imaging/diap/jfif00/
             .mosaic/nyc00217.jpg $2http
856 7        $82.1\e$uhttp://www.cc.columbia.edu/imaging/photocd/3009-
             1031-1443/IMP0090.512.gif $2http 
856 7        $82.2\e$uhttp://www.cc.columbia.edu/imaging/diap/jfif00/.
             mosaic/nyc00345.jpg $2http
856 7        $83.1\e$uhttp://www.cc.columbia.edu/imaging/photocd/3009-
             1031-1443/IMP0091.512.gif $2http 
856 7        $83.2\e$uhttp://www.cc.columbia.edu/imaging/diap/jfif00/ 
             .mosaic/nyc00346.jpg $2http
856 7        $84.1\e$uhttp://www.cc.columbia.edu/imaging/photocd/3009-
             1031-1443/IMP0092.512.gif $2http
856 7        $84.2\e$uhttp://www.cc.columbia.edu/imaging/diap/jfif00/
             .mosaic/nyc00347.jpg $2http
856 7        $85.1\e$uhttp://www.cc.columbia.edu/imaging/photocd/3009-
             1031-1443/IMP0094.512.gif $2http
856 7        $85.2\e$uhttp://www.cc.columbia.edu/imaging/diap/jfif00/
             .mosaic/nyc00349.jpg $2http


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