# I.10 Linking relationships

*I.10.1 Applicable rules*

AACR2 12.7B8 covers notes that should be made for linking relationships
for a resource and its immediately preceding, immediately succeeding, or
simultaneously issued resources. In addition, AACR2 21.28 on added
entries for related works should be consulted.

*I.10.2 PCC application policy*

LCRI 21.28B1 specifies that for integrating resources, reciprocal
linking notes will be made between related works. No added entries
should be made unless the related work falls into the categories covered
by rules 21.8-21.27 (i.e., specific types of relationships such as
adaptations, revisions, and translations). Thus for the majority of
linking relationships, notes will be made on the two related resources,
but no related work added entries will be made (i.e., 76X-78X notes are
made, but 700-730 entries are not made).

Links are made between integrating resources and serials, integrating
resources and other integrating resources, and integrating resources and
monographs.

Per LCRI 12.7B8, for all linking notes, works should be cited using the
entry form under which the resource is found in the catalog against
which the searching and cataloging is done. All main entries must be
given in AACR2 form. If the main entry on the related record is not in
AACR2 form, it must be changed to AACR2.

For continuations and splits, PCC practice is not to apply the option
supplying date of the change. However, for absorptions, PCC practice is
to supply the date of absorption when readily available. (See the LCRIs
for 12.7B8a, 12.7B8c and 12.7B8d.)

Most linking note fields in MARC 21 include display constants that are
generated along with the contents of the field, if the first indicator
is set to "0." In most cases, catalogers will want the text of these
notes to display.

*I.10.2.1 Chronological relationships*

Reciprocal notes are made in the new record for the chronological
relationships listed below:

-   Continued by B

-   Continues A

-   Continues in part A

-   Absorbed by B

-   Absorbed A

> The following chronological relationships will generally require that
> the note be made using the 580 field due to the complex nature of the
> relationship:

-   Merged with A to form C

-   Merged with B to form C

-   Merger of A and B

-   Split into: B and C and D

The MARC 21 fields defined for chronological relationships are the 780
field (Preceding entry) and the 785 field (Succeeding entry). By
selecting the first indicator of "0", the text shown above in the first
list may be generated automatically; the cataloger provides the correct
entry for the resource title in subfields \$a and \$t, or subfields \$a
and \$s, or subfield \$t. Other subfields may be used as appropriate. A
580 note is also used when the relationship is complex, such as a merger
or a split. When a 580 note is used, the first indicator of the 78X note
should be "1" to suppress the automatic display note. See the *MARC 21
Format for Bibliographic Data* for a complete discussion of the use of
these fields.

*I.10.2.2 Horizontal relationships*

Integrating resources may have relationships with other resources that
the cataloger will want to note. These would include translations or
resources published simultaneously in several editions.

Reciprocal note fields are available in MARC 21 for these types of
notes. Translations are recorded in 765 (Original language entry) and
767 (Translation entry) notes. Indicators can be coded to automatically
generate the notes: "Translation of" and "Translated as."

Note that the 765 and 767 fields are not used for one Web site that is
presented in two or more languages, at a single URL, where the user has
a choice of language options. In such cases, use the 546 field to
provide information about the language versions (see *I.9.4*) and supply
a 246 field for access to the variant title in another language (see
*I.3*).

The 775 field (other edition entry) is used for works issued in
simultaneous editions. Indicators can be coded to automatically generate
the note "Other edition available," which is used on both related
records.

### I.10.2.3 Other formats

When a work is issued in several formats, such as print and online, or
CD-ROM and online, information regarding the available formats is
recorded in a 776 field (Additional physical form note). When possible,
use MARC field 776 subfield \$i to record a textual explanation of the
additional format. If the 776 subfield \$i is used, do not also make a
note regarding the other formats in the 530 field.

### I.10.2.4 Supplements

If an integrating resource is a supplement to another resource, give the
name of the main resource in a note. For online material, the main Web
site is not generally to be considered a parent entry, and particular
resources within that site are generally not treated as supplements. Do
not assume that hierarchical elements in a given domain represent
supplementary relationships.

If the resource has supplements that are described separately, notes
should be made about the supplement. Per LCRI 21.28B1, added entries
would also be made for the related titles.

The reciprocal MARC fields for supplement notes are 770
(Supplement/special issue entry) and 772 (Supplement parent entry).
Indicators can be coded to automatically generate the notes "Has
supplement:" and "Supplement to:"

*I.10.2.5 Other relationships*

For other linking relationships, or where the type of relationship
cannot be determined, the 787 field (Nonspecific relationship) is used.
In case of doubt about possible relationships between resources, do not
make a note.