The 100 field
for the author in our example bib record also contains a third URI in a
subfield $4.

As stated in
an earlier post, URIs may now be used in subfield $4 to link to records that
provide information about the relationship/relator codes that catalogers have
been using for a while in this subfield.
The URI in
the second subfield $4 of this example:
$4 http://id.loc.gov/vocabulary/relators/aut
links to the
record below from the Library of Congress’ Linked Data Service (https://id.loc.gov/) which describes the relator, “author”
(represented by the code “aut” in the first subfield $4):
author
- A person, family, or organization responsible
for creating a work that is primarily textual in content, regardless of
media type (e.g., printed text, spoken word, electronic text, tactile
text) or genre (e.g., poems, novels, screenplays, blogs). Use also for
persons, etc., creating a new work by paraphrasing, rewriting, or adapting
works by another creator such that the modification has substantially
changed the nature and content of the original or changed the medium of
expression.
- URI(s)
- Codes
- Variants
- Narrower Terms
- SubProperty Of
- Editorial Notes
- History Notes
- Instance Of
- Scheme Membership(s)
- Collection Membership(s)
- Change Notes
- 2021-08-02: new
- 2022-11-29: modified
- Alternate Formats
URIs in
subfield $0 might also point to records describing other types of controlled
terms used in cataloging. For example, the URI for content type from the
Library of Congress’ Linked Data Service (https://id.loc.gov/vocabulary/contentTypes/sti.html) would be entered in the subfield $0
of a 336 field:
336 field
from MARC record:
336 $a text $b txt $2 rdacontent $0 http://id.loc.gov/vocabulary/contentTypes/txt
Record linked
to by URI in the subfield $0 describing the controlled term “text”:
text
- URI(s)
- Codes
- History Notes
- MARC bib: Leader/06: a or t
- Instance Of
- Scheme Membership(s)
- Collection Membership(s)
- Change Notes
- Alternate Formats
In the next and final post of this series, you’ll find a
list of resources that you can use to learn more about linked data and URIs in
MARC records.
This is the sixth in a series of seven weekly blog posts written by Zahra Gordon, the NHSL Cataloger, which will explain “Linked Data,”
an emerging topic in the library field, and how it relates to “Uniform
Resource Identifiers (URIs),” which are appearing in subfields of MARC
records with increasing frequency.