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MARC DISCUSSION PAPER NO. 2019-DP03

DATE: December 12, 2018
REVISED:

NAME: Defining a Field for a Subject Added Entry of Unknown Entity Type in the MARC 21 Bibliographic Format

SOURCE: German National Library, for the Committee on Data Formats

SUMMARY: This paper explores options on how a subject added entry can be accommodated in the MARC 21 Bibliographic Format when the type of entity is unknown. The existing field 653 (Index Term – Uncontrolled) is analyzed, and a new field with one of the field numbers "620", "652" or "670" is discussed.

KEYWORDS: Subject Added Entry of Unkown Entity Type (BD); Field 653 (BD); Index Term – Uncontrolled (BD)

RELATED: 2007-DP01/sec 2.11; 2007-06/8

STATUS/COMMENTS:
12/12/18 – Made available to the MARC community for discussion.

01/27/19 – Results of MARC Advisory Committee discussion: MAC expressed understanding of the need described in the paper. An added entry described by the paper is not "uncontrolled", but its type of entity is "unspecified". There was broad agreement with developing a new field. The tag should be chosen outside the existing 600-655 MARC sequence. New fields in the 1XX and 7XX blocks may be considered, as well as equivalent fields in the MARC Authority format. In addition to the subfields mentioned in the paper, subfields $e, $g, $3, $4, $6, and $8 should be taken into account. The paper will return as a proposal.


Discussion Paper No. 2019-DP03: Defining a Field for a Subject Added Entry of Unknown Entity Type

1. BACKGROUND

In the Bavarian Library Network, the Gnomon Thesaurus is used for providing subject access in bibliographic records. Other smaller thesauri will be used in the future for similar purposes, e.g. the "Index Didacticorum". More information about the Gnomon Thesaurus is available at http://www.englisch.gnomon-online.de . Manuals containing a list of the thesaurus can be downloaded at https://www.philhist.uni-augsburg.de/lehrstuehle/geschichte/alte/projekte/GBD/Gnomon_Download/.

The Gnomon Thesaurus has unique identifiers for each of its entries, e.g. "TH000005178" is the identifier for "Christian Literature" / "Christliche Literatur". URIs identifying single entries in the Gnomon Thesaurus are not (yet) provided. The Gnomon Thesaurus itself has an ISIL serving as a MARC Organization Code, "DE-2581", which is resolved using the URL http://sigel.staatsbibliothek-berlin.de/nc/suche/?isil=DE-2581.

Using the Gnomon Thesaurus for subject added entries poses a problem: The fields in the 6XX range which show by their field number which type of entity is given as added entry (600, 610, 611, 630, 647, 648, 650, 651, 662) can not be used, because the thesaurus itself does not provide this piece of information, and it can't be included retroactively either, due to the size of the thesaurus (approximately 13,000 terms). Using field 650 (Subject Added Entry – Topical Term) by default is not an option, because many of the entities in the Gnomon Thesaurus are not topical terms, but persons, etc.

2. DISCUSSION

In looking for a way to designate that an entity from the Gnomon Thesaurus is the subject of a given bibliographic resource, field 653 (Index Term – Uncontrolled) was analyzed. It is used for an

"index term added entry that is not constructed by standard subject heading/thesaurus-building conventions".

Introduced by the German speaking part of the MARC Community in 2007, its second indicator "Type of term or name" has a list of values from "0" for a "Topical term" to "6" for a "Genre/form term", and a Blank value for "No information provided". However, the field lacks the subfields $0, $1 and $2.

By comparison, field 720 (Added Entry – Uncontrolled Name) is used for an

"added entry in which the name is not controlled in an authority file or list. It is also used for names that have not been formulated according to cataloging rules. Names may be of any type (e.g., personal, corporate, meeting).

Used when one of the other access fields (e.g., 1XX (Headings) or 7XX (Added Entries)) cannot be used because the level of control and/or structure of the name does not meet the requirements of the other access fields. Field 720 should not be used for uncontrolled names intended to provide subject access. In that case, field 653 (Index Term-Uncontrolled) is preferred."

In some respect field 720 is used for an agent whose type of entity is unknown.

Field 720 does not have a second indicator to designate the type of entity, the second indicator is undefined instead. Similar to field 653, field 720 lacks the subfields $0, $1 and $2.

It has to be emphasized that the Gnomon Thesaurus in general is based on standard conventions for building a thesaurus, with the exception that it does not "control" the types of entities, at least not in a machine-usable way. Identifiers to "control" the entries are available, to be used in subfields $0.

3. OPTIONS

Two options seem to be available to solve the issue:

OPTION 1: Add subfields $0, $1 and $2 to the existing field 653

Although the field name contains the term "uncontrolled", linking techniques may be introduced by the definition of subfields $0 (Authority record control number or standard number) and $1 (Real World Object URI). The context of the field is given by defining subfield $2 (Source of heading or term).

OPTION 2: Define a new field in the 6XX range

The new field would be used for a subject added entry, without the usual MARC design of expressing the type of entity by the second and third digit of the field number. Both indicator positions are undefined and contain a blank. The field should have a textual subfield $a for the term, and subfields $0, $1 and $2. In this sense the term provided in the field is controlled, but the field itself is agnostic of the type of entity. As a field name, "Subject Added Entry – Type of Entity Unknown" may be chosen, or "Subject Added Entry – Type of Entity not Coded".

Choosing a field number may result in "620", with reference to field 720. It has to be noted that "620" is not an exact parallel to 720, because there are entities other than agents in scope here, e.g. topical terms.

Alternatively, field number "670" may be chosen. This option would make it clearer that the new field serves as a general solution. From the perspective of the IFLA Library Reference Model (IFLA LRM), the new field covers the relationship "WORK has as subject RES" (LRM-R12), and its inverse relationship "RES is subject of WORK" (LRM-R12i.)

As a third option, field number "652" may be chosen. According to the MARC 21 documentation at http://www.loc.gov/marc/bibliographic/bd6xx.html, field 652 existed some time ago:

"Field 652 - Subject Added Entry-Reversed Geographic [OBSOLETE, 1980]

Field 652 was an agency-defined field used by the Library of Congress for reversed geographic added entries assigned to materials classed in LC classification number span G1000-G9999. For each regular Topic-Place subject heading assigned, a reversed Place--Topic heading was also assigned. Both indicator positions were undefined. The subfield codes were: $a (Geographic name or place element), $x (General subject subdivision), $y (Chronological subject subdivision), $z (Geographic subject subdivision)."

4. EXAMPLES

Bibliographic record, based on http://gateway-bayern.de/BV044212317

A: version with field 653, subfields $0 and $2 added

LDR xxxxxnam a22yyyyy c 4500
001 BV044212317
003 DE-604
020 ## $a9780198726487$chardback$9978-0-19-872648-7
035 ## $a(OCoLC)957764786
040 ## $aDE-604$bger$erda
100 1# $aPollmann, Karla$d1963-$eVerfasser$0(DE-588)128794860$4aut
245 10 $a-The- baptized muse$bearly Christian poetry as cultural authority
$cKarla Pollmann
264 #1#$aOxford$bOxford University Press$c2017
300 ## $avii, 269 Seiten
336 ## $aText$btxt$2rdacontent
337 ## $aohne Hilfsmittel zu benutzen$bn$2rdamedia
338 ## $aBand$bnc$2rdacarrier
650 07 $aKultursoziologie$0(DE-588)4133431-0$2gnd
650 07 $aFrühchristentum$0(DE-588)4129954-1$2gnd
650 07 $aChristliche Lyrik$0(DE-588)4010111-3$2gnd
650 07 $aKulturelle Identität$0(DE-588)4033542-2$2gnd
653 ## $aChristliche Literatur$0(DE-2581)TH000005178$2[Source code for Gnomon Thesaurus]
653 ## $aKulturgeschichte der Antike$0(DE-2581)TH000005829$2[Source code for Gnomon Thesaurus]
653 ## $aIdentität$0(DE-2581)TH000006066$2[Source code for Gnomon Thesaurus]
856 41 $uhttps://www.doabooks.org/doab?func=fulltext&uiLanguage=en&rid=26224
$xVerlag$zkostenfrei$3Volltext

B: version with new field 620

LDR xxxxxnam a22yyyyy c 4500
001 BV044212317
003 DE-604
020 ## $a9780198726487$chardback$9978-0-19-872648-7
035 ## $a(OCoLC)957764786
040 ## $aDE-604$bger$erda
100 1# $aPollmann, Karla$d1963-$eVerfasser$0(DE-588)128794860$4aut
245 10 $a-The- baptized muse$bearly Christian poetry as cultural authority
$cKarla Pollmann
264 #1 $aOxford$bOxford University Press$c2017
300 ## $avii, 269 Seiten
336 ## $aText$btxt$2rdacontent
337 ## $aohne Hilfsmittel zu benutzen$bn$2rdamedia
338 ## $aBand$bnc$2rdacarrier
620 ## $aChristliche Literatur$0(DE-2581)TH000005178$2[Source code for Gnomon Thesaurus]
620 ## $aKulturgeschichte der Antike$0(DE-2581)TH000005829$2[Source code for Gnomon Thesaurus]
620 ## $aIdentität$0(DE-2581)TH000006066$2[Source code for Gnomon Thesaurus]
650 07 $aKultursoziologie$0(DE-588)4133431-0$2gnd
650 07 $aFrühchristentum$0(DE-588)4129954-1$2gnd
650 07 $aChristliche Lyrik$0(DE-588)4010111-3$2gnd
650 07 $aKulturelle Identität$0(DE-588)4033542-2$2gnd
856 41 $uhttps://www.doabooks.org/doab?func=fulltext&uiLanguage=en&rid=26224
$xVerlag$zkostenfrei$3Volltext

C: version with new field 652

LDR xxxxxnam a22yyyyy c 4500
001 BV044212317
003 DE-604
020 ## $a9780198726487$chardback$9978-0-19-872648-7
035 ## $a(OCoLC)957764786
040 ## $aDE-604$bger$erda
100 1# $aPollmann, Karla$d1963-$eVerfasser$0(DE-588)128794860$4aut
245 10 $a-The- baptized muse$bearly Christian poetry as cultural authority
$cKarla Pollmann
264 #1 $aOxford$bOxford University Press$c2017
300 ## $avii, 269 Seiten
336 ## $aText$btxt$2rdacontent
337 ## $aohne Hilfsmittel zu benutzen$bn$2rdamedia
338 ## $aBand$bnc$2rdacarrier
650 07 $aKultursoziologie$0(DE-588)4133431-0$2gnd
650 07 $aFrühchristentum$0(DE-588)4129954-1$2gnd
650 07 $aChristliche Lyrik$0(DE-588)4010111-3$2gnd
650 07 $aKulturelle Identität$0(DE-588)4033542-2$2gnd
652 ## $aChristliche Literatur$0(DE-2581)TH000005178$2[Source code for Gnomon Thesaurus]
652 ## $aKulturgeschichte der Antike$0(DE-2581)TH000005829$2[Source code for Gnomon Thesaurus]
652 ## $aIdentität$0(DE-2581)TH000006066$2[Source code for Gnomon Thesaurus]
856 41 $uhttps://www.doabooks.org/doab?func=fulltext&uiLanguage=en&rid=26224
$xVerlag$zkostenfrei$3Volltext

D: version with new field 670

LDR xxxxxnam a22yyyyy c 4500
001 BV044212317
003 DE-604
020 ## $a9780198726487$chardback$9978-0-19-872648-7
035 ## $a(OCoLC)957764786
040 ## $aDE-604$bger$erda
100 1# $aPollmann, Karla$d1963-$eVerfasser$0(DE-588)128794860$4aut
245 10 $a-The- baptized muse$bearly Christian poetry as cultural authority
$cKarla Pollmann
264 #1 $aOxford$bOxford University Press$c2017
300 ## $avii, 269 Seiten
336 ## $aText$btxt$2rdacontent
337 ## $aohne Hilfsmittel zu benutzen$bn$2rdamedia
338 ## $aBand$bnc$2rdacarrier
650 07 $aKultursoziologie$0(DE-588)4133431-0$2gnd
650 07 $aFrühchristentum$0(DE-588)4129954-1$2gnd
650 07 $aChristliche Lyrik$0(DE-588)4010111-3$2gnd
650 07 $aKulturelle Identität$0(DE-588)4033542-2$2gnd
670 ## $aChristliche Literatur$0(DE-2581)TH000005178$2[Source code for Gnomon Thesaurus]
670 ## $aKulturgeschichte der Antike$0(DE-2581)TH000005829$2[Source code for Gnomon Thesaurus]
670 ## $aIdentität$0(DE-2581)TH000006066$2[Source code for Gnomon Thesaurus]
856 41 $uhttps://www.doabooks.org/doab?func=fulltext&uiLanguage=en&rid=26224
$xVerlag$zkostenfrei$3Volltext

5. BIBFRAME DISCUSSION

BIBFRAME accommodates type-less and multiple types of subjects.

6. QUESTIONS FOR DISCUSSION

6.1. Is the need for introducing a format element sufficiently demonstrated to designate that the type of entity of a subject added entry is unknown?

6.2. If yes: Should the need be accommodated by additions to the existing field 653 (Index Term – Uncontrolled)?

6.3. Or should a new field be defined?

6.4. If yes: Which of the field numbers should be chosen: "620", "652", "670", or a different one? And which one of the possible field names is to be preferred?

6.5. Is there anything else that should be taken into account?


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