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MARC PROPOSAL NO. 2022-07

DATE: May 26, 2022
REVISED:

NAME: Modernization of Field 856 Second Indicator and Subfield $3 in the MARC 21 Formats

SOURCE: OCLC

SUMMARY: This paper continues the modernization of the existing field 856 (Electronic Location and Access) in all MARC formats by clarifying the use of existing Second Indicator (Relationship) values, defining new Second Indicator values for component parts of resources, and updating the definition of subfield $3 (Materials specified).

KEYWORDS: Field 856 (All formats); Electronic location and access (All formats); Field 856, 2nd indicator (All formats); Subfield $3, in field 856 (All formats); Materials specified (All formats); Access to online information resources (All formats); Uniform Resource Identifier (All formats); URIs

RELATED: Proposal 93-4; 97-1; 99-06; 2000-07; 2019-01; 2020-03; DP 49; DP 54; DP 69; 2018-DP11; 2020-DP01; 2022-DP01; Guidelines for the Use of Field 856, Revised August 1999; Guidelines for the Use of Field 856, Revised March 2003

STATUS/COMMENTS:
05/26/22 – Made available to the MARC community for discussion.

06/28/22 – Results of MARC Advisory Committee discussion: Approved, with the following editorial amendments:

10/27/22 – Results of MARC Steering Group review - Agreed with the MAC decision.


Proposal No. 2022-07: Modernization of Field 856 Second Indicator and Subfield $3

1. BACKGROUND

1.1. Introduction

This paper builds on MARC Discussion Papers No. 2020-DP01 and 2022-DP01, MARC Proposal No. 2020-03, their consideration at the MARC Advisory Committee (MAC) Midwinter Meetings in January 2020 and January 2022 and Annual Meeting in June 2020, and reactions stemming from those exchanges. Those papers resulted in making subfields $b, $h, $i, $j, $k, $l, $n, $r, and $t obsolete in field 856 (Electronic Location and Access).

This current paper focuses on field 856 Second Indicator (Relationship), consideration of which was set aside during the June 2020 MAC meetings for future discussion, as well as its relationship to subfield $3 (Materials specified). Discussions of 2022-DP01 at MAC Midwinter 2022 were invaluable in helping to clarify many aspects of this proposal to reflect contemporary usage and support access to online resources in an environment dominated by web resources.

1.2. Historical Background

MARC Proposal No. 2020-03 Section 1.2 provides a detailed account of the history of field 856 going back as far as 1993. As a result of that proposal, subfields $b, $h, $i, $j, $k, $l, $n, $r, and $t became obsolete in field 856 in all formats as part of MARC 21 Update No. 31 (December 2020).

The Library of Congress Network Development and MARC Standards Office "Guidelines for the Use of Field 856, Revised March 2003," cited in the Proposal No. 2020-03 history as well as above in the list of documents related to this paper, has since 2021 June 3 included the notation “(under revision 2021).” As of the time of this writing, there appear to have been no other revisions made. Those promised revisions will presumably adjust the guidelines to account for the now obsolete subfields.

Of particular relevance to this discussion paper is MARC Proposal No. 97-1, "Definition of Second Indicator (Relationship to Source) in Field 856 (Electronic Location and Access) in the USMARC Formats,” which was submitted by CONSER in December 1996. In the “Status/Comments” section of the paper it states that "When updating the format, LC should consider RLG's [Research Library Group] suggestions concerning more meaningful and less ambiguous display constants to be recommended. It was noted, however, that display constants are only suggested and not prescribed." In the "Discussion" section of the paper, it states:

Field 856 has come to be used to link to an electronic resource that may be related in various ways to the item described in the record and may belong to one of the categories above. It may link to the resource described in the record (i.e., an electronic resource); it may link to an online version of the resource when the record describes the original; it may link to a subset of the record; or, it may link to a related resource. In the first two cases, the link may be only to a subset of the resource described.

This paper is in part an attempt to explicitly account for those cases acknowledged in that final sentence. Even a quarter century later, doing so was a major theme of reactions to 2020-DP01, 2020-03, and 2022-DP01.

Subfield $3 was added to field 856 as a result of MARC Proposal No. 94-2, "Addition of Subfields $g and $3 to Field 856 (Electronic Location and Access) in the USMARC Holdings/Bibliographic Formats," a paper that is not readily available in online form on the MARC website. Proposal No. 97-1 states the following: "Proposal No. 94-2 … resulted in the definition of subfield $3 (Materials specified) to specify the part of the item described in the record to which the 856 field applies. At the time it was felt that this usage was particularly suited to linking an online finding aid described in field 555 to its electronic location by specifying that the online object being linked to was the finding aid, rather than the collective item described in the record. Other uses for subfield $3 to specify the material being linked to were also envisioned."

2. DISCUSSION

This paper continues the reexamination of field 856 with an eye towards bringing this vital field into the twenty-first century. It builds on discussions at the MAC meetings at ALA Midwinter in January 2020, the online Annual Meeting in June 2020, and the online Midwinter Meeting in January 2022 when MARC Discussion Papers No. 2020-DP01 and 2022-DP01and MARC Proposal No. 2020-03 were considered.

According to the MARC definition, the Second Indicator is used to specify the "Relationship between the electronic resource at the location identified in field 856 and the item described in the record as a whole." With the growth of online resources and the prospect of linked data, the need for more clarity in the Second Indicator and for new values that account for component parts of online resources has become increasingly evident. The MARC definition for the Second Indicator goes on to state, "Subfield $3 is used to provide further information about the relationship if it is not a one-to-one relationship." It makes sense to consider and clarify the Second Indicator and subfield $3 together.

Because this paper is part of the larger effort to retrofit field 856 for the future, the prospects for updating legacy fields 856 is an obvious question. If some version of these suggested changes to the Second Indicator and clarifications to subfield $3 eventually become part of MARC 21, analysis of existing fields 856 will need to be undertaken. Patterns of data in subfield $3, certain characteristics of URIs in subfield $u, and how these elements and others interrelate will yield useful information about the conditions and instances that can be safely and accurately converted through automated means and will offer guidance in manual decisions. Such common designations as "table of contents" and "summary" (plus their non-English equivalents) in subfield $3 and the known or discoverable patterns in the URIs of many publishers, distributors, aggregators, and other entities can help ensure accurate updating of many fields 856.

Although challenges will certainly remain in the process of such conversions and the records that would need to be changed range far beyond those in WorldCat alone, OCLC is confident that substantial numbers of 856 fields could be updated to more accurately reflect both their own content and the relationship they hold to the resource represented by the bibliographic records in which they appear. OCLC would argue that the coding distinctions between complete online resources and component parts of online resources – a distinction that has been recognized since the earliest discussions of field 856 but have never before been made possible – are useful enough to warrant the lack of backward compatibility the Second Indicator changes will cause. Although this paper does not suggest such language, succinct explanations could be added to MARC field 856 in the Content Designator History. (Explanations of older practices and/or coding that may still be found in records have been included elsewhere throughout MARC 21 Bibliographic, including such fields as 007, 010, 020, 024, 033, 041, 045, 050, 082, 210, 240, 300, 490, 541, 561, 740, 76X-78X.)

In Discussion Paper No. 2022-DP01, we used the terminology of "subset" for the new Second Indicator values "3" and "4". This had been the terminology used in Proposal 97-1, when CONSER initially proposed the Second Indicator for field 856. It is used in the second sentence of the current MARC definition of Field 856: "The field may be used in a bibliographic record for a resource when that resource or a subset of it is available electronically." (Italics added.) And "subset" also seems to be the preferred term in the 856 Guidelines document. The use of "subset" in 2022-DP01 turned out to be one of its most discussed points. Looking more closely at both MARC field 856 and the 856 Guidelines, we find that, in addition to "subset", such terms as "portion," "constituent," "part," and even "aspect" are each used in similar contexts regarding partial resources. In MAC discussions most of these terms and several others were suggested instead of "subset" as being more clear or user-friendly.

While looking into the seeming interchangeability of these terms in MARC, we remembered that the MARC 76X-78X – Linking Entries-General Information page offers the following definitions, among others, obviously in the different context of the linking entry fields:

Component Part - 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). (Field 774)

Constituent Unit - Bibliographic item that is part of another item. The constituent unit is physically separate from the item of which it is considered a part. (Fields 770, 774)

Although many were fine with "subset," there were no fewer than half a dozen alternative recommendations and variants. But perhaps it is prudent to accede to MARC itself in this case and go with "component part." If MAC prefers another choice, we can consider most to be friendly amendments.

3. PROPOSED CHANGES

3.1. Changes to Second Indicator (Relationship)

Field 856 is structured identically in the MARC Bibliographic, Authority, Holdings, Classification, and Community Information formats, although the definition and scope differ slightly from format to format. Note however, that in the MARC Authority format and the MARC Classification format each of the current Second Indicator values is defined, but only value “blank” (No information provided) is used.

The suggestions in this paper do not intend to change the fundamental nature of the Second Indicator. Instead, they are first intended to clarify the definition of the indicator itself, and the existing values "blank", "0", "1", and "2". In accord with many reactions to Discussion Papers No. 2020-DP01 and 2022-DP01 and Proposal No. 2020-03, a pair of new values are being proposed.

Taking into account some reactions to 2022-DP01, we propose slight clarifications to the definition of the Second Indicator and to the definitions of several existing indicator values. To do this, we will employ the terminology introduced with the addition of field 856 subfield $7, approved as part of 2019-01, including the specification of "online" when referring to such electronic resources, where appropriate.

No changes are suggested for Second Indicator value "8 - No display constant generated".

The values for the Second Indicator will be dealt with out of numeric order in the hope that their parallelisms will help keep things clear. Non-numeric value "blank" (No information provided) will be first. Then, existing value "0 ", currently defined for "Resource," will be followed by new value "3" for "Location of Component Part(s) of Record Described." Existing value "1" currently defined for "Version of Resource” will then be followed by new value "4" for " Location of Online Electronic Version of Component Part(s) of Record Described."

3.1.1 Second Indicator Definition

Current Definition
Currently, the Second Indicator is defined as follows:

Second Indicator - Relationship
Relationship between the electronic resource at the location identified in field 856 and the item described in the record as a whole.
Subfield $3 is used to provide further information about the relationship if it is not a one-to-one relationship.

Proposed Revision
We propose clarifying the definition of the Second Indicator to remove the limitation to one-to-one relationships, so as to accommodate the additional uses that have evolved and are being proposed:

Second Indicator - Relationship
Relationship between the online electronic resource at the location identified in field 856 and the resource described in the record as a whole.
Subfield $3 is used to provide further information about the relationship, when appropriate.

3.1.2. Second Indicator Value "Blank"

Current Definition
Currently, Second Indicator value "Blank", is defined as follows:

# - No information provided
No information is provided about the relationship of the electronic resource to the bibliographic item described by the record.

Proposed Revision
We propose clarifying the definition of value “blank” to indicate explicitly that the electronic location in field 856 is for the resource described by the record as a whole:

# - No information provided
No information is provided about the relationship of the online electronic resource identified in field 856 to the bibliographic resource described by the record as a whole.

3.1.3. Second Indicator Value "0"

Current Definition:
Currently, Second Indicator value "0" is defined as follows:

0 - Resource
Electronic location in field 856 is for the same resource described by the record as a whole. In this case, the item represented by the bibliographic record is an electronic resource. If the data in field 856 relates to a constituent unit of the resource represented by the record, subfield $3 is used to specify the portion(s) to which the field applies. Display constant Electronic resource: may be generated.

Proposed Revision:
We propose limiting the use of value 0 to indicate only that the online electronic location in field 856 is for the resource described by the record as a whole. When the field 856 relates to one or more component parts of the resource represented by the record, a new Second Indicator value "3" is to be used, along with subfield $3 to specify the component parts(s). Value "0" is to be redefined as follows:

0 - Location of Resource Described
Online electronic location in field 856 is for the complete online electronic resource described by the record as a whole.
If the online electronic location in field 856 is for one or more component parts of the resource represented by the record as a whole, use Second Indicator "3".
Display constant Online electronic resource: may be generated.

Examples

245 10  Hepatitis C viruses : $b the story of a scientific and therapeutic revolution / $c edited by Arash Grakoui, Jean-Michel Pawlotsky, and Glenn Randall.
300  ## 1 online resource (ix, 469 pages, 6 pages of plates) : $b illustrations
856 40  $u https://www.ncbi.nlm.nih.gov/books/NBK1613 $7 0

245 10  Roswell / $c Federal Bureau of Investigation.
300  ## 1 online resource (1 unnumbered page) : $b digital, PDF file
856 40  $u http://purl.access.gpo.gov/GPO/LPS98141 $7 0

245 00  Circulation and control : $b artistic culture and intellectual property in the nineteenth century / $c edited by Marie-Stéphanie Delamaire and Will Slauter.
300  ## 1 online resource xiv (524 pages) ; $b illustrations
856 40  $u https://www.openbookpublishers.com/10.11647/obp.0247.pdf $7 0

3.1.4. Second Indicator Value "3"

Proposed New Value "3"
In parallel to value "0" for the online electronic location of the complete resource described by the record as a whole, we suggest a new value "3" for one or more component parts of the online electronic resource described by the record as a whole:

3 - Location of Component Part(s) of Resource Described
Online electronic location in field 856 is for one or more component parts of the complete online electronic resource described by the record as a whole. The component parts are portions of the online electronic resource, such as a table of contents or a sample chapter. Consider each of multiple fields 856 that add up to a complete representation of the online electronic resource to be a component part, coded Second Indictor value "3". When appropriate, use subfield $3 to specify the component part(s) to which the field applies. Use Second Indicator value "2" for supplementary, additional, or otherwise related online electronic resources. When there is uncertainty whether a resource may be a literal component part of the whole or a related resource, use Second Indicator value "2".
Display constant Component part of online electronic resource: may be generated.

Examples

245 10 Explosion and fire at the Macondo well (11 fatalities, 17 seriously injured, and serious environmental damage) : $b Deepwater Horizon rig, Mississippi Canyon Block #252, Gulf of Mexico, April 20, 2010 / $c US Chemical Safety and Hazard Investigation Board.
300 ## 1 online resource (2 volumes) : $b color illustrations.
856 43 $3 Volume 1 $u http://www.csb.gov/assets/1/7/Vol_1_Final.pdf $7 0
856 43 $3 Volume 2 $u http://www.csb.gov/assets/1/7/Vol_2_Final_Version.pdf $7 0

110 1   United States. $b Animal and Plant Health Inspection Service. $b Biotechnology and Regulatory Services, $e author.
245 10  Dow AgroSciences petitions (09-233-01p, 09-349-01p, and 11-234-01p) for determinations of nonregulated status for 2,4-D-resistant corn and soybean varieties : $b draft environmental impact statement.
300 ##  1 online resource (2 volumes) : $b color illustrations
856 43  $3 Appendices $u http://files.library.northwestern.edu/transportation/online/unrestricted/EIS/2014/20140001/2,4-D_Resistant_GE_Corn_and_Soybean_EIS_Appendix_1-8.pdf $7 0

110 2   Yosemite National Park (Agency : U.S.), $e author.
245 10  Restoration of the Mariposa Grove of giant sequoias : $b final environmental impact statement.
300 ##  1 online resource (various pagings) : $b color illustrations, color maps
856 43  $3 Front cover, executive summary, and TOC $u http://files.library.northwestern.edu/transportation/online/unrestricted/EIS/2013/20130316/Final_EIS_Front_Matter_Exec_Sum_10_2013.pdf $7 0

3.1.5. Second Indicator Value "1"

Current Definition
Currently, Second Indicator value "1" is defined as follows:

1 - Version of resource
Location in field 856 is for an electronic version of the resource described by the record. In this case, the item represented by the bibliographic record is not electronic but an electronic version is available. If the data in field 856 relates to a constituent unit of the resource represented by the record, subfield $3 is used to specify the portion(s) to which the field applies. Display constant Electronic version: may be generated.

Proposed Revision
We propose limiting the use of value "1" to indicate only that the electronic location in field 856 is for an online electronic version of the resource described by the record as a whole. When the field 856 relates to an online electronic version of one or more component parts of the resource represented by the record, the new Second Indicator value "4" is to be used, along with subfield $3 to specify the component part(s). Value "1" is to be redefined as follows:

1 - Location of Online Electronic Version of Resource Described
Online electronic location in field 856 is for an online electronic version of the resource described by the record as a whole. In this case, the bibliographic record itself does not represent an online electronic resource but an online electronic version is available.
If the online electronic location in field 856 is for an online electronic version of a component part of the resource represented by the record as a whole, use Second Indicator “4”. When appropriate, use subfield $3 to specify the component part(s) to which the field applies.
Display constant Online electronic version: may be generated.

Examples

245 14 The security situation in the Syrian Arab Republic : $b implications for U.S. national security and U.S. policy options : Committee on Armed Services, House of Representatives, One Hundred Thirteenth Congress, first session, hearing held July 17, 2013.
300 ##  iii, 95 pages : $b portraits ; $c 24 cm
856 41 $3 PDF version: $u http://purl.fdlp.gov/GPO/gpo40739 $7 0

100 1  Garofano, John.
245 14 The intervention debate : $b towards a posture of principled judgment /$ǂc John Garofano.
300 ##  v, 89 pages ; $c 23 cm
856 41 $u http://purl.access.gpo.gov/GPO/LPS19517 $7 0

245 00  Herbert Hoover National Historic Site, Iowa : $b Junior Ranger activity book.
300 ##  14 pages : $b illustrations (chiefly color) ; $c 28 cm
856 41  $u https://purl.fdlp.gov/GPO/gpo105955 $7 0

3.1.6. Second Indicator Value "4"

Proposed New Value "4":
In parallel to value "1" for an online electronic version of the resource that is described by the record as a whole but is not itself an online electronic resource, we suggest a new value "4" for online electronic versions of one or more component parts of the resource described by the record as a whole:

4 - Location of Online Electronic Version of Component Part(s) of Resource Described
Online electronic location in field 856 is for one or more component parts of the online electronic version of the resource described by the record as a whole. In this case, the bibliographic record itself does not represent an online electronic resource but online electronic versions of one or more component parts are available, such as a table of contents or a sample chapter. Consider each of multiple fields 856 that add up to a complete representation of the online electronic version of the resource to be a component part, coded Second Indicator value "4". When appropriate, use subfield $3 to specify the component part(s) to which the field applies. Use Second Indicator value "2" for supplementary, additional, or otherwise related online electronic resources. When there is uncertainty whether a resource may be a literal component part of the whole or a related resource, use Second Indicator value "2".
Display constant Component part of online electronic version: may be generated.

Examples

245 10 Lettere e biglietti / $c Goliarda Sapienza ; a cura di Angelo Pellegrino.
300 ##  421 pages ; $c 22 cm
856 44  $3 Table of contents only $u https://www.loc.gov/catdir/toc/cassalini18/4738323.pdf $7 0

245 10 Atlas of the city of Philadelphia (Central) : $b South Street to Lehigh Ave., wards 5 to 20, 28, 29, 31, 32, 37 & 47, from actual surveys and official plans / $c by George W. and Walter S. Bromley.
300 ##  28 [i.e. 59] leaves : $b 28 color maps ; $c 59 cm
856 44 $3 Title page $u http://www.philageohistory.org/rdic-images/view-image.cfm/BRM1922.CentralPhila.001.TitlePage $z Greater Philadelphia GeoHistory Network $7 0

245 00  Open Marxism / $c edited by Werner Bonefeld, Richard Gunn, and Kosmas Psychopedis.
300  ##  3 volumes ; $c 23 cm
856 44  $3 Vol. 1 $u http://libcom.org/library/open-marxism-volume-1-dialectics-history $z Vol. 1 is also available online $7 0
856 44  $3 Vol. 2 $u http://libcom.org/library/open-marxism-volume-2-theory-practice $z Vol. 2 is also available online $7 0
856 44  $3 Vol. 3 $u http://libcom.org/library/open-marxism-volume-3-emancipating-marx $z Vol. 3 is also available online $7 0

3.1.7. Second Indicator Value "2"

Current Definition
Currently, Second Indicator value "2" is defined as follows:

2 - Related resource
Location in field 856 is for an online electronic resource that is related to the bibliographic item described by the record. In this case, the item represented by the bibliographic record is not the online electronic resource itself. Subfield $3 can be used to further characterize the relationship between the online electronic item identified in field 856 and the item represented by the bibliographic record as a whole.
Display constant Related electronic resource: may be generated.

Proposed Revision
Historically, some catalogers have applied an overly broad interpretation of the term "Related Resource" that has resulted in, for instance, a bibliographic record for a published biography having a field 856 link to the Wikipedia article on that person. Although that is not strictly incorrect by the current definition of Second Indicator value "2", it seems to be beyond the true intention of the code. We propose narrowing the use of value "2" to online electronic resources that have a specific bibliographic relationship to the resource described in the body of the record, rather than, for instance, a mere general subject relationship to the resource. Value "2" is to be defined as follows:

2 - Related Online Electronic Resource
Online electronic location in field 856 is for an online electronic resource that has a clear, specific, and direct bibliographic relationship to the bibliographic resource described by the record as a whole but is not a component part of the resource. Do not use field 856 with Second Indicator value "2" for resources that have only a subject relationship to the resource described. As an example, it would not be proper for a bibliographic record describing a published biography to have a field 856 link to the Wikipedia article on that person. Examples of related online electronic resources include electronic finding aids, errata, bonus materials, supplementary matter, more complete credits or awards for a film, or lyrics for a musical recording. Corresponding use of subfield $3 is strongly encouraged to further characterize the relationship between the online electronic resource identified in field 856 and the resource represented by the bibliographic record as a whole. When there is uncertainty whether a resource may be a literal component part of the whole or a related resource, use Second Indicator value "2".
Display constant Related online electronic resource: may be generated.

Examples

245 00  $k Papers, $f 1932-1970 $g (bulk 1932-1965)
856 42  $3 Finding aid $u //www.loc.gov/ammem/ead/jackson.sgm $7 0

100 1    Avila, Jennie, $e composer, $e lyricist, $e performer.
245 10  Civil War stories in song / $c by Jennie Avila.
500 ##  Source stories, reference photos, and lyrics available online.
856 42 $3 Source stories, reference photos, lyrics $u http://www.jennieavila.com/ $7 0

100 1   Crawford, Davell. $4 prf
245 10 My gift to you / $c Davell Crawford.
300 ##  1 audio disc : $b digital ; $c 4 3/4 in.
856 42 $3 bonus tracks $u http://www.BasinStreetRecords.com/Davell-Bonus-Tracks $7 1

3.2. Changes to Subfield $3 (Materials Specified)

Subfield $3 is defined in more than eighty MARC Bibliographic fields but has only occasionally needed more explanation than its use to differentiate multiple statements of "materials specified." In the case of field 856 and the often complex relationship between subfield $3 and the Second Indicator, however, additional details and guidance seem in order. Since its initial implementation as a result of MARC Proposal No. 94-2, field 856 has attained a central role in the MARC format and how it fits into the wider universe of data. As documented in Sections 3.2.1 and 3.2.2 following, subfield $3 and its uses are referenced throughout the MARC field 856 and the LC "Guidelines for the Use of Field 856." As we suggest clarifications to and expansions of Second Indicator values, it makes sense to try to consolidate and codify the uses of subfield $3 in field 856 and its interactions with the Second Indicator. The suggestions in this paper do not intend to change the fundamental nature of the subfield $3. Instead, they are intended to modernize subfield $3 in various ways that have been documented and found to be useful. Many of the suggestions surrounding subfield $3 raised in conjunction with Discussion Papers No. 2020-DP01 and 2022-DP01 and Proposal No. 2020-03 have been incorporated into this paper.

Just as the essence of subfield $3 is not changing, neither are the traditional uses of subfields $x (Nonpublic Note), $y (Link Text), or $z (Public Note). (It must be noted that the "Guidelines for the Use of Field 856, Revised March 2003" documents some historical overlap in the uses of these subfields.) Subfield $x will continue to be used for notes not intended for public display, including processing information about the file at the location specified. Subfield $y will continue to be used for the text intended for display in place of the address in subfield $u. Subfield $z will continue to be used for any additional notes that are suitable for public display, including subscription information, access restrictions, and electronic addresses for resources that are no longer available (as suggested by RDA LC-PCC Policy Statement 4.6.1.4). Exactly how field 856 subfields $3, $x, $y, and $z display and interact has traditionally been determined by local systems, applications, and editing.

3.2.1. Current Definition of Subfield $3
In field 856, subfield $3 is currently defined as follows:

$3 - Materials specified (NR)
Part of the described material to which the field applies.

In the context of the Second Indicator (Relationship) definition, subfield $3 is referred to as follows: "Subfield $3 is used to provide further information about the relationship if it is not a one-to-one relationship." In the definitions of both values "0" and "1", it states: "If the data in field 856 relates to a constituent unit of the resource represented by the record, subfield $3 is used to specify the portion(s) to which the field applies." In the definition of value "2", it says: “Subfield $3 can be used to further characterize the relationship between the electronic item identified in field 856 and the item represented by the bibliographic record as a whole."

Within the context of the "Input Conventions" for "Embedded Holdings Information," subfield $3 is referred to as follows: "Subfield $3 may be used to specify the parts of an item to which information in field 856 applies."

3.2.2. Current Related Guidelines for Subfield $3
The "Guidelines for the Use of Field 856, Revised March 2003" document contains several references to subfield $3:

Uniform Resource Identifier. For any access method, a Uniform Resource Identifier (URI) is generally recorded in subfield $u. Separate subfields may be used if it is desirable to display data in a particular way.
The most commonly used data elements in field 856 are as follows:

...

Multiple 856 fields. There are many reasons to include multiple 856 fields in records. The following are the most common:

...

Subfield $3 (Materials specified). Subfield $3 is used to specify to what portion or aspect of the resource the electronic location and access information applies. Specific situations may be:

The guidelines also note that until the June 2000 approval of Proposal No. 2000-7, the point at which subfield $y was defined for "Link text," "Some systems have used subfields $3 or $z in the past for this purpose."

The Provider-Neutral E-Resource MARC Record Guide: P-N/RDA version, September 3, 2019 revision allows an additional use for field 856 subfield $3: "… If the domain name is not specific enough, $3 may be used to record package/provider name."

3.2.3. Proposed Revision to Definition of Subfield $3
We propose that the definition of subfield $3 be revised and modernized, as follows, to explicitly encompass the roles it has usefully played since the mid-1990s and that have already been documented in such contexts as the 856 guidelines and in Provider-Neutral practices:

$3 - Materials specified (NR)
Use subfield $3 to provide appropriate additional information about the relationship, which is coded in the Second Indicator, between the online electronic resource at the location identified in field 856 and the resource described in the record as a whole. Subfield $3 identifies the online electronic resource, related online electronic resource, component part(s) of the online electronic resource, or aspect(s) of the online electronic resource to which the URL in the field applies. Subfield $3 may be used to identify the provider, packager, distributor, etc. Use subfield $y (Link text) for the display text to be used in place of the URL in subfield $u.

Examples

100 1#  Offenbach, Jacques, $d 1819-1880.
245 13 Le mariage aux lanternes; $b operette en un acte. / $c Paroles de Michel Carré et Leon Battu. Partition piano et chant. [Réduits au piano au H. Salomon].
300  ## 1 vocal score (72 pages) $c 28 cm
856 41 $3 Internet Archive, UNC Chapel Hill copy $u https://archive.org/details/lemariageauxlant00offe $7 0

110 2#  Robert Sayer and John Bennett (Firm), $e corporate author.
245 14 The American military pocket atlas : $b being an approved collection of correct maps, both general and particular, of the British colonies, especially those which now are, or probably may be the theatre of war : taken principally from the actual surveys and judicious observations of engineers De Brahm and Römans, Cook, Jackson, and Collet, Maj. Holland, and other officers, employed in His Majesty's fleets and armies.
300 ## viii pages, 6 folded color maps ;$c 24 cm
856 44 $3 View a selection of digital images in the Beinecke Library's Digital Images Online database $u http://beinecke.library.yale.edu/dl_crosscollex/callnumSRCHXC.asp?WC=N&SS=N&CN=Cb23_27 $7 0
[Link provides access to only five of the six maps and none of the preliminary textual matter]

245 12  A catalogue of polyphonic songs, 1415-1480 / $c David Fallows.
300  ##  xi, 777 pages : $b music ; $c 24 cm
856 42  $3 Author's list of corrections, adjustments, and additions $u http://personalpages.manchester.ac.uk/staff/david.fallows/appendix.pdf $7 0

4. BIBFRAME DISCUSSION

The implications of these proposed changes on BIBFRAME will need to be considered together in order to prevent inadvertent data loss and conversion inconsistencies.

5. SUMMARY OF PROPOSED CHANGES

In field 856 (Electronic Location and Access) of the MARC Bibliographic, Authority, Holdings, Classification, and Community Information Formats:

5.1. Revise the definition of Second Indicator (Relationship), as outlined in Section 3.1.1.

5.2. Revise the definition of Second Indicator value "Blank" (No Information Provided), as outlined in Section 3.1.2.

5.3. Change the name of Second Indicator value "0" to " Location of Resource Described," revise its definition, and revise its display constant to "Online electronic resource," as outlined in Section 3.1.3.

5.4. Change the name of Second Indicator value "1" to "Location of Online Electronic Version of Resource Described," revise its definition, and revise its display constant to "Online electronic version," as outlined in Section 3.1.5.

5.5. Change the name of Second Indicator value "2" to "Related Online Electronic Resource," revise its definition, and revise its display constant to "Related online electronic resource," as outlined in Section 3.1.7.

5.6. Define new Second Indicator value "3" as " Location of Component Part(s) of Resource Described" and suggest new display constant "Component part of online electronic resource," as outlined in Section 3.1.4.

5.7. Define new Second Indicator value "4" as "Location of Online Electronic Version of Component Part(s) of Resource Described" and suggest new display constant "Component part of online electronic version," as outlined in Section 3.1.6.

5.8. Revise the definition of subfield $3 (Materials Specified), as outlined in Section 3.2.3.


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