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MARC DISCUSSION PAPER NO. 2022-DP01

DATE: December 21, 2021
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 subsets 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); 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; Guidelines for the Use of Field 856, Revised August 1999; Guidelines for the Use of Field 856, Revised March 2003

STATUS/COMMENTS:
12/21/21 – Made available to the MARC community for discussion.

01/27/22 – Results of MARC Advisory Committee discussion: Despite general support for the need to add new field 856 Second Indicator values for component parts of resources and to clarify the uses of subfield $3 that have evolved over time, there were concerns about the conversion of legacy data, backward compatibility, and possible unintended impacts on such other field 856 subfields as $x (Nonpublic Note) and $y (Link Text).  Some questioned the suitability of the term "subset" to describe partial resources, although there was no consensus on better terminology.  It was pointed out that the terms "tangible" and "electronic" are not mutually exclusive because such resources as computer discs are both, so that distinction will have to be expressed differently.  Some preferred that the details of subfield $3 usage might be better relegated to community best practices rather than being built directly into MARC 21. The paper will return as a proposal that will attempt to address many of these issues.


Discussion Paper No. 2022-DP01: Modernization of Field 856 Second Indicator and Subfield $3

1. BACKGROUND

1.1. Introduction

This paper builds on MARC Discussion Paper No. 2020-DP01 and MARC Proposal No. 2020-03, their consideration at the MARC Advisory Committee meetings at the American Library Association Midwinter Meeting in January 2020 and Annual Meetings 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).

The writers working in parallel on this paper and two other papers regarding field 856, including one from the ISSN International Centre in Paris and the Finnish National Library, and another from the German National Library for the Committee on Data Formats, have consulted with each other. In the discussions, they determined both that there were no significant conflicts among the papers and that there was generally mutual support for each. In spite of the perceived compatibility of the papers, it was decided to submit them separately because each had a distinct focus. Submitting them separately also avoided a single, unwieldy, and overly complex paper.

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 and 2020-03.

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 electronic 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 electronic finding aid described in field 555 to its electronic location by specifying that the electronic 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 and the online Annual Meeting in June 2020 when MARC Discussion Paper No. 2020-DP01 and 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 subsets 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 subfield $3 eventually become part of MARC 21, analysis of existing fields 856 will need to be undertaken to determine the accuracy of existing coding, patterns of data in subfield $3, certain characteristics of URIs in subfield $u, and how these elements and others interrelate in actual practice. This could yield useful information about the conditions and instances that might be safely and accurately converted through automated means. Although 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 record in which they appear.

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 existing values "0", "1", and "2". In accord with many reactions to Discussion Paper No. 2020-DP01 and Proposal No. 2020-03, a pair of new values are being proposed.

No changes are suggested for Second Indicator values "blank" and "8".

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

8 - No display constant generated

3.1.1. Second Indicator Values "0" and "3"

Existing value "0" for "Electronic Location of Resource Described" is here paired with new value "3" for "Electronic Location of Subset(s) of Record Described" in the hope that their parallelism will help keep things clear.

Current Definition of Value "0":
Currently, Second Indicator value “0”, "Resource", 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 of Value "0":
We propose limiting the use of value 0 to indicate only that the electronic location in field 856 is for the same resource described by the record as a whole. When the field 856 relates to a subset or subsets of the resource represented by the record, a new Second Indicator value "3" is to be used, along with subfield $3 to specify the subset(s). Value "0" is to be redefined as follows:

0 – Electronic Location of Resource Described
Electronic location in field 856 is for the same online resource described by the record as a whole. In this case, the resource represented by the bibliographic record is the complete electronic resource.
If the electronic location in field 856 is for a subset of the resource represented by the record as a whole, use Second Indicator "3". When appropriate, use subfield $3 to specify the subset(s) to which the field applies.
Display constant 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

Proposed New Value "3":
In parallel to value "0" for the electronic location of the complete resource described by the record as a whole, we suggest a new value "3" for a subset or subsets (using the language of 97-1) of the electronic resource described by the record as a whole:

3 – Electronic Location of Subset(s) of Resource Described
Electronic location in field 856 is for subset of the same online resource described by the record as a whole. In this case, the resource represented by the bibliographic record is the complete electronic resource. The subset(s) are portions of the 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 electronic resource to be a subset, coded Second Indictor value "3". When appropriate, use subfield $3 to specify the subset(s) to which the field applies. Use Second Indicator value "2" for supplementary, additional, or otherwise related electronic resources. When there is uncertainty whether a resource may be a literal subset of the whole or a related resource, use Second Indicator value "2".
Display constant Subset of 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

3.1.2. Second Indicator Values "1" and "4"

Existing value "1" for "Electronic Location of Online Version of Resource Described" is here paired with new value "4" for "Electronic Location of Online Version of Subset(s) of Record Described" in the hope that their parallelism will help keep things clear.

Current Definition of Value "1":
Currently, Second Indicator value "1", "Version of resource", 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 of Value "1":
We propose limiting the use of value "1" to indicate only that the electronic location in field 856 is for an electronic version of the tangible resource described by the record as a whole. When the field 856 relates to an electronic version of a subset or subsets of the tangible resource represented by the record, the new Second Indicator value "4" is to be used, along with subfield $3 to specify the subset(s). Value "1" is to be redefined as follows:

1 – Electronic Location of Online Version of Resource Described
Electronic location in field 856 is for an online version of the tangible resource described by the record as a whole. In this case, field 856 points to an electronic version of the resource represented by the bibliographic record.
If the electronic location in field 856 is for an online version of a subset of the resource represented by the record as a whole, use Second Indicator “4”. When appropriate, use subfield $3 to specify the subset(s) to which the field applies.
Display constant 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

Proposed New Value "4":
In parallel to value "1" for an electronic version of the nonelectronic resource described by the record as a whole, we suggest a new value "4" for an electronic version of a part or parts of the non-electronic resource described by the record as a whole:

4 – Electronic Location of Online Version of Subset(s) of Resource Described
Electronic location in field 856 is for subset(s) of the online version of the tangible resource described by the record as a whole. In this case, field 856 points to an electronic version of the resource represented by the bibliographic record. The subset(s) are portions of the 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 electronic version of the resource to be a subset, coded Second Indicator value "4". When appropriate, use subfield $3 to specify the subset(s) to which the field applies. Use Second Indicator value "2" for supplementary, additional, or otherwise related electronic resources. When there is uncertainty whether a resource may be a literal subset of the whole or a related resource, use Second Indicator value "2".
Display constant Subset of 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

3.1.3. Second Indicator Value "2"

Current Definition of Value "2":
Currently, Second Indicator value "2", "Related resource", is defined as follows:

2 - Related resource
Location in field 856 is for an 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 electronic resource itself. 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.
Display constant Related electronic resource: may be generated.

Proposed Revision of Value "2":
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 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 Electronic Resource
Electronic location in field 856 is for an online resource that has a clear, specific, and direct bibliographic relationship (as opposed to, for instance, a subject relationship) to the bibliographic resource described by the record as a whole but is not a subset of the resource. The resource described by the record as a whole may itself be either tangible or electronic. Examples of related electronic resources include electronic finding aids, errata, bonus materials, or supplementary matter. Corresponding use of subfield $3 is strongly encouraged to further characterize the relationship between the 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 subset of the whole or a related resource, use Second Indicator value "2".
Display constant Related 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)

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 since its initial implementation as a result of MARC Proposal No.94-2. Because of the particular roles field 856 plays in MARC records, and in keeping with the special relationship subfield $3 has to the Second Indicator, considering an update to the definition of subfield $3 in tandem with changes to the Second Indicator seems in order. Many of the suggestions surrounding subfield $3 raised in conjunction with Discussion Paper No. 2020-DP01 and Proposal No. 2020-03 have been incorporated into this paper.

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 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 electronic resource at the location identified in field 856 and the resource described in the record as a whole. Subfield $3 identifies the electronic resource, related electronic resource, subset(s) of the electronic resource, or aspect(s) of the electronic resource to which the URI in the field applies. In cases where the domain name of the URI may not be informative enough, 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 URI 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. QUESTIONS FOR DISCUSSION

5.1. Do the relabeling and revised definitions of existing Second Indicator values "0", "1", and "2" clarify their uses sufficiently?

5.2. Do the labels and definitions of new Second Indicator values "3" and "4" explain their uses and differentiate them from each other sufficiently?

5.3. Have the definitions of new Second Indicator values "3" and "4", intended for subsets of electronic resources, been adequately distinguished from the definition of existing value "2", intended for related resources, including augmentations that are not subsets of the electronic resource?

5.4. In the definition of Second Indicator "2", we have tried to characterize the relationship as follows: "Electronic location in field 856 is for an online resource that has a clear, specific, and direct bibliographic relationship (as opposed to, for instance, a subject relationship) to the bibliographic resource described by the record as a whole but is not a subset of the resource." Does the italicized passage adequately express the intention? If not, how might the intention be better expressed? Might it be helpful to explicitly mention the negative example ("a bibliographic record for a published biography having a field 856 link to the Wikipedia article on that person") directly in the value "2" definition?

5.5. Are the suggested display constants related to the Second Indicator values sufficiently meaningful to users?

5.6. Does the revised definition of subfield $3 sufficiently cover and explain its current uses?

5.7. Are there other potential issues that need to be taken into account?


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