BibFormats

856  Electronic Location and Access (R)

Record Type

BIB, LHR

Input Standards

Field (Full/Minimal)
Optional/Optional
1st Indicator  Access method
blank character No information provided
0 Email
1 FTP
2 Remote login (Telnet)
3 Dial-up
4 HTTP
7 Method specified in subfield ǂ2
2nd Indicator  Relationship
blank character No information provided
0 Resource
1 Version of resource
2 Related resource
3 Component part(s) of resource
4 Version of component part(s) of resource
8 No display constant generated
Subfields (R=Repeatable  NR=Nonrepeatable) Input Standards (Full/Minimal)
ǂa Host name (R) Optional/Optional
ǂc Compression information (R) Optional/Optional
ǂd Path (R) Optional/Optional
ǂe Data provenance (R) Optional/Optional
ǂf Electronic name (R) Optional/Optional
ǂg Persistent identifier (R) Optional/Optional
ǂh Non-functioning Uniform Resource Identifier (R) Optional/Optional
ǂi Instruction (R) Obsolete/Obsolete
ǂl Standardized information governing access (R) Optional/Optional
ǂm Contact for access assistance (R) Optional/Optional
ǂn Terms governing access (R) Optional/Optional
ǂo Operating system (NR) Optional/Optional
ǂp Port (NR) Optional/Optional
ǂq Electronic format type (R) Optional/Optional
ǂr Standardized information governing use and reproduction (R) Optional/Optional
ǂs File size (R) Optional/Optional
ǂt Terms governing use and reproduction (R) Optional/Optional
ǂu Uniform Resource Identifier (R) Required if applicable/Required if applicable
ǂv Hours access method available (R) Optional/Optional
ǂw Record control number (R) Optional/Optional
ǂx Nonpublic note (R) Optional/Optional
ǂy Link text (R) Optional/Optional
ǂz Public note (R) Optional/Optional
ǂ2 Access method (NR) Optional/Optional
ǂ3 Materials specified (NR) Required if applicable/Required if applicable
ǂ6 Linkage (NR) System supplied/System supplied
ǂ7 Access status (NR) Optional/Optional
ǂ8 Field link and sequence number (R) Optional/Optional

Definition

The information required to locate and access electronic resources, including online resources. Use field 856 in a bibliographic record for a resource when that resource or a subset of it is available electronically. In addition, use field 856 to locate and access a related electronic resource or an electronic version of a non-electronic resource described in the bibliographic record.

The phrase "networked electronic resource" is used to refer to an electronic resource for which content is accessed using a network protocol such as telnet, http, ftp, etc.

Repeat field 856 when the location data elements vary (the Uniform Resource Identifier (URI) in subfield ǂu or subfields ǂa and ǂd, when used) and when more than one access method is used. Repeat field 856 also when different portions of the item are available electronically, mirror sites are recorded, different formats/resolutions with different URIs are indicated, or related items are recorded.

The data in field 856 may be a URI recorded in subfield ǂu or the necessary locator information may be parsed into separate defined subfields. Note that separate subfields for locator data were provided when this field was first established in 1993, but these are seldom used in current cataloging. An access method, or protocol used, is given as a value in the 1st indicator position (if the access method is email, FTP, remote login (telnet), dial-up, or HTTP) or in subfield ǂ2 (if the access method is anything else). The access method is the first element of a Uniform Resource Locator (URL). The field may also include a Uniform Resource Name (URN), e.g., a Digital Object Identifier (DOI) or handle.

Guidelines

Enter generally-accessible URIs whenever possible. Do not enter an institution-specific URI in field 856 in WorldCat records unless no other URI is available. Instead, it may be possible to omit the institution or proxy server data, leaving only the base URI or the base URI plus item identifier. Sometimes it is possible to otherwise manipulate the URI to result in a useable address.

856 4 0 ǂu http://ezproxy.viu.ca/login?url=http://muse.jhu.edu/books/9780812204896/
[Institution-specific URI, including proxy server data]
856 4 0 ǂ3 Project MUSE ǂu http://muse.jhu.edu/books/9780812204896/
[The manipulated and now generally-accessible URI, after removing the proxy server data]

For any access method, a URI is generally recorded in subfield ǂu. 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:

  • 1st indicator = 4 for HTTP
  • Subfield ǂu = [HTTP URL]
  • Subfield ǂ3: data specifying to what the URI refers, if applicable

In the cooperative environment of WorldCat, you should follow the Provider-Neutral E-Resource MARC Record Guide: P-N/RDA Version when cataloging electronic resources. Regarding field 856, the P-N Guidelines specify:

  • Use subfield ǂu for URLs that are general, not institution-specific.
  • Do not use subfield ǂz for information that is institution-specific.
  • Subfield ǂ3 may be used to record package/provider name.
856 4 0 ǂ3 CRCnetBASE ǂu http://www.crcnetbase.com/isbn/9780203417461
856 4 0 ǂ3 Ebook Library ǂu http://public.eblib.com/choice/publicfullrecord.aspx?p=292768
856 4 0 ǂ3 Google ǂu http://books.google.com/books?id=g-aFghwICsgC

For URIs that are no longer active, use subfield ǂh.

If the original URI remains active, but the original resource is no longer available (that is, the URI represents an entirely different resource from the one described in the record, not merely a new iteration of it), place the URI in subfield ǂh and create a new bibliographic record for the new resource, if appropriate. Adjustments to other elements in field 856 may be needed.

1st Indicator

Access method. The access method to the electronic resource. If the resource is available by more than one access method, repeat the field with data appropriate to each method. The methods defined are the main TCP/IP (Transmission Control Protocol/Internet Protocol) protocols.

When recording a URI in subfield ǂu, the value corresponds to the access method (URI scheme) which is also the first element in the URI string.

The access methods with indicator values defined here, as well as those with coded values used in subfield ǂ2, are specified in Uniform Resource Locators (URL), a product of the Uniform Resource Identifiers Working Group of the Internet Engineering Task Force (IETF). The Internet Assigned Numbers Authority (IANA) maintains a registry of URL schemes and defines the syntax and use of new schemes.

 
blank character

No information provided. No information about the access method is provided. Value blank may be used if a URN alone is recorded in subfield ǂu.

856     doc1.lbfl.li ǂd /abb ǂf 960063.tif ǂz Image - Map, 1655
 
0

Email. Access to the resource is through electronic mail (email). Includes information on subscribing to an electronic journal or electronic forum through software intended to be used by an email system.

856 0   ǂu mailto:ejap@phil.indiana.edu ǂx ejap subscription
 
1

FTP. Access to the resource is through File Transfer Protocol (FTP).

856 1   ǂu ftp://path.net/pub/docs/urn2urc.ps
856 1   ǂu ftp://info.cern.ch/pub/www/doc;type=d
 
2

Remote login (Telnet). Access to the resource is through remote login (Telnet). You may include information in the subfields to enable users to connect to the resource electronically. This is equivalent to a URI telnet scheme.

856 2   ǂu telnet://pucc.princeton.edu
 
3

Dial-up. Access to the electronic resource is through a conventional telephone line (dial-up). Use subfields to record information that may enable the user to connect to the resource.

856 3   locis.loc.gov ǂb 140.147.254.3 ǂm lconline@loc.gov ǂt 3270 ǂt line mode (e.g., vt100) ǂv M-F 6:00 a.m.-21:30 p.m. USA EST, Sat 8:30-17:00 USA EST, Sun. 13:00-17:00 USA EST
 
4

HTTP. Access to the electronic resource is through Hypertext Transfer Protocol (HTTP).

856 4 0 ǂu http://jefferson.village.virginia.edu/pmc/contents.all.htm
 
7

Method specified in subfield ǂ2 . Access to the resource is through a method other than the defined values and for which an identifying code is given in subfield ǂ2.

856 7   ǂ3 b&w film copy neg. ǂd dag ǂf 3d01926 ǂ2 file

2nd Indicator

Relationship. Relationship between a networked electronic resource at the location identified in field 856 and the resource described in the record as a whole.

 
blank character

No information provided. No information is provided about the relationship of the networked electronic resource identified in field 856 to the bibliographic resource described by the record as a whole. Prefer use of the appropriate 2nd indicator numeric value instead of value blank.

 
0

Resource. Record describes a networked electronic resource. Electronic location in field 856 is for the complete networked electronic resource described by the record as a whole. If the electronic location in field 856 is for one or more component parts of the resource represented by the record as a whole, use 2nd indicator value 3.

245 1 0 Proceedings of the Seminar on Cataloging Digital Documents, October 12-14, 1994 / ǂc University of Virginia Library, Charlottesville, and the Library of Congress
856 4 0 ǂu https://www.loc.gov/catdir/semdigdocs/seminar.html ǂ7 0
245 1 0 Roswell / ǂc Federal Bureau of Investigation
300     1 online resource (1 unnumbered page) ǂb digital, PDF file
856 4 0 ǂu http://purl.access.gpo.gov/GPO/LPS98141 ǂ7 0
 
1

Version of resource. Record describes a tangible resource (e.g., a printed book or a CD-ROM). Electronic location in field 856 is for a networked electronic version of the resource described by the record as a whole. In this case, the bibliographic record itself does not represent the networked electronic resource but a networked electronic version is available.

245 0 0 American quarterly
300     volumes : ǂb illustrations ; ǂc 23 cm
856 4 1 ǂ3 Project Muse ǂu http://muse.jhu.edu/journals/american_quarterly/ ǂ7 1
245 0 0 Herbert Hoover National Historic Site, Iowa : ǂb Junior Ranger activity book
300     14 pages : ǂb illustrations (chiefly color) ; ǂc 28 cm
856 4 1 ǂu https://purl.fdlp.gov/GPO/gpo105955 ǂ7 0
 
2

Related resource. The electronic location in field 856 is for a networked 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. For resources that have only a subject relationship to the resource described, use 6xx fields. When there is uncertainty whether a resource may be a component part of the whole or a related resource, prefer 2nd indicator value 2.

Use subfield ǂ3 to further characterize the relationship between the electronic resource identified in field 856 and the resource represented by the bibliographic record. The display constant Related electronic resource: may be provided.

245 1 0 Shirley Jackson papers, ǂf 1932-1991 ǂg (bulk 1932-1965)
856 4 2 ǂ3 Finding aid ǂu http://hdl.loc.gov/loc.mss/eadmss.ms996001 ǂ7 0
245 1 0 White blood cells / ǂc the White Stripes
856 4 2 ǂ3 Cover image ǂu https://d2snwnmzyr8jue.cloudfront.net/wea_093624983514_180.jpeg ǂ7 0
100 1   Avila, Jennie, ǂe composer, ǂe lyricist, ǂe performer
245 1 0 Civil War stories in song / ǂc by Jennie Avila
500     Source stories, reference photos, and lyrics available online
856 4 2 ǂ3 Source stories, reference photos, lyrics ǂu http://www.jennieavila.com ǂ7 0
 
3

Component part(s) of resource. Record describes a networked electronic resource. Electronic location in field 856 is for one or more component parts of the complete electronic resource described by the record as a whole. The component parts are portions of the 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 networked electronic resource to be a component part. When appropriate, use subfield ǂ3 to specify the component part(s) to which the field applies. When there is uncertainty whether a resource may be a component part of the whole or a related resource, use 2nd indicator value 2.

245 1 0 Explosion and fire at the Macondo well (11 fatalities, 17 seriously injured, and serious environmental damage) : ǂb Deepwater Horizon rig, Mississippi Canyon Block #252, Gulf of Mexico, April 20, 2010 / ǂc US Chemical Safety and Hazard Investigation Board
300     1 online resource (2 volumes) : ǂb color illustrations
856 4 3 ǂ3 Volume 1 ǂu http://www.csb.gov/assets/1/7/Vol_1_Final.pdf ǂ7 0
856 4 3 ǂ3 Volume 2 ǂu http://www.csb.gov/assets/1/7/Vol_2_Final_Version.pdf ǂ7 0
 
4

Version of component part(s) of resource. Record describes a tangible resource (e.g., a printed book or a CD-ROM). Electronic location in field 856 is for a version of one or more component parts of the resource described by the record as a whole. The component parts are versions of portions of the resource, such as a table of contents or a sample chapter. When appropriate, use subfield ǂ3 to specify the component part(s) to which the field applies. When there is uncertainty whether a resource may be a component part of the whole or a related resource, prefer 2nd indicator value 2.

245 0 0 Analyzing qualitative data / ǂc edited by Alan Bryman and Robert G. Burgess
300     xii, 232 pages : ǂb illustrations ; ǂc 24 cm
856 4 4 ǂ3 Table of contents ǂu https://www.loc.gov/catdir/toc/93-3471.html ǂ7 0
245 1 0 Lettere e biglietti / ǂc Goliarda Sapienza ; a cura di Angelo Pellegrino
300     421 pages ; ǂc 22 cm
856 4 4 ǂ3 Table of contents only ǂu https://www.loc.gov/catdir/toc/cassalini18/4738323.pdf ǂ7 0
 
8

No display constant generated. The value that specifies that a display constant is not generated.

856 4 8 ǂu http://www.designandhealth.com

Subfields

 
ǂa Host name

The fully qualified domain (host name) of the electronic location. Repeat subfield ǂa if there is more than one address for the same host. Subfield ǂa is unlikely to be used in current cataloging.

856 1   harvarda.harvard.edu ǂa harvarda.bitnet
ǂc Compression information

The information about the compression of a file. If a specific program is required to decompress the file, it is noted here. Repeat subfield ǂc if two compression programs are used. Enter the latest compression first. Subfield ǂc is unlikely to be used in current cataloging.

856 1   maine.maine.edu ǂc Must be decompressed with PKUNZIP ǂf resource.zip
ǂd Path

The series of logical directory and subdirectory names in which the file is stored. Use subfield ǂf for the file name itself. Use subfield ǂd for a surrogate path to the host in which complete and current access information is stored in a locator table. Subfield ǂd is unlikely to be used in current cataloging.

856 4 1 ǂ3 digital file from original ǂd ds ǂf 15285 ǂu https://hdl.loc.gov/loc.pnp/ds.15285 ǂ7 0
ǂe Data provenance

For information about subfield ǂe, see the Data Provenance Subfields section of Control Subfields.

ǂf Electronic name

The electronic name of a file as it exists in the directory/subdirectory indicated in subfield ǂd on the host identified in subfield ǂa. Repeat subfield ǂf if a single logical file has been divided into parts and stored under different names. In this case, the separate parts should constitute a single bibliographic item. In all other cases, for a file that may be retrieved under different filenames, use multiple occurrences of field 856, each with its corresponding electronic name in subfield ǂf. Subfield ǂf is unlikely to be used in current cataloging.

856 1   wuarchive.wust1.edu ǂd mirrors/info-mac/util ǂf color-system-icons.hqx

File names may include wildcard characters (e.g., * or ?). Use subfield ǂz to explain how the files are named.

ǂg Persistent identifier

Persistent identifier (PID) assigned to the resource for automated access and other resolution services by a PID resolver. PIDs should be provided as actionable hyperlinks (e.g., HTTP URI format).

If a PID resolves to more than one URI, these URIs may be provided in the same field 856, with repeated subfields ǂu.

856 4 0 ǂg https://urn.fi/URN:ISBN:978-952-12-4129-1 ǂu https://www.doria.fi/handle/10024/182600 ǂq application/pdf ǂq https://www.nationalarchives.gov.uk/PRONOM/fmt/276 ǂ7 0
ǂh Non-functioning Uniform Resource Identifier

URI that is no longer functional, for example, due to link rot, content drift, etc.

Subfield ǂh may be repeated if there is more than one non-functioning URI. A note on the status change (including the date) may be added in either subfield ǂx or subfield ǂz, depending on the local policy.

856 4 0 ǂh http://mathnet.kaist.ac.kr ǂu http://www.koreascience.or.kr/journal/E1TAAE/v2n1.page ǂu http://www.ksiam.org/ ǂ7 0
ǂi Instruction

Obsolete. Do not use.

ǂl Standardized information governing access

Contains standardized information about the access status of a resource. The information may be in the form of a value from a controlled vocabulary, or a URI. If the information is a value from a controlled vocabulary, it is preceded by the appropriate value from the list of Access Restriction Term Source Codes, enclosed in parentheses. When the information is given in the form of a Web retrieval protocol, e.g., HTTP URI, no preceding parenthetical is used.

This subfield is intended to contain information that is equivalent to the data recorded in field 506 subfields ǂf, ǂu, and ǂ2.

856 4 0 ǂl (star)Unrestricted online access ǂu http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-156421 ǂ7 0
ǂm Contact for access assistance

The contact person at the host specified in subfield ǂa. For addresses relating to the content of the resource itself (i.e., the item represented by the title recorded in field 245) rather than access assistance, use field 270. Also use field 270 if the address data is the same. Subfield ǂm is unlikely to be used in current cataloging.

856 2   gopac.berkeley.edu ǂm Roy Tennant
ǂn Terms governing access

Contains textual information about the access status of a resource.

This subfield is intended to contain information that is equivalent to the data recorded in field 506 subfield ǂa.

856 4 0 ǂl (star)Unrestricted online access ǂn Open access ǂr (cc)CC BY-NC-ND 4.0 ǂu https://ojs.uv.es/index.php/qfilologia/issue/view/1146 ǂ7 0
ǂo Operating system

The operating system used by the host specified in subfield ǂa. Conventions for the path and filenames may be dependent on the operating system of the host. For the operating system of the resource itself (i.e., the item represented by the title recorded in field 245), use field 753 subfield ǂc. Subfield ǂo is unlikely to be used in current cataloging.

856 1   seq1.loc.gov ǂd /pub/soviet.archive ǂf k1famine.bkg ǂo UNIX
ǂp Port

The part of the address that contains the process or service in the host. Subfield ǂp is unlikely to be used in current cataloging.

856 2   madlab.sprl.umich.edu ǂp 3000
ǂq Electronic format type

Identification of the electronic format type and version. Electronic format type should be specified with a code from the list of registered Internet Media Types (MIME types), taken from IANA Media Types.

856 4 1 ǂu https://wwwnc.cdc.gov/eid/ ǂq text/html ǂ7 0

If necessary (e.g., in order to specify a file format version to support access or digital preservation) additional information, such as PRONOM Unique Identifier (PUID) codes, may be included in addition to the information provided by the MIME Type by repeating subfield ǂq.

856 4 0 ǂh http://mathnet.kaist.ac.kr ǂu http://www.koreascience.or.kr/journal/E1TAAE/v2n1.page ǂu http://www.ksiam.org/ ǂ7 0
ǂr Standardized information governing use and reproduction

Contains standardized information about the use and reproduction rights of a resource. The information may be in the form of a value from a controlled vocabulary, or a URI. If the information is a value from a controlled vocabulary, it is preceded by the appropriate value from the list of Access Restriction Term Source Codes, enclosed in parentheses. When the information is given in the form of a Web retrieval protocol, e.g., HTTP URI, no preceding parenthetical is used.

This subfield is intended to contain information that is equivalent to the data recorded in field 540 subfields ǂf, ǂu, and ǂ2.

856 4 0 ǂl (star)Unrestricted online access ǂn Open access ǂr (cc)CC BY-NC-ND 4.0 ǂr https://creativecommons.org/licenses/by-nc-nd/4.0/ ǂt Attribution-NonCommercial-NoDerivatives 4.0 International ǂq application/pdf ǂu https://freidok.uni-freiburg.de/data/14656 ǂ7 0
ǂs File size

The size of the file stored under the file name indicated in subfield ǂf. Size is generally expressed in terms of 8-bit bytes (octets). Repeat subfield ǂs and place it after the subfield ǂf to which it applies, if needed. Do not enter this information for electronic journals since the field relates to the entire title, not to a particular issue. Subfield ǂs is unlikely to be used in current cataloging.

856 0   keptvm.bitnet ǂf acadlist file1 ǂs 34,989 bytes ǂf acadlist file2 ǂs 32,876 bytes ǂf acadlist file3 ǂs 23,987 bytes
ǂt Terms governing use and reproduction

Contains textual information about the use and reproduction rights of a resource.

This subfield is intended to contain information that is equivalent to the data recorded in field 540 subfield ǂa.

856 4 0 ǂl (star)Unrestricted online access ǂn Open access ǂr (cc)CC BY-NC-ND 4.0 ǂr https://creativecommons.org/licenses/by-nc-nd/4.0/ ǂt Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International license ǂu http://dx.doi.org/10.15496/publikation-40790 ǂ7 0
ǂu Uniform Resource Identifier

The Uniform Resource Identifier (e.g., a URL or URN) provides electronic access data in a standard syntax. Use for automated access to an electronic item using one of the Internet protocols or by resolution of a persistent identifier (PID). The structure of field 856 allows for the creation of a URI from the concatenation of the other field 856 subfields. Use subfield ǂu instead of those separate subfields or in addition to them. Repeat subfield ǂu if the digital object has multiple identifiers (URIs).

URIs that no longer function to provide access to the described resource may be transferred to field 856 subfield ǂh.

856 1   ǂu ftp://path.net/pub/docs/urn2urc.ps
856 4 0 ǂu http://oclc.org/bibformats/en.html ǂ7 0
856 4 0 ǂ3 PsycBOOKS ǂu http://content.apa.org/books/2009-08050-000 ǂ7 1
856 4 0 ǂ3 Google ǂu http://books.google.com/books?id=7sfmOiy-1IkC ǂ7 0
856 4 0 ǂu http://bibpurl.oclc.org/web/24285/2008/wp08208.pdf ǂu http://www.imf.org/external/pubs/ft/wp/2008/wp08208.pdf ǂ7 0
856 4 0 ǂ3 CRCnetBASE ǂu http://dx.doi.org/10.1201/b15870 ǂ7 1
856 4 1 ǂu http://nbn-resolving.de/urn/resolver.pl?urn=urn:nbn:de:bvb:12-bsb00010820-1 ǂ7 0
856 4 0 ǂu http://hdl.loc.gov/loc.rbc/jeff.16823 ǂ7 0
856 4 0 ǂu http://www.ncjrs.gov/pdffiles1/nij/209800.pdf ǂu http://purl.access.gpo.gov/GPO/LPS73296 ǂ7 0

Enter generally-accessible URIs whenever possible. Do not enter an institution-specific URI in field 856 in WorldCat records unless no other URI is available, following the instructions in the Guidelines.

For more information about subfield ǂu, see Control Subfields.

ǂv Hours access method available

The hours that access to the electronic resource indicated in field 856 is available. For systems and services, use field 307, not subfield ǂv. Subfield ǂv is unlikely to be used in current cataloging.

856 2   pac.carl.org ǂb 192.54.81.128 ǂm CARL Situation Room ǂm help@CARL.org ǂn CARL Systems, Inc., Denver, CO ǂv 24 hours
ǂw Record control number

The system control number of the related record. Precede the number with a MARC code for the agency to which the control number applies. Enclose the MARC agency code in parentheses. The data in subfield ǂw links field 856 to the MARC record having the same data in a control number field. See MARC Code List for Organizations, which includes links to Canadian, United Kingdom, and German MARC Organization Code lists. Subfield ǂw is unlikely to be used in current cataloging. Prefer use of field 776 for links to related records.

856 4 2 ǂu https://rosap.ntl.bts.gov/view/dot/9629 ǂw (OCoLC)812477708 ǂz Online Version (PDF), Volume 1 ǂ7 0
ǂx Nonpublic note

A note pertaining to the electronic location of the source identified in the field that is in a form not adequate for public display. A nonpublic note may contain processing information about the file at the location specified.

856 1   wuarchive.wust1.edu ǂc decompress with PKUNZIP.exe ǂd /mirrors2/win3/games ǂf atmoids.zip ǂx cannot verify because of transfer difficulty
ǂy Link text

Used for display in place of the URL in subfield ǂu. When subfield ǂy is present, applications should use the contents of subfield ǂy as the link instead of the content of subfield ǂu when linking to the destination in subfield ǂu. The use of the link text is independent of any decision concerning the second indicator value.

856 4   ǂu http://fdl.fcla.edu:80/cgi-bin/cgiwrap/fdl/fdlcgi/ZKVIEWFA00000011/file2.pdf ǂy Electronic resource (PDF)
ǂz Public note

A note pertaining to the electronic location of the source identified in the field that is in a form adequate for public display.

856 4 1 ǂu http://firstsearch.oclc.org ǂz Address for accessing the journal using authorization number and password through OCLC FirstSearch Electronic Collections Online. Subscription to online journal required for access to abstracts and full text
ǂ2 Access method

The code defined for use with 1st indicator value 7. Use subfield ǂ2 to record access methods other than the main TCP/IP protocols specified in the 1st indicator. Code from Electronic Access Methods Code List.

The data in this subfield correspond with the access schemes specified in Uniform Resource Locators (URL), a product of the Uniform Resource Identifiers Working Group of the Internet Engineering Task Force (IETF). The Internet Assigned Numbers Authority (IANA) maintains a registry of URL schemes and defines the syntax and use of new schemes.

856 7 0 ǂu gopher://gopher.lib.virginia.edu:70/00/alpha/bmcr ǂ2 gopher
856 7 0 ǂu sip:alice@atlanta.com?subject=project%20x&priority=urgent ǂ2 sip
ǂ3 Materials specified

For information about subfield ǂ3, see Control Subfields.

856 4 2 ǂ3 Finding aid ǂu http://www.bsu.edu/libraries/archives/findingaids/MSS051.pdf ǂ7 0
856 4 4 ǂ3 Table of contents ǂu http://catdir.loc.gov/catdir/toc/ecip0413/2004000025.html ǂ7 0
856 4 2 ǂ3 Author's list of corrections, adjustments, and additions ǂu http://personalpages.manchester.ac.uk/staff/david.fallows/appendix.pdf ǂ7 0
ǂ6 Linkage

Data that link fields when non-Latin script is entered. This subfield is system supplied and does not appear in OCLC online displays. Do not manually add subfield ǂ6. For more information about subfield ǂ6, see Control Subfields.

ǂ7 Access status

Code indicating the availability of access to the networked electronic resource, the address of which appears in subfield ǂu. Subfield ǂ7 applies to all subfields ǂu present in the field. For more information about subfield ǂ7, see Control Subfields.

The code values are:

   0 - Open access. The networked electronic resource is freely and openly accessible online to everyone, without restriction, login, or payment.
   1 - Restricted access. The networked electronic resource is not freely and openly accessible online.
   u - Unspecified
   z - Other

856 4 0 ǂ3 HathiTrust Digital Library, Full view ǂu http://catalog.hathitrust.org/api/volumes/oclc/1654047.html ǂ7 0
ǂ8 Field link and sequence number

For information about subfield ǂ8, see Control Subfields.

Indexing

For indexing and searching information, see Searching WorldCat Indexes, field 856.

MARC 21

For more information, including content designator history, see MARC 21 Format for Bibliographic Data, field 856.