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856 Electronic Location and Access (O;R)

Field Definition and Scope

This field contains the information required to locate an electronic item. The information identifies the electronic location containing the item or from which it is available. It also contains information to retrieve the item by the access method identified in the first indicator position.

Application of Content Designators


Indicator 1: undefined (blank) Specifies the access method: * # No information provided * 0 Email * 1 FTP * 2 Remote login (Telnet) * 3 Dial-up * 4 HTTP * 7 Method specified in subfield $y

Indicator 2: none


$1 Sort indicator (O;NR)
A two-digit numeral indicating the order of repeated fields.

$6 Source file reference (NR)
This subfield must not be input manually, it is added in an automated updating process only and shall be removed after manual amendment of the record.

$a Host name (O;R)
e.g. www.cerl.org

$e Nonpublic note (O;NR)
This note is visible only in the tagged display of the record.

$g Uniform Resource Name (O;NR)
The URN, which provides a globally unique location independent identifier.

$h Processor of request (A;NR)
The username, or processor of the request; generally the data which precedes the at sign (“@”) in the host address.

$n Plain name of host as given in $a (O;NR)
e.g. Consortium of European Research Libraries, London

$u Uniform Resource Locator (O;NR)
The Uniform Resource Locator (URL), which provides electronic access data in a standard syntax. Instead of the URL leading up to the online resource you may file here the URL of the resolution service for the URN given in $g. In this case the URN is to be repeated as last part of the URL.

$y Access method (A;NR)
The access method when the first indicator position contains value 7 (Method specified in subfield $y). This subfield may include access methods other than the main TCP/IP protocols specified in the first indicator. The data in this subfield corresponds with the access schemes specified in Uniform Resource Locators (URL) (RFC 1738), a product of the Uniform Resource Identifiers Working Group of the IETF. The Internet Assigned Numbers Authority (IANA) maintains a registry of URL schemes and defines the syntax and use of new schemes.

$8 Language Code (O;R)
Must precede any subfield $z. See the description of numerical subfields.

$z Public note (O;R)
Please use English language for this note.

Input Conventions


 1. 856 ##$nUnion catalogue of Swedish libraries$uhttp://websok.libris.kb.se
          /websearch/search?SEARCH_NUMM=7665205$8eng$zBibliographic record

Internal Representation

{"data": {"extResource": [{
    "display": "Display text ($n)",
    "note": [{
        "text": "Public note ($z)",
        "lang": "Language code ($8)"
    "url": "URL ($u)",
    "urn": "URN ($g)",
    "remark": "Non-Public note ($e)"

Change History

  • 17.07.2017: First indicator position values will no longer be supported once the CT has been migrated into its new environment.
  • 17.07.2017: Subfields $1, $6, $a, $h and $y will no longer be supported once the CT has been migrated inot its new environment. Any content of subfield $a will be mapped to subfield $n during ingest if no subfield $n is present.
  • 17.07.2017: Subfields $e, $g, $n and $u are no longer repeatable, once the CT has been migrated into its new environment.
  • 17.07.2017: New subfield $8 has been added.
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 resources/cerl_thesaurus/editing/format/856.txt · Last modified: 2017/07/17 17:54 by jahnke



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