856  Electronic Location and Access (R)

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.

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.

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.

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

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.

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

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.

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.

Obsolete. Do not use.

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.

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.

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.

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.

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

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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.

For information about subfield ǂ3, see Control Subfields.

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.

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

For information about subfield ǂ8, see Control Subfields.