Field definition and scope:

Field 856 contains the information needed to locate and access an electronic resource.  The field may be used in a bibliographic record for a resource when that resource or a subset of it is available electronically.  In addition, it may be used to locate and access an electronic version of a non-electronic resource described in the bibliographic record or a related electronic resource.

Field 856 is repeated when the location data elements vary (the URL in subfield $u or subfields $a, $b, $d when used).  It is also repeated when more than one access method is used, different portions of the item are available electronically, mirror sites are recorded, different formats/resolutions with different URLs are indicated, and related items are recorded.

The National level record requirement for this field is Optional.

Field 856 is repeatable.

See also:  Guidelines for the Use of Field 856 or check online at:  www.loc.gov/marc/856guide.html.

Guidelines for applying content designators:

For indicator and subfield code definitions and examples, National-level (NLR) and Minimal-level (MLR) record requirements, and designator repeatability, see table below:

Position

Description

NLR

MLR

Repeatability

Field 856

Electronic Location and Access

O

O

R

Indicator:

 

 

 

 

First

Access method

M

 

 

#

No information provided

A

 

 

0

Email

A

 

 

1

FTP

A

 

 

2

Remote login (Telnet)

A

 

 

3

Dial-up

A

 

 

4

HTTP

A

 

 

7

Method specified in subfield $2

A

 

 

 

 

 

 

 

Second

Relationship

M

 

 

#

No information provided

A

 

 

0

Resource

A

 

 

1

Version of resource

A

 

 

2

Related resource

A

 

 

8

No display constant generated

A

 

 

 

 

 

 

 

Subfield code:

 

 

 

 

$a

Host name

A

O

R

$b

Access number

A

O

R

$c

Compression information

A

O

R

$d

Path

A

O

R

$f

Electronic name

A

O

R

$h

Processor of request

A

O

NR

$i

Instruction

O

O

R

$j

Bits per second

A

O

NR

$k

Password

A

O

NR

$l

Logon

A

O

NR

$m

Contact for access assistance

O

O

R

$n

Name of location of host

A

O

NR

$o

Operating system

A

O

NR

$p

Port

A

O

NR

$q

Electronic format type

A

O

NR

$r

Settings

A

O

NR

$s

File size

O

O

R

$t

Terminal emulation

A

O

R

$u

Uniform Resource Identifier

A

O

R

$v

Hours access method available

A

O

R

$w

Record control number

O

O

R

$x

Nonpublic note

O

O

R

$y

Link text

O

O

R

$z

Public note

O

O

R

$2

Access method

A

O

NR

$3

Materials specified

A

O

NR

$6

Linkage

A

O

NR

$8

Field link and sequence number

O

O

R

 

See:  Examples for this field.

Full record examples for this field.

Input conventions:

Embedded Holdings Information

Display constants

Spacing underscore and tilde in URLs

Style for recording telephone numbers

Content designator history:

Subfield $q - Electronic format type  [redefined]:  Prior to 1997, subfield $q was defined as File transfer mode to contain an indication of whether the file was transferred as binary or ASCII.  It was redefined to contain type of electronic format.

Subfield $g - Uniform Resource Name  [obsolete]:  Prior to 1997, subfield $g was defined as Electronic name -- End of range.  Because it was rarely if ever used, it was redefined as Uniform Resource Name.  It was made obsolete in 2000 in favor of recording the URN in subfield $u.

Subfield $u - Uniform Resource Locator  [repeatability changed]:  Prior to 1999, subfield $u was defined as repeatable.  It was changed to non-repeatable in favor of repeating the field due to ambiguity in determining when the subfield could be repeatable.

Subfield $u - Uniform Resource Identifier  [redefined and repeatability changed]:  In 1999, subfield $u was renamed from Uniform Resource Locator to Uniform Resource Identifier in order to combine the function of subfields $u and $g, making subfield $g obsolete.  The use of subfield $u was then redefined to include both URLs and URNs, and to change the subfield to repeatable, with stipulations.

Subfield $y - Link text  [defined]:  In 2000, subfield $y was defined to use for display in place of the URL in subfield $u.

Related MARC fields or documents:

753  System Details Access to Computer Files

Uniform Resource Locators (URL) (RFC 1738)

MARC Code List for Organizations

Value Lists for Codes and Controlled Vocabularies:

Electronic Access Methods Code List

See also:

841-89X  Holdings, Alternate Graphics, Etc.

Variable Data Fields