Field definition and scope:

Field 856 contains the information needed to locate and access electronic information.  The field may be used in a classification 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 classification record or a related electronic resource.  This field may also be used to link to an electronic resource intended to supplement the classification scheme, e.g., an image of a map.

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, mirror sites are recorded, different formats/resolutions with different URLs are indicated, and related items are recorded.

Field 856 is repeatable.

See the Guidelines for the Use of Field 856 for a more thorough discussion on the use of field 856.  It is located online at:  www.loc.gov/marc/856guide.html.

Guidelines for applying content designators:

For indicator and subfield code definitions and examples, and designator repeatability, see table below:

Position

Description

Repeatability

Field 856

Electronic Location and Access

R

Indicator:

 

 

First

Access method

 

#

No information provided

 

0

Email

 

1

FTP

 

2

Remote login (Telnet)

 

3

Dial-up

 

4

HTTP

 

7

Method specified in subfield $2

 

 

 

 

Second

Relationship

 

#

No information provided

 

0

Resource

 

1

Version of resource

 

2

Related resource

 

8

No display constant generated

 

 

 

 

Subfield code:

 

 

$a

Host name

R

$b

Access number

R

$c

Compression information

R

$d

Path

R

$f

Electronic name

R

$h

Processor of request

NR

$i

Instruction

R

$j

Bits per second

NR

$k

Password

NR

$l

Logon

NR

$m

Contact for access assistance

R

$n

Name of location of host

NR

$o

Operating system

NR

$p

Port

NR

$q

Electronic format type

NR

$r

Settings

NR

$s

File size

R

$t

Terminal emulation

R

$u

Uniform Resource Identifier

R

$v

Hours access method available

R

$w

Record control number

R

$x

Nonpublic note

R

$y

Link text

R

$z

Public note

R

$2

Access method

NR

$3

Materials specified

NR

$6

Linkage

NR

$8

Field link and sequence number

NR

 

See:  Example for this field.

Input conventions:

Spacing underscore and tilde in URLs

Style for recording telephone numbers

Content designator history:

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

Subfield $u - Uniform Resource Identifier  [renamed, 2000]:  Prior to 1999, subfield $u was defined as Uniform Resource Locator and was repeatable.  It was changed to not repeatable because of ambiguity in determining when the subfield could be repeatable.  Subfield $u was changed back to repeatable and renamed Uniform Resource Identifier in 2000 to record both URLs and URNs after subfield $g was made obsolete.

Subfield $y - Link text  [new, 2000]

Related MARC fields or documents:

MARC 21 Format for Bibliographic Data:

856  Electronic Location and Access

Value Lists for Codes and Controlled Vocabularies:

Electronic Access Methods Code List

See also:

8XX  Other Variable Fields

Variable Data Fields