856 - Electronic Location and Access (R)
MARC 21 Authority - Concise
2008
This is an ARCHIVED VERSION of the
2008 electronic edition of the MARC 21 Concise
Formats. Please see loc.gov/marc/concise/
for the most up-to-date version of the electronic MARC 21
Concise Formats.
Information needed to locate and access electronic
information. The field may be used in an authority record to
provide supplementary information available electronically
about the entity for which the record was created.
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.
See the Guidelines for the Use
of Field 856 for a more thorough discussion on the use
of field 856.
Indicators
First - Access methodValue that defines the access method to
the electronic resource. If the resource is available by more
than one access method, the field is repeated with data
appropriate to each method. When recording a URL in subfield
$u, the value corresponds to the access method (URL scheme),
which is also the first element in the URL string.
# - No information provided
0 - Email
1 - FTP
2 - Remote login (Telnet)
3 - Dial-up
4 - HTTP
7 - Method specified in subfield $2
Second - RelationshipRelationship between the electronic
resource at the location identified in field 856 and the
entity described in the record.
# - No information provided
0 - Resource
1 - Version of resource
2 - Related resource
8 - No display constant generated
Do not apply these indicator values to authority
records.
Subfield Codes
$a - Host name (R)
Fully qualified domain (host name) of the electronic
location. It contains a network address which is repeated
if there is more than one address for the same host.
$b - Access number (R)
Access number associated with a host. It can contain the
Internet Protocol (IP) numeric address if the item is an
Internet resource, or a telephone number if dial-up access
is provided through a telephone line. This data may change
frequently and may be generated by the system, rather than
statically stored.
$c - Compression information (R)
Information about the compression of a file, in particular,
whether a specific program is required to decompress the
file.
$d - Path (R)
$f - Electronic name (R)
$h - Processor of request (NR)
Username, or processor of the request; generally the data
which precedes the at sign (@) in the host
address.
$i - Instruction (R)
Instruction or command needed for the remote host to
process a request.
$j - Bits per second (NR)
$k - Password (NR)
$l - Logon (NR)
Characters needed to connect (i.e., logon,
login, etc.) to an electronic resource or FTP
site. Used to record general-use logon strings which do not
require special security.
$m - Contact for access assistance (R)
$n - Name of location of host (NR)
Conventional name of the location of the host in subfield
$a, including its physical (geographic) location.
$o - Operating system (NR)
$p - Port (NR)
Portion of the address that identifies a process or service
in the host.
$q - Electronic format type (NR)
Identification of the electronic format type, which is the
data representation of the resource, such as text/HTML,
ASCII, Postscript file, executable application, or JPEG
image. Electronic format type may be taken from enumerated
lists such as registered Internet Media Types (MIME types).
$r - Settings (NR)
$s - File size (R)
$t - Terminal emulation (R)
$u - Uniform Resource Identifier (R)
Uniform Resource Identifier (URI), which provides standard
syntax for locating an object using existing Internet
protocols or by resolution of a URN. Field 856 is
structured to allow for the creation of a URL from the
concatenation of other separate 856 subfields. Subfield $u
may be used instead of those separate subfields or in
addition to them. May be repeated only if both a URN or a
URL or more than one URN are recorded.
$v - Hours access method available (R)
$w - Record control number (R)
$x - Nonpublic note (R)
$y - Link text (R)
Link text is used for display in place of the URL in
subfield $u (Uniform resource identifier). When subfield $y
is present, applications should use the contents of it as
the link instead of subfield $u linking to the destination
in subfield $u.
$z - Public note (R)
$2 - Access method (NR)
Access method when the first indicator position contains
value 7 (Method specified in subfield $2).
$3 - Materials specified (NR)
$8 - Field link and sequence number (R)
Examples
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856 |
4#$uhttp://plato.stanford.edu/entries/russell/russell.jpeg
$yphotograph |
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856 |
4#$uhttp://www.ibiblio.org/wm/paint/auth/vinci/joconde/
$ydescription |
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856 |
4#$3image$uhttp://www.ibiblio.org/wm/paint/auth/vinci/joconde/joconde.jpg |
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856 |
4#$uhttp://www.loc.gov/copyright |
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856 |
4#$uhttp://www.collectionscanada.ca/jsc/ |
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856 |
4#$uhttp://www.firstladies.org/ |
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