856 - Electronic Location and Access (R)
MARC 21 Classification - Concise
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. The information contained in this field is sufficient to allow for the
electronic transfer of a file, subscription to an electronic journal, or logon to a
In MARC 21 classification records, this field may be used to link an electronic resource
intended to supplement the classification scheme, such as an image of a map in a table
related to the classification of geographic names.
Field 856 is repeated when the location elements vary (the URL in subfields
$a, $b, $c 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.
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
$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
$b - Access number (R)
Access number associated with a host. Can be an Internet Protocol (IP) numeric
address , or a telephone number if dial-up access is provided through a telephone
line. This data changes frequently and may be generated by the system, rather than
$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. 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. Subfield $u 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)
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)
$3 - Materials specified (NR)
$8 - Field link and sequence number (NR)
||7#$uhttp://minaret.loc.gov/images/gschedule/G1350a.gif$yMap of West south central states