856 - Electronic Location and Access (R)
MARC 21 Holdings - Concise
Information required to locate an electronic resource. The information identifies the
electronic location containing the resource or from which it is available. It also
contains information needed to retrieve the resource by the access method identified in
the first indicator position. The relationship of the electronic location and access
information in field 856 to the resource identified by the record as a whole is
identified by the second indicator. 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 an electronic resource. In some cases, only unique data elements
are recorded which allow the user to access a locator table on a remote host containing
the remaining information needed to access the 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.
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. 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 changes frequently
and may be generated by the system, rather than statically stored.
$c - Compression information (R)
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 one of the 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. 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)
Link text used for display in place of the URL in subfield $u. When
subfield $y is present, applications should use the contents of it as
the link instead of subfield $u when linking to the destination in
$z - Public note (R)
$3 - Materials specified (NR)
$8 - Field link and sequence number (R)
||42$3Essays from annual reports$uhttp://woodrow.mpls.frb.fed.us/pubs/ar/index.html
||1#$uftp://wuarchive.wustl.edu/mirrors2/win3/games/atmoids.zip$cdecompress with PKUNZIP.exe$xcannot verify because of transfer
||4#$zPart of the Ovid Mental Health Collection (MHC). Follow
instructions on MedMenu page for Ovid login.$uhttp://info.med.yale.edu/medmenu/info%5Fcbc.html
||40$uhttp://www.ref.oclc.org:2000$zAddress for accessing the journal using authorization
number and password through OCLC FirstSearch Electronic Collections Online.
Subscription to online journal required for access to abstracts and full
||4#$uhttp://susdl.fcla.edu/cgi-bin/cgiwrap/~fdl/fdlcgi?FA00000011%2Fjpg$yElectronic resource (JPEG)
||4#$uhttp://susdl.fcla.edu/cgi-bin/cgiwrap/~fdl/fdlcgi?FA00000011%2Fpdf$yElectronic resource (PDF)
||1#$amaine.maine.edu$cMust be decompressed with PKUNZIP$fresource.zip
||0#$akentvm.bitnet$facadlist file1$facadlist file2$facadlist file3
||2#$amadlab.sprl.umich.edu$nUniversity of Michigan Weather Underground$p3000