Library of Congress >> MARC >> Holdings >> 852 & 856 >> 856

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
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 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 subfield $u.
$z - Public note (R)
$2 - Access method (NR)
Access method when the first indicator value contains value 7 (Method specified in subfield $2).
$3 - Materials specified (NR)
$6 - Linkage (NR)
See the description of this subfield in Appendix A: Control Subfields.
$8 - Field link and sequence number (R)
See the description of this subfield in Appendix A: Control Subfields.
856 41$u
856 40$u$qtext/html
856 41$u$x
856 1#$u$kguest
856 42$3Finding aid$u
856 42$3French version$u
856 42$3Essays from annual reports$u
856 1#$u$s16874 bytes
856 1#$u$cdecompress with PKUNZIP.exe$xcannot verify because of transfer difficulty
856 4#$zPart of the Ovid Mental Health Collection (MHC). Follow instructions on MedMenu page for Ovid login.$u
856 40$u$zAddress for accessing the journal using authorization number and password through OCLC FirstSearch Electronic Collections Online. Subscription to online journal required for access to abstracts and full text
856 4#$u$yElectronic resource (JPEG)
856 4#$u$yElectronic resource (PDF)
856 2#$$b128.101.95.23
856 1#$$cMust be decompressed with PKUNZIP$
856 0#$akentvm.bitnet$facadlist file1$facadlist file2$facadlist file3
856 0#$auicvm.bitnet$fAN2$hListserv
856 2#$$nUniversity of Michigan Weather Underground$p3000

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