856 - Electronic Location and Access (R)
MARC 21 Holdings - Full
October 2003
First Indicator
Access method
# - No information provided
0 - Email
1 - FTP
2 - Remote login (Telnet)
3 - Dial-up
4 - HTTP
7 - Method specified in subfield $2
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Second Indicator
Relationship
# - No information provided
0 - Resource
1 - Version of resource
2 - Related resource
8 - No display constant generated
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Subfield Codes
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$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)
$p - Port (NR)
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$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 (R)
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FIELD DEFINITION AND SCOPE
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.
This field is identical to field 856 (Electronic Location and Access) defined in the
MARC 21 Format for Bibliographic Data.
GUIDELINES FOR APPLYING CONTENT DESIGNATORS
■ INDICATORS
First Indicator - Access method 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 string.
The methods defined are the main TCP/IP (Transmission Control Protocol/Internet
Protocol) protocols.
# - No information provided Used when subfield $u contains a URN and there is no URL recorded.
When subfield $u contains a URL and the subfield is repeated with a
URN, the indicator value for the appropriate access method of the URL is
given.
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| 856 |
##$uurn:doi:10.1000/100
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0 - Email Access to the electronic resource is through electronic mail (email). Includes
subscribing to an electronic journal or electronic forum through software
intended to be used by an email system.
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| 856 |
0#$umailto:ejap@phil.indiana.edu$iejap subscription
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1 - FTP Access is through the File Transfer Protocol (FTP).
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| 856 |
1#$uftp://path.net/pub/docs/urn2urc.ps
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2 - Remote login (Telnet)
3 - Dial-up Access is through a conventional telephone line (dial-up).Additional information in subfields of the record may enable the user to
connect to the resource.
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| 856 |
3#$alocis.loc.gov$b140.147.254.3$mlconline@loc.gov$t3270$tline mode (e.g., vt100)$vM-F 6:00 a.m.-21:30 p.m. USA EST, Sat. 8:30-17:00
USA EST, Sun. 13:00-17:00 USA EST
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4 - HTTP Access is through the Hypertext Transfer Protocol (HTTP).
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| 856 |
40$uhttp://jefferson.village.virginia.edu/pmc/contents.all.html
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| 856 |
4#$uhttp://hdl.handle.net/loc.test/gotthome$uurn:hdl.loc.test/gotthome
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7 - Method specified in subfield $2 Access is through a method other than the defined values and for which an
identifying code is given in subfield $2 (Source of access).
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| 856 |
7#$3b&w film copy neg.$ddag$f3d01926$2file
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Second Indicator - Relationship Relationship between the electronic resource at the location specified in field
856 and the item described in the record as a whole.
Used to provide further information about the relationship if it is not a
one-to-one relationship.
# - No information provided
0 - Resource Electronic location in field 856 is for the same resource described by the
record as a whole. In this case, the item represented by the bibliographic
record is an electronic resource. If the data in field 856 relates to a
constituent unit of the resource represented by the record, subfield
$3 is used to specify the portion(s) to which the field applies. The
display constant
Electronic resource: may be generated.
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| 856 |
40$uhttp://lcweb.loc.gov/catdir/semdigdocs/seminar.html
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1 - Version of resource Location in field 856 is for the same resource described by the record as a
whole. In this case, the item represented by the bibliographic record is not
electronic but an electronic version is available. If the data in field 856
relates to a constituent unit of the resource represented by the record,
subfield $3 is used to specify the portion(s) to which the field
applies. The display constant
Electronic version: may be
generated.
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| 856 |
41$uhttp://muse.jhu.edu/journals/american%5Fquarterly/
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| 856 |
41$3Table of contents$uhttp://lcweb.loc.gov/catdir/toc/93-3471.html
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2 - Related resource Location in field 856 is for an electronic resource that is related to the
bibliographic item described by the record. In this case, the item represented
by the bibliographic record is not the electronic resource itself. Subfield
$3 can be used to further characterize the relationship between the
electronic item identified in field 856 and the item represented by the
bibliographic record as a whole. The display constant
Related electronic
esource: may be generated.
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| 856 |
42$3Finding aid$uhttp://lcweb2.loc.gov/ammem/ead/jackson.sgm
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8 - No display constant generated
■ SUBFIELD CODES
$a - Host name 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 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.
May be repeated if all the other information in the field applies.
$c - Compression information In particular, whether a specific program is required to decompress the file.
May be repeated if two compression programs are used, noting the latest
compression first.
$d - Path Path, the series of logical directory and subdirectory names that
indicate where a file is stored. The filename itself is recorded in subfield
$f. This may be a surrogate path leading the user to the host where
complete and current access information is stored in a locator table.
$f - Electronic name Electronic name of a file as it exists in the directory/subdirectory indicated in
subfield $d on the host identified in subfield $a. May be
repeated if a single logical file has been divided into parts and stored under
different names. In this case, the separate parts should constitute a single
bibliographic item. In all other cases, a file that may be retrieved under
different filenames contains multiple occurrences of field 856, each with its
corresponding electronic name in subfield $f. A filename may include
wildcard characters (e.g., * or ?) if applicable. Use subfield $z to
explain how files are named, if needed.
$h - Processor of request Username, or processor of the request; generally the data which precedes the
at sign (@) in the host address.
$i - Instruction Instruction or command needed for the remote host to process a request.
$j - Bits per second Lowest and highest number of bits (binary units) of data that can be
transmitted per second when connected to a host. The syntax for recording the
number of bits per second (BPS) should be: <Lowest
BPS>-<Highest BPS>. If only lowest given: <Lowest
BPS>- ; If only highest given: -<Highest BPS>.
$k - Password Password required to access the electronic resource. An FTP site may require the
user to enter an Internet Protocol address or may require a specific password.
Electronically accessed catalogs may also require a password. If a system that
requires a password will accept anything entered as valid, this subfield can be
omitted from field 856. This subfield is used to record general-use passwords, and
should not contain passwords requiring security. Textual instructions about
passwords are contained in subfield $z (Public note).
$l - Logon 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 Name of a contact for assistance in accessing a resource at the host specified in
subfield $a. For addresses relating to the content of the resource
itself (i.e. the item represented by the title recorded in field 245) rather than
access assistance, field 270 is used. If the address data is the same, use field
270.
$n - Name of location of host Conventional name of the location of the host in subfield $a, including
its physical (geographic) location.
$o - Operating system For informational purposes, the operating system used by the host specified in
subfield $a may be indicated here. Conventions for the path and
filenames may be dependent on the operating system of the host. For the operating
system of the resource itself (i.e., the item represented by the title recorded in
field 245), rather than the operating system of the host making it available,
field 753 (Technical Details Access to Computer Files), subfield $c
(Operating system) is used.
$p - Port Portion of the address that identifies a process or service in the host.
$q - Electronic format type 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).
The intent of specifying this element is to provide information necessary to allow
people or machines to make decisions about the usability of the encoded data (what
hardware and software might be required to display or execute it, for example).
The electronic format type also determines the file transfer mode, or how data are
transferred through a network. (Usually, a text file can be transferred as
character data which generally restricts the text to characters in the ASCII
(American National Standard Code for Information Interchange (ANSI
X3.4)) character set (i.e., the basic Latin alphabet, digits 0-9, a few special
characters, and most punctuation marks) and text files with characters outside of
the ASCII set, or non-textual data (e.g., computer programs, image data) must be
transferred using another binary mode.)
$r - Settings Settings used for transferring data. Included in settings are: 1) Number Data Bits
(the number of bits per character); 2) Number Stop Bits (the number of bits to
signal the end of a byte); and 3) Parity (the parity checking technique used). The
syntax of these elements is:
<Parity>-<Number Data Bits>-<Number Stop
Bits>
If only the parity is given, the other elements of settings and their related
hyphens are omitted (i.e., <Parity>). If one of the other two
elements is given, the hyphen for the missing element is recorded in its proper
position (i.e., <Parity>--<Number Stop Bits> or
<Parity>-<Number Data Bits>- ). The values for parity
are: O (Odd), E (Even), N (None), S (Space), and M (Mark).
$s - File size Size of the file as stored under the filename indicated in subfield $f.
It is generally expressed in terms of 8-bit bytes (octets). It may be repeated in
cases where the filename is repeated and directly follows the subfield
$f to which it applies. This information is not given for journals,
since field 856 relates to the entire title, not to particular issues.
$t - Terminal emulation Whether terminal emulation is supported. Terminal emulation is usually specified
for remote login (first indicator contains value 2 (Remote login (Telnet)).
$u - Uniform Resource Identifier 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 Hours that access to an electronic resource is available at the location indicated
in this field. If the record is for a system or service, the hours of availability
are recorded in field 307 (Hours, etc.). This subfield is only used to record
hours of availability of the specific location indicated in field 856.
$w - Record control number System control number of the related record preceded by the MARC code, enclosed in
parentheses, for the agency to which the control number applies. The data in the
subfield links field 856 to the MARC record having the same data in a control
number field. See
Organization Code
Sources for a listing of organization code sources used in MARC 21 records.
$x - Nonpublic note Note relating to the electronic location of the source identified in the field.
The note is written in a form that is not adequate or intended for public display.
It may also contain processing information about the file at the location
specified.
$y - Link text 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.
Use of the link text is independent of any decision concerning the second
indicator value.
$z - Public note Note relating to the electronic location of the source identified in the field.
The note is written in a form that is adequate or intended for public display.
$3 - Materials specified Part of the bibliographic item to which the field applies.
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| 856 |
42$3Finding aid$uhttp://lcweb2.loc.gov/ammem/ead/jackson.sgm
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$8 - Field link and sequence number
■ EXAMPLES
856 with URL/URN:
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| 856 |
41$uhttp://www.jstor.org/journals/0277903x.html
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40$uhttp://www.cdc.gov/ncidod/EID/eid.htm$qtext/html
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41$uhttp://purl.oclc.org/OCLC/OLUC/34907403/1$xhttp://export.uswest.com/
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| 856 |
1#$uftp://harvarda.harvard.edu$kguest
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| 856 |
42$3Finding aid$uhttp://lcweb2.loc.gov/ammem/ead/jackson.sgm
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42$3French version$uhttp://www.cgiar.org/ifpri/reports/0297rpt/0297-fr.htm
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42$3Essays from annual reports$uhttp://woodrow.mpls.frb.fed.us/pubs/ar/index.html
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1#$uftp://wuarchive.wustl.edu/mirrors/info-mac/util/color-system-icons.hqx$s16874 bytes
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2#$utelnet://maine.maine.edu$nUniversity of Maine$t3270
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| 856 |
1#$uftp://wuarchive.wustl.edu/mirrors2/win3/games/atmoids.zip$cdecompress with PKUNZIP.exe$xcannot verify because of transfer
difficulty
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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
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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
text
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4#$uhttp://susdl.fcla.edu/cgi-bin/cgiwrap/~fdl/fdlcgi?FA00000011%2Fjpg$yElectronic resource (JPEG)
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| 856 |
4#$uhttp://susdl.fcla.edu/cgi-bin/cgiwrap/~fdl/fdlcgi?FA00000011%2Fpdf$yElectronic resource (PDF)
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856 without URL/URN:
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| 856 |
2#$aanthrax.micro.umn.edu$b128.101.95.23
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| 856 |
1#$amaine.maine.edu$cMust be decompressed with PKUNZIP$fresource.zip
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| 856 |
0#$akentvm.bitnet$facadlist file1$facadlist file2$facadlist file3
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| 856 |
0#$auicvm.bitnet$fAN2$hListserv
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| 856 |
2#$amadlab.sprl.umich.edu$nUniversity of Michigan Weather Underground$p3000
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| 856 |
10$zFTP access to PostScript version includes groups of
article files with .pdf extension$aftp.cdc.gov$d/pub/EIS/vol*no*/adobe$f*.pdf$lanonymous$qapplication/pdf
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INPUT CONVENTIONS
Embedded Holdings Information - When holdings information is embedded in a MARC bibliographic record, multiple
occurrences of field 856 may be used if the information does not include other holdings
information fields that must be linked to a specific field 856 for intelligibility.
Subfield $3 may be used to specify the parts of an item to which information
in field 856 applies.
Display Constants - Introductory terms or phrases such as
Electronic resource:,
Electronic
version:, etc. are not carried in the MARC record. They may be system generated
as display constants associated with the second indicator value.
| Second indicator |
Display constant |
| # |
Electronic resource: |
| 0 |
Electronic resource: |
| 1 |
Electronic version: |
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Related electronic resource: |
| 8 |
[no display constant generated] |
Spacing underscore and tilde in URLs - In February 1994, additional characters in the MARC character set were defined to both
accommodate existing bibliographic needs and to align it with the ASCII and ANSEL
character sets. Both the spacing underscore and the spacing tilde were added at the time
because of the need in directory and file names for electronic resources.
Many systems have implemented these characters, however, for systems that have not
implemented the spacing underscore and tilde, the following alternative characters may
be used:
| %5F for spacing underscore |
| %7E for spacing tilde |
Style for Recording Telephone, Numbers - In subfield $b, periods, spaces, and parentheses used to divide the portions
of a number are replaced with hyphens. Numbers are recorded as follows:
| <country code>-<area/city
code>-<exchange/line number>
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Exchange/line number portion often includes internal separators which are replaced by
hyphens. If an extension is also given, it is appended to the telephone number preceded
by a space and "
x".
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| 856 |
3#$b1-202-7072316$j2400/9600$nLibrary of Congress, Washington, DC$oUNIX$rE-7-1$tvt100$zRequires logon and password
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CONTENT DESIGNATOR HISTORY
$g - Electronic name - End of range [REDEFINED, 1997]
$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.
$q - File transfer mode [REDEFINED, 1997]
Subfield $q was defined to contain an indication of whether the file was
transferred as binary or ASCII. It was redefined to contain type of electronic
format.
$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.
$y - Link text [NEW, 2000]