MARC tags for electronic resources (Web Pages) with corresponding AACR2 rules

Fixed fields—Use the fixed fields for monographs (type a) or serials (type s), depending on the nature of the resource. For most Web sites, use date type “m” (multiple), with an open date to reflect the fact that the resource is subject to updating. Add an 006 secondary fixed field to reflect the “electronic resource” nature of the title and an 007 for the physical characteristics such as sound, color, etc.

006 Type m = Electronic resource
Audn = Intended audience (blank = not specified)
File = File type (d=document; j=online system or service; m=combination)
Gpub = Government publication (f for federal, s for state, etc.)

007 Physical description fixed field
$a category = c, computer file
$b specific material designation= r, remote resource
$d color (most Web pages will be m, multicolor)
$e dimensions (for Web pages use n, N/A)
$f sound (blank=no sound, a=sound)
$g image bit depth (u=unknown)
$h file format (a=one format, m=multiples, u=unknown)
$i quality assurance targets (u=unknown)
$j antecedent/source (u=unknown)
$k level of compression (a=uncompressed, u=unknown)
$l reformatting quality (a=access, n=N/A, p=preservation, r=replacement, u=unknown)

043 Geographic area code, if applicable. See links to MARC code lists at

Sources of Information. Usually the main source of information will be the title screen; however, according to the 2002 revision of AACR2 Chapter 9, the entire resource serves as the chief source of information for an electronic resource. This means it will not be necessary to bracket information that appears in locations other than the title screen. In addition to the home page screen, look carefully at other pages and at the document’s HTML source page to see if there is additional information you need to add to the record. Relevant information can appear anywhere on a Web site. (9.0B1-2)

1xx Author. Many Web sites will not have a known author. If the resource is the official site for a corporate body or government agency, consider it to be the author. (21.4B1) Personal creators of Web sites should not be given as authors in a 100 field unless the site being cataloged is that person’s own site. (21.1A1—variation) Example:

Web site being cataloged: Mississippi Dept. of Vital Statistics home page

Author of site content listed in document source: Sheryl Smith

Main entry:

110 1 Mississippi. $b Dept. of Vital Statistics.

245 10 Mississippi Department of Vital Statistics $h [electronic resource] / $c [Sheryl Smith].

Added entry:

700 1 Smith, Sheryl.

245 Title proper. (9.1C1)

Usually the title will be taken from the home page screen. Add the general material designation (GMD) “electronic resource” in 245 $h, immediately after the title proper. Transcribe statements of responsibility as indicated in 1.1F. Rule 9.1F2 instructs catalogers to add a word or short phrase to the statement of responsibility if the relationship between the title and the name in the statement of responsibility is not clear, e.g.

245 00 Mississippi statistical summaries $h [electronic resource] / $c [maintained by] David Reynolds.

246 Variant title. (9.7B4)

Examine the document source to see if there is an alternative title that needs to be entered in a 246 field. You may also add a 246 for a title that does not actually appear on the site but which patrons may be likely to look under, such as a phrase containing a widely used corporate acronym.

245 10 Mississippi Department of Transportation $h [electronic resource].
246 3 MDOT home page

256 Type of resource. (9.3B1)

AACR2 allows three descriptions: Electronic data, Electronic programs, and Electronic data and programs. Web sites consisting primarily of text should be designated Electronic data. Sites that have an interactive component such as a search engine are designated Electronic data and programs. Give extent of resource in parentheses if available (number of files, records, bytes, etc.)

256 Electronic data (1 file : 13 megabytes)

260 Publication information.

Rule 9.4B2 says to consider all remote access electronic resources to be published. The publication information is usually taken from the contact information at the bottom of the home page, where the corporate body gives its physical address. Web pages authored by individuals may not have publication information. If a date is given (e.g. “c2001”), give as an open date in 260 $c (i.e., c2001- ) (variation on 9.4F1). In case of multiple copyright dates which apply to various aspects of the resource, use only the latest copyright date (9.4F4).

270 Contact address. (not a USMARC field—adopted by OCLC)

Most corporate Web sites include a contact address at the bottom of the home page. If you are using OCLC, give this address in a 270 field in the form:

270 $i Contact address: $a

300 Physical description.

Do not use for Web pages; electronic resources are considered non-physical objects. (9.5, footnote). Some libraries’ local practice requires giving information such as “1 Web site” or “1 Web resource” in the 300 field.

516 Nature and scope of the resource. (9.7B1a)

For Web pages, use the phrase “World Wide Web resource.” Information currently entered in the 256 field may eventually be included in the 516.

538 System requirements. (9.7B1b)

The type of hardware and software needed to access the resource. Include mention of any programs needed to access specific files on the site.

538 System requirements: World Wide Web browser with Internet connectivity; Adobe Acrobat Reader required for abstracts and full text.

538 Mode of access. (9.7B1c)

Add another 538 field to indicate mode of access.)

538 Mode of access: World Wide Web.

546 Language and script. (9.7B2)

546 In German and English. (Note: multilingual works or translations also require use of the 041 field, with MARC language codes.) Programming languages, if applicable, should be recorded as part of the system requirements note.

500 General note: source of title proper. (9.7B3)

Always give the source of the title proper. For Web pages, also give the date the resource was viewed (9.7B22). These can be combined into a single note.

500 Title from home page screen, viewed Feb. 19, 2003.

500 General note: title variations. (9.7B4)

Many title variations can be expressed through the 246 field; give others in a 500 note.

246 1 $i Title from document source: $a MLA home page
246 1 $i Parallel title in HTML header: $a Ressources minérales du Canada

but for a title that does not apply to the resource you are cataloging:

500 Companion site: Butterflies of the United States.

500 General note: physical description. (9.7B10)

Give information about physical details that may affect use of the item.

500 Includes sound clips for selected text.

521 Audience. (9.7B14)

Make a note of the intended audience if the information is stated in the resource.

521 For use by qualified medical practitioners only.

530 Other formats. (9.7B16)

Use if the content has been issued in another format (e.g., print or microform).

520 Summary. (9.7B17)

Give a brief summary that indicates the nature of the site and its contents.

520 Features the Mississippi Dept. of Mental Health. Site includes statement of  philosophy, list of state mental health facilities, and links to other mental health resources.

505 Contents. (9.7B18)

List the parts of a resource. Optional for Web pages, since section headers can change frequently.

505 0 K-12 requirements – Reading readiness – Remedial courses.

506 Restrictions on access. (9.7B20)

Use to indicate any restrictions on accessing the site.

506 Registration and password required to access search engine.

6xx Subject headings.

Include topical headings; corporate or personal headings if the site is about a corporate entity or a person; and, if desired, a genre heading (655) for Computer network resources.

7xx Corporate/personal author added entries.

Give as needed. Remember to check source document for personal or corporate contributors
to the site.

856 URL.

For Web sites, the first indicator will be “4,” indicating an http address, and the second will be “0,” indicating that you are cataloging the resource itself (not a related resource or a reproduction).

856 40 $u

For complete listing of MARC tags, see OCLC Bibliographic Formats and Standards online at

Bib Services AcquisitionsCatalogingAuthority Control Serials