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<extent> Extent

<extent> is a subelement of <physdesc> used to encode information about the quantity of materials described or an expression of the physical space they occupy. It can include cubic or linear feet, counts of special formats (photographs, letters, etc.), volume of a data file, etc. It may be repeated with the UNIT or TYPE attributes being used to specify the difference between element instances.

Note, this does not replace the <dimensions> element, which is used to specify the size of the actual materials.

Attributes

  • ALTRENDER – not required. Use if the content of the element should be displayed or printed differently than the rendering established in a style sheet for other occurrences of the element.
  • AUDIENCE – not required. Use to set whether the element’s contents will be visible to external users or to internal ones. Possible values are: “internal” and “external.”
  • ID – not required. Creates an ID for element. Can be used for linking.
  • ENCODINGANALOG – not required. May contain information to map this tag to a particular element in another schema.
  • LABEL – not required. This can be used when a meaningful display label for an element can’t be derived by the stylesheet from its name. It is available in all <did> subelements.
  • TYPE – not required. Any information which can clarify the type of extent measurement being given.
  • UNIT – not required. Any unit of measurement, used to clarify which unit is being used to describe the materials’ extent–feet, meters, cubic meters, etc..

Subelements

<extent> will likely contain PCDATA. It may include itself in a nested form. It may also include the following generic elements:<abbr>, <archref>, <bibref>, <emph>, <expan>, <extptr>, <extref>, <lb />, <linkgrp>, <ptr>, <ref>, and <title>.

DACS

See DACS Section 2.5, Extent. (DACS 2013, pp.28-30)

Our EAD file so far

I’ve used the TYPE attribute to distinguish three different kinds of <extent> in the file. These could be specified in a repository’s guidelines.

<ead>
	<eadheader>
		<eadid countrycode="us" mainagencycode="dgwl" url="http://www.eadiva.com/sample/">rkt-01</eadid>
		<filedesc>
			<titlestmt>
				<titleproper>Inventory of Something Useful for Learning EAD <date>2012-2013</date></titleproper>
				<subtitle>A totally awesome finding aid with a subtitle too</subtitle>
				<author>Ruth K. Tillman, the EADiva</author>
				<sponsor>Encoding thanks to EADiva's donation of her spare time.</sponsor>
			</titlestmt>
			<editionstmt><edition>1st ed.</edition>
			<p>Didn't need to specify since it's first edition, but wanted to use the fields.</p>
			</editionstmt>
			<publicationstmt>
				<date>2012</date>
				<publisher>EADiva.com</publisher>
				<address>
					<addressline>1600 Pennsylvania Ave</addressline>
					<addressline>Washington, DC, 20001</addressline>
					<addressline>Phone: 202-555-1234</addressline>
				</address>
			</publicationstmt>
			<seriesstmt><p>Bell Family Papers</p>
			</seriesstmt>
			<notestmt>
				<note>
					<p>The materials in this finding aid are based on an actual collection of Sarah J. Bell Kitchin's letters.</p>
				</note>
				<note>
					<p>This finding aid was created as a project for the EADiva.com website.</p>
				</note>
			</notestmt>
		</filedesc>
		<profiledesc>
			<creation>This finding aid was encoded by Ruth K. Tillman, on <date normal="20121118">November 18th, 2012</date>, using Notepad++. Material was generated off the top of her head.</creation>
			<langusage>This finding aid is written in <language langcode="eng">English</language>.
			</langusage>
			<descrules>This finding aid was prepared using Ruth's understanding of EAD and her use of the LOC EAD 2002 official website.</descrules>
		</profiledesc>
		<revisiondesc>
			<change>
				<date normal="20121204">December 4, 2012</date>
				<item>This finding aid was edited by Ruth Tillman in order to clarify contents in eadheader.</item>
			</change>
		</revisiondesc>
	</eadheader>
	<frontmatter>
		<div><head>Preface</head>
		<p>This inventory was prepared as part of the EADiva website to demonstrate EAD encoding of finding aids. It encodes information about the collection of the papers of Sarah Bell Kitchin as well as made-up information used to make the finding aid use more example elements. Like this one.</p></div>
		<titlepage>
			<titleproper>Inventory of Something Useful for Learning EAD <date>2012-2013</date></titleproper>
			<subtitle>A totally awesome finding aid with a subtitle too</subtitle>
			<author>Ruth K. Tillman, the EADiva</author>
			<publisher>EADiva.com</publisher>
		</titlepage>
	</frontmatter>
	<archdesc level="collection">
		<did><head>Overview</head>
			<abstract label="Abstract">Sarah J. Bell Kitchin, a Peace Corps Volunteer and professor of linguistics at the University of British Columbia. Her letters home from the Philippines (1967-1969) and Russia. Letters from members of the Bell family (1967-2000).
			</abstract>
			<langmaterial label="Language">Correspondence in <language langcode="eng">English</language>.
			</langmaterial>
			<physdesc label="Extent"><extent type="shelf" unit="feet">0.25 linear feet</extent>
			<extent type="box">(1 oversize box)</extent>;
			<extent type="contents">52 letters<extent> written on oversized <dimensions type="width" unit="inches">9 in.</dimensions> x <dimensions type="width" unit="inches">12 in.</dimensions> paper.</physdesc>
		</did>
	</archdesc>
</ead>

EAD tag library entry for <extent>.