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<unitid> ID of a Unit

<unitid> is an alpha-numeric text string that serves as a unique reference point or control number for descibed material. It is an important subelement of the <did>. While it may provide location information as a secondary function, it is primarily meant as a logical designation. Other <did> subelements such as <physloc> and <container> should be used to specifically designate the physical location. It is also not the same as the <eadid>, which is the unique identification string for the finding aid.


  • 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.
  • COUNTRYCODE – not required. The ISO 3166-1 code for the country in which the described materials are being held.
  • ENCODINGANALOG – not required. May contain information to map this tag to a particular element in another schema.
  • IDENTIFIER – not required. Machine-readable unique identifier containing a value similar to the text content of <unitid>.
  • 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.
  • REPOSITORYCODE – not required. The unique code used to indicate the repository which has physical control of the described materials. Should be taken from ISO/DIS 15511.
  • TYPE – not required. May be used to indicate the system from which the ID was derived.

The COUNTRYCODE and REPOSITORYCODE attributes are not required, but should be used at in the high-level <did> to comply with ISAD(G) 3.1.1.


<unitid> will likely PCDATA. It can also include the following generic subelements: <abbr>, <archref>, <bibref>, <emph>, <expan>, <extptr>, <lb />, <linkgrp>, <ptr>, <ref>, and <title>.


Use DACS 2.1.3, Local identifier for the value Use DACS 2.1.4, Repository identifier for the REPOSITORYCODE attribute. Use 2.1.5, Country identifier for the COUNTRYCODE attribute. Required. (DACS 2013, pp.14-15) Chapter 2.1 on the DACS site.

Our EAD file so far

Let’s put in a unitid. I’m going to use a REPOSITORYCODE to match the MAINAGENCYCODE in <eadid>.

		<eadid countrycode="us" mainagencycode="dgwl" url="http://www.eadiva.com/sample/">rkt-01</eadid>
				<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>
			<editionstmt><edition>1st ed.</edition>
			<p>Didn't need to specify since it's first edition, but wanted to use the fields.</p>
					<addressline>1600 Pennsylvania Ave</addressline>
					<addressline>Washington, DC, 20001</addressline>
					<addressline>Phone: 202-555-1234</addressline>
			<seriesstmt><p>Bell Family Papers</p>
					<p>The materials in this finding aid are based on an actual collection of Sarah J. Bell Kitchin's letters.</p>
					<p>This finding aid was created as a project for the EADiva.com website.</p>
			<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>.
			<descrules>This finding aid was prepared using Ruth's understanding of EAD and her use of the LOC EAD 2002 official website.</descrules>
				<date normal="20121204">December 4, 2012</date>
				<item>This finding aid was edited by Ruth Tillman in order to clarify contents in eadheader.</item>
		<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>
			<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>
	<archdesc level="collection">
			<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).
			<langmaterial label="Language">Correspondence in <language langcode="eng">English</language>.
			<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="height" unit="inches">12 in.</dimensions> paper.</extent>
			<physfacet type="writing">handwritten</physfacet>
			<physfacet type="writingstyle">cursive</physfact>
			<physloc label="Location" audience="external">Manuscripts</physloc>
			<physloc audience="internal">MS-511</physloc>
				<corpname>Official Name of Ruth's Repository</corpname>
				<subarea>Manuscript Division</subarea>
					<addressline>Main building of Ruth's repository</addressline>
					<addressline>Washington, DC, 20001</addressline>
					<addressline>Phone: 202-555-1234</addressline>
			<unitid countrycode="US" repositorycode="dgwl">sjb</unitid>

EAD tag library entry for <unitid>.