<unittype> Unit Type

<unittype> is a new element in EAD3 required in <physdescstructured> in tandem with <quantity> to specify the type of unit being quantified. It may be “boxes,” “linear feet,” etc.


  • @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.”
  • @encodinganalog – not required. May contain information to map this tag to a particular element in another schema.
  • @id – not required. Creates an ID for element. Can be used for linking.
  • @identifier – not required. A machine-readable unique identifier related to the content of the element. On access terms and other elements whose content is drawn from an authority file, the unique identifier for the term being used. If this attribute is used, @source should also be used to identify the authority file.
  • @lang – not required. Three-letter code that indicates the language in which the element’s contents were written. It should come from ISO 639-2b.
  • @rules – not required. The name of descriptive rules used to formulate the unit type.
  • @script – not required. Four-letter code that indicates the script in which the element’s contents were written. It should come from ISO 15924.
  • @source – not required. The source of any controlled vocabulary terms concerning the unit type.

Child Elements

<unittype> may contain text.


  <unittitle>Department Minutes</unittitle>
  <unitdatestructured unitdatetype="inclusive">
        <fromdate standarddate="1978">1978</fromdate>
        <todate standarddate="1982">1983</todate>
      <datesingle standarddate="1985">1985</datesingle>
        <fromdate standarddate="1987">1987</fromdate>
        <todate standarddate="2020">2020</todate>
  <physdescset parallel="false" coverage="whole">
    <physdescstructured coverage="part" physdescstructuredtype="carrier">
    <physdescstructured coverage="part" physdescstructuredtype="materialtype">
      <unittype>electronic files</unittype>

EAD3 Tag Library Entry

View the official tag library entry for <unittype>