<idno> (identifier) supplies any form of identifier used to identify some object, such as a bibliographic item, a person, a title, an organization, etc. in a standardized way. [13.3.1. Basic Principles 2.2.4. Publication, Distribution, Licensing, etc. 2.2.5. The Series Statement Imprint, Size of a Document, and Reprint Information]
typecategorizes the identifier, for example as an ISBN, Social Security number, etc.
Derived fromatt.typed
Status Optional
Datatype teidata.enumerated
Suggested values include:
International Standard Book Number: a 13- or (if assigned prior to 2007) 10-digit identifying number assigned by the publishing industry to a published book or similar item, registered with the International ISBN Agency.
International Standard Serial Number: an eight-digit number to uniquely identify a serial publication.
Digital Object Identifier: a unique string of letters and numbers assigned to an electronic document.
Uniform Resource Identifier: a string of characters to uniquely identify a resource, following the syntax of RFC 3986.
A data number in the Virtual Internet Authority File assigned to link different names in catalogs around the world for the same entity.
English Short-Title Catalogue number: an identifying number assigned to a document in English printed in the British Isles or North America before 1801.
OCLC control number (record number) for the union catalog record in WorldCat, a union catalog for member libraries in the Online Computer Library Center global cooperative.
calendarindicates one or more systems or calendars to which the date represented by the content of this element belongs.
Deprecatedwill be removed on 2024-11-11
Status Optional
Datatype 1–∞ occurrences of teidata.pointer separated by whitespace

<sch:rule context="tei:*[@calendar]">
<sch:assert test="string-length( normalize-space(.) ) gt 0"> @calendar indicates one or more
systems or calendars to which the date represented by the content of this element belongs,
but this <sch:name/> element has no textual content.</sch:assert>
Member of
Contained by
May contain
gaiji: g
header: idno
character data

idno should be used for labels which identify an object or concept in a formal cataloguing system such as a database or an RDF store, or in a distributed system such as the World Wide Web. Some suggested values for type on idno are ISBN, ISSN, DOI, and URI.

<idno type="ISBN">978-1-906964-22-1</idno>
<idno type="ISSN">0143-3385</idno>
<idno type="DOI">10.1000/123</idno>
<idno type="URI">http://www.worldcat.org/oclc/185922478</idno>
<idno type="URI">http://authority.nzetc.org/463/</idno>
<idno type="LT">Thomason Tract E.537(17)</idno>
<idno type="Wing">C695</idno>
<idno type="oldCat">
 <g ref="#sym"/>345

In the last case, the identifier includes a non-Unicode character which is defined elsewhere by means of a glyph or <char> element referenced here as #sym.

Content model
 <alternate minOccurs="0"

  <classRef key="model.gLike"/>
  <elementRef key="idno"/>
Schema Declaration
element idno
   attribute type
    | "ISSN"
    | "DOI"
    | "URI"
    | "VIAF"
    | "ESTC"
    | "OCLC"
    | teidata.enumerated
   attribute calendar { list { teidata.pointer+ } }?,
   ( text | tei_model.gLike | tei_idno )*