<idno>

<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. 2.2.4 Publication, Distribution, etc. 2.2.5 The Series Statement 3.11.2.3 Imprint, Pagination, and Other Details
Module header — 2 The TEI Header
In addition to global attributes In addition to global attributes
type categorizes the identifier, for example as an ISBN, Social Security number, etc.
Status Optional
Datatype 

<rng:ref name="data.enumerated"/>
data.enumerated
Used by
altIdentifier biblStruct monogr msIdentifier seriesStmt model.nameLike model.publicationStmtPart
May contain Character data only
Declaration 

<rng:element name="idno">
 <rng:ref name="att.global.attributes"/>
 <rng:optional>
  <rng:attribute name="type">
   <rng:ref name="data.enumerated"/>
  </rng:attribute>
 </rng:optional>
 <rng:text/>
</rng:element>
element idno
{
   att.global.attributes,
   attribute type { data.enumerated }?,
   text
}
Example
<idno type="ISSN">0143-3385</idno>
<idno type="DOI">doi:10.1000/123</idno>
<idno type="URL">http://authority.nzetc.org/463/</idno>
<idno type="LT">Thomason Tract E.537(17)</idno>
<idno type="Wing">C695</idno>