| ## Text Encoding Initiative
### The XML Version of the TEI Guidelines # %ISO-date

`ISO-date` | as the declared value of an attribute, indicates that the attribute value should be a legal ISO date in the format defined by ISO 8601:2000(E) Data elements and interchange formats — Information interchange — Representation of dates and times, e.g. yyyy-mm-dd.
Note | For the parser, this entity has the same effect as specifying a declared value of ‘CDATA’. For the user and the application program, however, ‘%ISO-date;’ documents an additional restriction on the legal content for this element. The most prominent examples of this declared value type are the `value` attribute of the `<docDate>` element in the core tag set, and the `date` attribute of the `<admin>` element in the base tag set for terminology.
Declaration | `<!ENTITY % ISO-date 'CDATA' >`
See further | 3.8.3 Parameter Entities for TEI Keywords

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