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 8601:1988, viz. yyyy-mm-dd.
Note

For the SGML 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 a restriction which SGML is not currently capable of enforcing.

The most prominent examples of this declared value type are the value attribute of the <date> element in the core tag set, and the date attribute of the <admin> element in the base tag set for terminology.

Filenameteiwsd2
Referenced by
Declaration<!ENTITY % ISO-date 'CDATA'>
See 3.8.3

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