scheme Attributescheme AttributeThe scheme attribute may be used on the
meta element
to specify the metadata scheme used. This helps correct interpretation
of the content attribute.
For example, scheme="DD-MM-YY" may be used
to disambiguate a date specified by
content="06-01-08".
The possible values of the scheme attribute will depend
on (and should be specified in) the document's associated profile (as given by the
profile attribute of the
head element).