As described in HTML4 Meta data profiles.
HTML4 definition of the 'rel' attribute. Here is an additional value to indicate a link to an XMDP profile document. Please see the XMDP home page for more information about XMDP.
HTML4 definition of the 'class' attribute. This meta data profile defines a 'class' attribute value (class name) and its meaning as suggested by a draft of "Hypertext Links in HTML". All values are defined according to the semantics defined in the XMDP specification.
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