author
A person who wrote (at least part of) the document.
keywords
A comma and/or space separated list of the keywords or keyphrases of the document.
The name (or names) of the copyright holder(s) for this document, and/or a complete statement of copyright.
date
The last updated date of the document, in ISO8601 date format.
identifier
The normative URI for the document.
rel
script
A reference to a client-side script. When used with the LINK element, the script is evaluated as the document loads and may modify the contents of the document dynamically.