RELATIONSHIP LINK TAG: <LINK HREF="URL">

The link tag allows you to define relationships between the document containing the link tag and the document specified in the "URL". The following attributes are supported:
REL:
This attribute specifies the relationship between the HTML file and the Uniform Resource Locator (URL).
REV
The REV attribute (for "reverse") specifies the relationship between the URL and the HTML file.
For example:
<LINK REV="made" HREF="URL">
indicates that the file maker or owner is described in the document identified by the URL. (Note: that link tags are not displayed on the screen as part of the document. They define static relationships, not hypertext links).

The Link element indicates a relationship between the document and some other object. A document may have any number of Link elements. The Link element is empty (does not have a closing element), but takes the same attributes as the Anchor element. Typical uses are to indicate authorship, realted indexes and glossaries, older or more recent versions, etc. Links can indicate a static tree structure in which the document was authored by pointing to a "parent" and "next" and "previous" document, for example.

Servers may also allow links to be added by those who do not have the right to alter the body of a document.