For example:
- 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.
<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.