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6.5. The link datatype

The rel and rev attributes, used in the link and a elements, describe the relationship between two resources (such as web pages and stylesheets).

Here is a list of the recognized link types. When used as a rel attribute, each link type defines the relationship between the current document, denoted as C, and some referenced resource, denoted as R. (The rev attribute defines the same relationship but in reverse order; in that case, C is the referenced document, while R is the current document.)

stylesheet R is a stylesheet to be used in rendering C. This is probably the most common use of the link element. Here's an example. Suppose you have a CSS stylesheet named gothic.css. To apply that stylesheet to the current document, you would use this element:
<link rel='stylesheet' href='gothic.css' type='text/css'/>
alternate R is another version of C, perhaps in a different language, or set up for a different media type.
appendix R is an appendix of C.
contents R is the table of contents for the set of documents that contains C.
copyright R is the copyright statement for C.
glossary R contains definitions of terms used in C.
help R is a document providing help for users of C.
index R is the index for the set of documents containing C.
next R is the next document in sequence after C.
prev R is the preceding document in sequence before C.
section R is a section of the document starting at C.
start R is the first in a series of documents that includes C.
subsection R is a subsection of document C.