Section Refers to a document serving as a section in a collection of documents. Start Refers to the first document in a collection of documents. This link type tells search engines which document is considered by the author to be the starting point of the collection. Stylesheet Refers to an external style sheet. See the section on external style sheets for details.
Subsection Refers to a document serving as a subsection in a collection of documents.
This defines a reverse relationship. SRC The URL of the file that belongs to the link. The value supplied with the attribute must be the same as the name of the window, and is case-sensitive. If a window with the supplied target name does not exists then a new window will be created with that name. If you do not specify a target window the current window will be used, or the target specified with the BASE element.