Re: HTML+ and browser functionality

Tim Berners-Lee <>
Date: Wed, 30 Jun 93 17:11:40 +0200
From: Tim Berners-Lee <>
Message-id: <>
To: Dave_Raggett <>
Subject: Re: HTML+ and browser functionality
>p.s. Tim's spec seems to have the attribute named "REV" but "REL"  
> more appropriate. Any comments anyone?

The HTML spec has *both* REL and REV.   Both attributes can be lists
of relationships.  The occurence of a relationship in the REV  
(reverse) list indicates a relationship in th ereverse direction.
Otherwise, you have to have a convention for indicating logically
reverse relationships (eg is-child; has-child) or some
out of band system for knowing that

	A  is-parent-of	B

implies and is implied b by

	B  is-child-of	A

Is there any document where REV is present withouit REL?