A rel="" attribute is desirable for links, for example to
- limit the interest of comment spam with rel="nofollow" for anonymous wiki contributions (see Google)
- identify page tags with rel="tag" (see microformats)
- define a social network with rel="friend co-worker met ..." for contacts (see XFN)
- define a license with rel="license" (see microformats)
This patch adds this possibility to htmllink().
This one uses it for tags:
This can also help for css decoraton. An example of these patches in use: http://poivron.org/~nil/iki/japonesie/horizon_large/