I've been bothered by the confusion around this for a long time, and finally sat down to write about it. The result, if anyone is interested, can be found at: <URL: http://www.garshol.priv.no/blog/7.html > -- Lars Marius Garshol, Ontopian <URL: http://www.ontopia.net > GSM: +47 98 21 55 50 <URL: http://www.garshol.priv.no >