preprint on groupoids and quantales

I have placed in the arXiv a preprint on (mostly etale) groupoids and quantales (59 pages) that contains material about which I talked last Spring in Coimbra, at CT04 in Vancouver, and recently in Cambridge. http://arXiv.org/abs/math/0412478 Best wishes, Pedro. 28-Dec-2004 23:30:26 -0400,1509;000000000000-00000000