Reply #46: have you been there? homes inside the city don't tend to have

[Hannah Bell]

"backyards" unless they belong to the wealthier classes - who tend not to keep pigs.

Xochimilco is outside the city proper, on the right side of highway 95 on this map view, outside the section of 95 circling the city.

http://maps.google.com/maps?f=q&source=s_q&output=html&q=Xochimilco,+Mexico+City,+Distrito+Federal,+Mexico&zoom=7


as i review your cites, they're all talking about the burbs of distrito federal, not the city proper, e.g.:

"The pig production in its rural area is based on small family backyard farms."