http://books.google.co.uk/books?id=Awu7KqVPM-EC&pg=PA110&lpg...

Second, geography (or 'space') may also be of fundamental importance in the expression and organization of this urban 'mixity'. As we have seen..


http://www.compas.ox.ac.uk/publications/Working papers/wp-05...

Backlash Against Diversity? Identity and Cultural Politics in European Cities

Yet the reality, in a globalised and transnational world, is that the city is a site of a fourth vision, of 'mixity', one that many people find deeply disturbing. The paper ends by asking what might be said about the governance of the plural, ethnically heterogeneous, city under conditions of globalisation and mass transnational migration, in the light of these cultural transformations.

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Note added at 2 hrs (2009-01-15 19:07:31 GMT)
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http://www.ucl.ac.uk/environment-institute/Publications/Data...

such as urban mixity, appropriate densities and integrating public transport ..... Urban mixity of uses should encourage walkable environments. The ...

If this refers to the mixing of cultures and the tendencies related to it, this is a popular term in U.S. English.

http://en.wikipedia.org/wiki/Melting_pot

The melting pot is an analogy for the way in which heterogenous societies become more homogeneous, in which the ingredients in the pot (people of different cultures, races and religions) are combined so as to develop a multi-ethnic society. The term, which originates from the United States, is often used to describe societies experiencing large scale immigration from many different countries.

is what it means to me. I don't know about the urbaine part because I'm not sure what it refers to - businesses, or people or whatever....!

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Note added at 4 hrs (2009-01-15 21:03:27 GMT)
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Mixité urbaine
Définition
Répartition équilibrée des différentes fonctions urbaines à l'intérieur d'une agglomération en tenant compte des facteurs sociaux et économiques (habitat social, habitat privé, activités économiques, commerces, équipements,…), par opposition à la spécialisation urbaine. L'objectif de mixité urbaine, poursuivi par la loi LOV (loi d'orientation pour la ville) a été réaffirmé et renforcé par la loi SRU (loi Solidarité et renouvellement urbains), notamment dans le domaine de la mixité sociale dans le logement.
http://www.muleta.org/muleta2/rechercheTerme.do?critere=&pay...

It certainly seems to be a lot broader than the population!