http://www.w3.org/ns/prov#value | - Why do some people have beer while other people do not have it? (I think this is a bad example, but it is his so I will use it.) Well, it is either that some people want beer and other people don't, or there are some institutions that are pro-beer (Germany anyone?) and others that aren't, (You do not see many Yemeni Lagers or Iranian Pale Ales on the market.) or it could be that some places have grain,
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