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Well-defined data documents basis for transactions (checks, etc)
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Searches make sense at last (catalogs etc)
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Common model for mixing and joining predictable systems:
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distribution rights
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endorsement labels
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configuration files
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personal profiles
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privacy policies
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library classification
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payment method labels
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internet infrastructure monitoring
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compatability information
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experimental results
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syndication flow
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weather information
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financial instruments
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archive and mirror control
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style sheet association
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backlinks
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configuration control
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group membership
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address books
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...
Challenge: clean data model