Have a look at a thoughtful article on semantic integration, flagged from Wikipedia.
In a nutshell, this is a form of integration that focuses on data, and relies on ontologies (effectively metadata by domain, or data dictionaries) being published in a relatively standardised format.
The ultimate goal would surely be a product which sucks all a company’s metadata into one source – regardless of original format - then enables updating from that source. Now there’s a business opportunity.
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