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In order to facilitate data sharing and unambiguous interpretation of data between different data stewards and users, it is imperative to share a common vocabulary. When implemented in a data system, there are rules dictating what terms are available to be used, and what those terms mean. These rules comprise a controlled vocabulary. CUAHSI has a good exmaple of a controlled vocabulary system for environmental data. http://his.cuahsi.org/mastercvreg/cv11.aspx
ETL
Extract, Transform, Load. https://en.wikipedia.org/wiki/Extract,_transform,_load
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