Paul Miller about the possible big data marketplaces evolution thanks to Google’s Public Data Explorer and Dataset Publishing Language (DSPL):
Matters become far more complex when you want to start combining different data sets, even within a single data marketplace. Typically, it’s not what these services are designed for, and typically, there is insufficient metadata to enable sensible combinations. […] Without knowledge of the units used, the newly combined data set is worthless — and, possibly, dangerously misleading.
Sir Tim-Berners Lee realized these issues long time ago and have been talking about linked open data star scheme.
Original title and link: Google Could Make Data Marketplaces Actually Useful (NoSQL databases © myNoSQL)