Research challenges

• How do you scale to incorporate many databases?

  …you try to build data models automatically
  

• How do you integrate their data models, to allow querying across sources and agencies?

  …you take a large ontology, link the models into it automatically, and provide a query reformulator
  

• How do you incorporate additional information that is available from text sources?

  …you use language processing tools to extract it
  

• How do you handle footnotes in the databases?

  …you extract them from the tables automatically
  

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