Accessing Data Sources

• Define the mediator extents

  extent person0 of Person wrapper w0 extent p0;
  
  extent person1 of Person wrapper w1 extent s1
  map (name = sname);
  

• Can use subtyping and views to define more complex transformations on the data sources.

  define double as
  
  select struct (name: x.name, salary: x.salary+y.salary)
  from x in person0 and y in person1
  where x.name = y.name

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