Basically a wrapper is something that allows a (java) client to access to a source so a Wrapper can be described with a simple (Java) interface.

A wrapper is basically able to perform 2 tasks:

  1. the source introspection: this describes the source "schema" in a MOMIS way, using both ODLi3 and an XML description.
  2. the source querying: the wrapper (by the interface WrapperRS) enables a client to access data through a Result Set, that data resulting from a query are accessible as cursor on a table. Operation allowed are to get the numeber of selected columns, get value of a given column and move the cursor on the next row of the table.

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