Define structure of the data returned by parsers:
  o Producers need to know what to expect
  o For testing purposes, we need to know if parsers are returning
    something reasonable

Modules to be written/finished
    SQL::Translator::Validator
    SQL::Translator::Parser::xSV
    SQL::Translator::Producer::MySQL
    SQL::Translator::Parser::Excel

Should the parsers return an instance instead of a data structure?  It
would make traversing the data structure easier.


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