main.ss
#lang scheme
(require "schema.ss"
         "prop.ss"
         "query.ss"
         "tuple.ss"
         "relation.ss"
         "database.ss")
(provide (all-from-out "schema.ss"
                       "prop.ss"
                       "query.ss"
                       "tuple.ss"
                       "relation.ss"
                       "database.ss"))