19. The method of claim 13 , further comprising providing a language schema for integrating the multidimensional expressions and the data mining extensions; and wherein integrating the multidimensional expressions and the data mining extensions into input for data mining model creation comprises integrating the multidimensional expressions and the data mining extensions into input for data mining model creation in accordance with the provided language schema.
19. The method of claim 13 , further comprising providing a language schema for integrating the multidimensional expressions and the data mining extensions; and wherein integrating the multidimensional expressions and the data mining extensions into input for data mining model creation comprises integrating the multidimensional expressions and the data mining extensions into input for data mining model creation in accordance with the provided language schema. 22. The method as recited in claim 19 , wherein integrating the multidimensional expressions and the data mining extensions into input for data mining model creation in accordance with the provided language schema comprises integrating the multidimensional expressions and the data mining extensions by accepting a multidimensional extension that replaces an relational query with an integrated expression.