1. A computer-implemented method comprising: receiving a first metamodel conforming to a first meta-metamodel associated with first modeling unit types; and generating, based on the first metamodel and on a mapping between the first meta-metamodel and a second meta-metamodel associated with second modeling unit types, a second metamodel conforming to the second meta-metamodel, wherein the first modeling unit types are different from the second modeling unit types; after the generating of the second metamodel based on the first metamodel and the mapping, using the second metamodel conforming to the second meta-metamodel to develop a tool that is based on the first metamodel conforming to the first meta-metamodel; and after the using of the second metamodel conforming to the second meta-metamodel to develop a tool that is based on the first metamodel conforming to the first meta-metamodel, using the tool developed using the second metamodel to access model data conforming to the first meta-metamodel.