6. A system comprising: a metamodel transformation engine that includes hardware and is to: receive a first metamodel conforming to a first meta-metamodel associated with first modeling unit types; and generate, 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; the metamodel transformation engine further to: after the generate the second metamodel based on the first metamodel and the mapping, use 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 use 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, use the tool developed using the second metamodel to access model data conforming to the first meta-metamodel.
6. A system comprising: a metamodel transformation engine that includes hardware and is to: receive a first metamodel conforming to a first meta-metamodel associated with first modeling unit types; and generate, 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; the metamodel transformation engine further to: after the generate the second metamodel based on the first metamodel and the mapping, use 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 use 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, use the tool developed using the second metamodel to access model data conforming to the first meta-metamodel. 8. The system according to claim 6 , wherein generation of the second metamodel comprises: generation, for each node of the first metamodel, of a respective class of the second metamodel.