1. A method implemented by a computing system in response to execution of program code by a processor of the computing system, the method comprising: determining a first metamodel conforming to a first meta-metamodel supporting metamodel class inheritance at the first metamodel level; identifying one or more segments of an aggregation-free tree of nodes of the first metamodel; identifying a lowest-level node of one of the one or more segments; identifying all higher-level nodes of the one of the one or more segments; and consolidating attributes of each of the identified nodes of the one of the one or more segments into a node of a second metamodel conforming to a second meta-metamodel.