checkPluginVersions(lineage, request, problems);

        // inheritance assembly
        Model resultModel = assembleInheritance(lineage, request, problems);

        // consider caching inherited model

        problems.setSource(resultModel);
        problems.setRootModel(resultModel);

        // model interpolation
        resultModel = interpolateModel(resultModel, request, problems);

                            "build.plugins.plugin.version", problems, p.getVersion(), p.getKey(), p, request);

                    validateBoolean(
                            "build.plugins.plugin.inherited",
                            EMPTY,
                            problems,
                            errOn30,
                            Version.V20,
                            p.getInherited(),