To demonstrate the facilities of the CrossNamespaceCopier I’ve created a small meta model…

As you see the Class2 from the “http://source.namespace” has been eliminated in the “http://target.namespace” and both attributes have been moved – attribute2 to Class1 and attribute3 to Class3. In order to migrate a model instance one has to call the CrossNamespaceCopier which copies the objects while migrating the name spaces according to rules previously set. OtherClass objects from the “http://other.namespace” will be copied as they are. All references and attributes which could not be automatically migrated need to copied in a small script manually.

extension CrossNamespaceCopier;

namespace::target::Class1 migrate(namespace::source::Class1 sc1)
:   let tc1 =
    // initialization for the copier, but the
    // let statement needs to be in the beginning
    (   crossNsInitStaticInstance()
    ->  crossNsSetupNamespaceMapping(
            "http://source.namespace",
            "http://target.namespace")
    // the content for the tc1 variable
    ->  (   (namespace::target::Class1)
            crossNsCopy(sc1)))
    // skipping Class2 in source
:   tc1.setClass3Reference(
            (namespace::target::Class3)
            sc1.class2Reference.class3Reference
            .crossNsCopy())
    // pull up attribute2
->  tc1.setAttribute2(
            sc1.class2Reference.attribute2)
    // pull down attribute3
->  tc1.class3Reference.setAttribute3(
            sc1.class2Reference.attribute3)
    // uninitializing
->  crossNsReleaseStaticInstance()
->  tc1
;

You will find the CrossNamespaceCopier as well as the demo files contained in a zip file.