@Override
    public int getSavableVersion(Class<? extends Savable> desiredClass) {
        if (classHierarchyVersions != null){
            return SavableClassUtil.getSavedSavableVersion(savable, desiredClass, classHierarchyVersions, importer.getFormatVersion());
        }else{
            return 0;
        }
    }
Part of the jME XML IO system as introduced in the Google Code jmexml project.

@author Kai Rabien (hevee) - original author of the code.google.com jmexml project
@author Doug Daniels (dougnukem) - adjustments for jME 2.0 and Java 1.5
@author blaine
jme3-plugins/src/xml/java/com/jme3/export/xml/DOMInputCapsule.java