protected  void checkIfReferenceToGlobalTypeIsNeeded(Element elem,
    TypeSystemHolder typeSystemHolder,
    Inst2XsdOptions options) 
{
        // VenetianBlindDesign defines global complex types
        Type elemType = elem.getType();
        QName elemName = elem.getName();
        if (elemType.isGlobal())
            // is already global, do nothing
            return;
        if (elemType.isComplexType())
        {
            for (int i = 0; ; i++)
            {
                elemType.setName(new QName(elemName.getNamespaceURI(), elemName.getLocalPart() + "Type" + (i==0 ? "" : "" + i)));
                Type candidate = typeSystemHolder.getGlobalType(elemType.getName());
                if (candidate==null)
                {
                    elemType.setGlobal(true);
                    typeSystemHolder.addGlobalType(elemType);
                    break;
                }
                else
                {
                    if (compatibleTypes(candidate, elemType))
                    {
                        combineTypes(candidate, elemType, options);
                        elem.setType(candidate);
                        break;
                    }
                }
            }
        }
}