private void expandRelatedAttributeUsesComponents(XSObjectList attrUses, Vector componentList,
            String namespace, Map<String, Vector> dependencies) {
        final int attrUseSize = (attrUses == null) ? 0 : attrUses.size();
        for (int i=0; i<attrUseSize; i++) {
            expandRelatedAttributeUseComponents((XSAttributeUse)attrUses.item(i), componentList, namespace, dependencies);
        }
    }