* Sets the state of the "add default entities" flag.
     *
     * @param addDefaultEntities a addDefaultEntities object.
     */
    public void setAddDefaultEntities(boolean addDefaultEntities) {
        this.addDefaultEntities = addDefaultEntities;
    } // -- void setAddDefaultEntities( boolean )

    public static interface ContentTransformer {
        /**
         * Interpolate the value read from the xpp3 document