http://xml.apache.org/commons/components/external/: xml-commons provides an Apache-hosted set of DOM, SAX, and JAXP interfaces for use in other xml-based projects. Our hope is that we can standardize on both a common version and packaging scheme for these critical XML standards interfaces to make the lives of both our developers and users easier. The External Components portion of xml-commons contains interfaces that are defined by external standards organizations. For DOM, that's the W3C; for SAX it's David Megginson and sax.sourceforge.net; for JAXP it's Sun. 

package org.w3c.dom.svg;

import org.w3c.dom.DOMException;

public interface SVGLengthList {
  public int getNumberOfItems( );

  public void   clear (  )
                  throws DOMException;
  public SVGLength initialize ( SVGLength newItem )
                  throws DOMException, SVGException;
  public SVGLength getItem ( int index )
                  throws DOMException;
  public SVGLength insertItemBefore ( SVGLength newItem, int index )
                  throws DOMException, SVGException;
  public SVGLength replaceItem ( SVGLength newItem, int index )
                  throws DOMException, SVGException;
  public SVGLength removeItem ( int index )
                  throws DOMException;
  public SVGLength appendItem ( SVGLength newItem )
                  throws DOMException, SVGException;
}