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;

public interface SVGLocatable {
  public SVGElement              getNearestViewportElement( );
  public SVGElement              getFarthestViewportElement( );

  public SVGRect   getBBox (  );
  public SVGMatrix getCTM (  );
  public SVGMatrix getScreenCTM (  );
  public SVGMatrix getTransformToElement ( SVGElement element )
                  throws SVGException;
}