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 SVGMarkerElement extends 
               SVGElement,
               SVGLangSpace,
               SVGExternalResourcesRequired,
               SVGStylable,
               SVGFitToViewBox {
  // Marker Unit Types
  public static final short SVG_MARKERUNITS_UNKNOWN        = 0;
  public static final short SVG_MARKERUNITS_USERSPACEONUSE = 1;
  public static final short SVG_MARKERUNITS_STROKEWIDTH    = 2;
  // Marker Orientation Types
  public static final short SVG_MARKER_ORIENT_UNKNOWN      = 0;
  public static final short SVG_MARKER_ORIENT_AUTO         = 1;
  public static final short SVG_MARKER_ORIENT_ANGLE        = 2;

  public SVGAnimatedLength      getRefX( );
  public SVGAnimatedLength      getRefY( );
  public SVGAnimatedEnumeration getMarkerUnits( );
  public SVGAnimatedLength      getMarkerWidth( );
  public SVGAnimatedLength      getMarkerHeight( );
  public SVGAnimatedEnumeration getOrientType( );
  public SVGAnimatedAngle      getOrientAngle( );

  public void setOrientToAuto (  );
  public void setOrientToAngle ( SVGAngle angle );
}