int index = name.indexOf(":");

    int index = name.indexOf(":"); //$NON-NLS-1$

    if (index == -1)

    String nsPrefix  = null;

      return null;

    if (index != -1)

    else if (getEnclosingDefinition() != null)

    {

      return getEnclosingDefinition().getNamespace(name.substring(0, index));

      nsPrefix = name.substring(0, index);

    }

      return null;

    {

      nsPrefix = "xmlns"; //$NON-NLS-1$

    }

    String namespaceURI = null;

    // First try to locate the namespace URI in the definition's prefix to namespace map.

    // This will provide backward compatibility for existing clients.

    Definition enclosingDefinition = getEnclosingDefinition();

    if (enclosingDefinition != null)

    {

      namespaceURI = enclosingDefinition.getNamespace(nsPrefix);

    }

    // We did not find it at the top level, try to find a locally defined namespace prefix.

    if (namespaceURI == null)

    {

      namespaceURI = getNamespaceURIFromPrefix(element, nsPrefix);

    }

    return namespaceURI;