DD><CODE>href</CODE> - An href attribute, which may be relative or absolute.<DD><CODE>base</CODE> - The base URI against which the first argument will be made
            absolute if the absolute URI is required.
<DT><B>Returns:</B><DD>A <CODE>Source</CODE> object, or null if the href
         cannot be resolved.
<DT><B>Throws:</B>
<DD><CODE>javax.xml.transform.TransformerException</CODE> - Never thrown by this implementation.<DT><B>See Also:</B><DD><CODE>URIResolver.resolve(String, String)</CODE></DL>
</DD