Convert XML name to unicode string.

def fromXMLname(string):
    """Convert XML name to unicode string."""

    retval = sub(r'_xFFFF_','', string )

    def fun( matchobj ):
        return _fromUnicodeHex( matchobj.group(0) )

    retval = sub(r'_x[0-9A-Za-z]+_', fun, retval )
        
    return retval