@Override
public void write( final String value )
{
final XmlElement element = xml();
final HtmlContentSourceType type = property().element().property( HtmlPanelDef.PROP_CONTENT_SOURCE_TYPE ).service( MasterConversionService.class ).convert( value, HtmlContentSourceType.class );
if( value == null )
{
element.removeChildNode( PATH_URL );
element.removeChildNode( PATH_CONTENT );