* Attribute is mandatory.
*
* @return - the <code>String</code> , the value or <code>null</code>, if the attribute is not set and no default value defined.
*/
public String getPresentationSourceAttribute() {
PresentationSourceAttribute attr = (PresentationSourceAttribute) getOdfAttribute(OdfDocumentNamespace.PRESENTATION, "source");
if (attr != null) {
return String.valueOf(attr.getValue());
}
return null;
}