* Receives the value of the ODFDOM attribute representation <code>ChartClassAttribute</code> , See {@odf.attribute chart:class}
*
* @return - the <code>String</code> , the value or <code>null</code>, if the attribute is not set and no default value defined.
*/
public String getChartClassAttribute() {
ChartClassAttribute attr = (ChartClassAttribute) getOdfAttribute(OdfDocumentNamespace.CHART, "class");
if (attr != null) {
return String.valueOf(attr.getValue());
}
return ChartClassAttribute.DEFAULT_VALUE;
}