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