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