void attributeRenamed(AttributeMetaData amd,String oldName){
  attributeMetaData.remove(oldName);
  attributeMetaData.put(amd.getName(),amd);
}

void attributeRenamed ( AttributeMetaData amd , String oldName ) { attributeMetaData . remove ( oldName ) ; attributeMetaData . put ( amd . getName ( ) , amd ) ; }
this method must be called by attributes in order to inform the example set that they have been renamed . before calling this method , the amd already must have its new name .
