/**
* Constructs a new aggregate descriptor with the given category, e.g. "CONTENT".
*
* @param designation the descriptor type, e.g. "CONTENT"
* @throws BadDataException if the designation is invalid.
*/
public DescAggregate(String designation) throws BadDataException {
super();
idList = new TreeSet();
if (!Descriptor.isCategory(designation)) {
throw new BadDataException("Bad descriptor category -- " + designation);
} else {
setCategory(designation);
}
}
