UCM — there is no distinction between compositions and aggregations in the descriptions of classes

In the text that describes the meta-model classes, compositions and aggregations are not clearly identified: the reader must refer to the class diagrams. It would be better to have the information in the diagrams and in the text.

append "(owned)" to items that correspond to compositions

For the moment, the only way to distinguish between agregations and composititions is to have a look at the class diagrams: the text itself does provide information.
Append "(owned)" to items that correspond to compositions to help make the distinction between agregations and compositions.