Many MAGE objects can be further chracterized by attaching Descriptions to them, if there is some important information that cannot be recorded using provided attributes and relations. A Description can consist of a piece of free text, references to database entries, references to ontology entries (annotations) and one or more bibliographic references. A generic NameValueType class also is provided, objects of which can be attached to every MAGE object if even the Description functionality is not sufficient.