Some examples already discussed are ?Keyword and ?Text. ?Comment is another class with similar properties. Others system classes are used for table definitions (?Table and ?Table_definition), display colors (?Colour), display configuration (?View) and session control (?Session). The screen dump shows how these appear in a reinitialized database with an empty models.wrm.
The Keyset class by default is available from the main window. Keysets are simply lists of object names, as might be returned by a query or displayed in the main keyset window when a class is browsed. They can also be entered as data by the curator via ordinary text files, in which they are specified in a "class-object" format. A simple example is
KeySet "My favorite T-shirts" TShirt Sam22 TShirt Sam18 Tshirt Sam37
