Caché Class Definition Reference
Specifies whether this projection definition is internal (not displayed in the class documentation). Note that the class documentation does not currently display projections at all.
To specify that this projection is internal, use the following syntax:
Projection projectionname As class [ Internal ];
Otherwise, omit this keyword or place the word Not
immediately before the keyword.
class members are not displayed in the class documentation. This keyword is useful if you want users to see a class but not see all its members.
Note that the class documentation does not currently display projections at all.
If you omit this keyword, the projection is not internal.