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.
Internal 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.
“Projection Definitions” in this book
“Defining Class Projections” in Using Caché Objects
“Introduction to Compiler Keywords” in Using Caché Objects