Re: extending @Book?

[Jeff Kingston]

If you look in file bookf/include, you'll see that the outermost
definition is @BookLayout, and that @Book is within that.  So
you need either

    extend @BookLayout
    def ...

or (more probably)

    extend @BookLayout @Book
    def ...

The former places the definition inside @BookLayout alongside
@Book, the latter places it inside @Book.

When using extend, as in using inheritance in OO languages, you
make visible all the internal definitions of the one you are
extending.  So you need to be a bit careful with name clashes etc.

Jeff