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In the functions described above is it only possible to acces elements
which are visual. In this context visual does not mean
elements which can be seen, but rather elements in the
given tuple and above
Here are the rules for which elements are visible:
- All element which are not in any extentries are always visible
- Only one element in an extentry are visible at a time
- An extentry only has a visible element if one of its children
has been selected (including a child of an extentry inside of the
actual one etc.).
- It is possible to make all the element of an extentry visual one
at a time with the forevery function.
This gives the following rules, which you must always obey in the Change
function:
- From one tuple in an extentry you may not refer to another tuple
- You may never refer down into a sub extentry, but it's ok to
refer up.
Jesper Kjær Pedersen <blackie@imada.ou.dk>
Wed Oct 2 13:29:53 MET DST 1996