Catalog
Creating a catalog is
useful when your subject could be divided into small pieces.
There are 2
situations for a catalog : opened (a) and closed ( b)
You need to
recognized these situations ( fig. 1 )
For situation (a) you
can say that node is expanded.
For situation (b) you
can say that node is collapsed.
A node without
children ( an item ) cannot be expanded or collapsed.
Fig. 1 - Different views for
a catalog ( opened or closed )

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