Hi Stef,
I mean, Tree structure is a standard Data Structure
including store, edit and visit. (endorder,preorder).
tree as a struture has a set of protocol for operations.
TreeStruture is a class of Dolphin ( it has become an
opensource project now ).
TreeStructure implements the <treeModel> protocol and
organises a collection of objects into a tree like data
structure.
You can organise the objects with TreeStructure when need
a tree. Only one class for all applications. I think.
But in Pharo , there is no such a standard tree structure.
so people makes theri owns.
e.g.
FTDataSource subclass: #FTTreeDataSource
MorphTreeModel subclass: #SpecTreeModel
Model subclass: #MorphTreeModel
Dictionary subclass: #KeyedTree (not real tree)
these implements mix tree structure and other attributes.
if we have a standard tree struture, so we can seperate
them, make the system become clean and simple.
Best Regards!
Liang