query ttk::treeview for all nodes?

Using Tcl 8.5.2 and tile 0.8.2:

I am trying to find the best way to query the tree for the all current
nodes in the tree so that I can easily delete everything in the tree.
I have played with keeping a list or an array around when I build the
tree to use that, but gets a little challenging when adding or
deleting a node or two from a large tree.

I have used the Bwidget tree in the past and could get all nodes (and
delete) by a command like:

-> $tree delete [ $tree nodes root ]

My guess is that the treeview builds nodes that are a sibling to the
root node and not a child?

Also, I do not see any index function to query for the index number of
the tree ($tree index 0). So, it seems like the only way I can get
all the nodes in the tree is knowing all the IDs of the nodes that
were inserted?

Thanks for any input.
.

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