Tree view type applet question

[talisman]

hi,

before i consider writing one, i thought i'd ask if anyone is aware of
an already commercially available applet that -


(a) provides a tree view of a data format - the applets data file
format should be xml.

(b) has a drag n drop functionality (so yo ucan drag leaf from one
node to another folder etc).

(c) exposes methods for getting current state of tree in xml.

(d) can set different icons in xml data file for tree nodes etc.

(e) has a generally rich set of methods for adding folders, leaf nodes
etc to the structure, deleting them, getting id of the current
selected node etc.

(f) the applets xml datafile should be able to store id's relating to
nodes etc...


thanks