One more idea about symbol library. I'm sure everyone here has seen Apple's iTunes. It has some nice features that could be borrowed
1) Each usr has a local copy of all the tracks 2) It is very easy to add to this local copy. 2.1) Can import from local file system 2.2) Can import from "standard" media like CD 2.3) can buy from online store 3) The local library is a linear (flat) unsorted list. It has no structure or order. However, for display it can be sorted on any of two dozen attributes while at the same time selection criteria can be applied 4) It is very easy to make custom subsets of the list. You can specify a subset by either selecting what to include or by giving some rules that act like live filters. Users can organize these subsets into folders and subfolders Very importent concept is that when a track is placed into one of these subsets it is there by refference only. So it can be placed into many different subsets. This is much more powerful than a simply hierarchical organization. Choosing a symbol is not exactly the same thing as choosing music but it's close enough that borrowing ideas from a popular music player might payoff.
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