Re: tree structure class

> The url that made me understand that: > > http://research.calacademy.org/taf/proceedings/ballew/index.htm thanks for the link, now i got it too :-) as i understand using the nested-set-model is very good for saving huge trees in the db, when you know the tree structure and when you want to work with chunks of the tree - how about dynamically inserting, moving and deleteing nodes? does everything need to be updated? sorry i am not too deep into this - yet my aims actually were - reading a tree from the db (xml file would be cool too) and "having" it in an array, to manipulate, walk, and use the tree - especially accessing every element from anywhere, finding my root, get my path and whatever ... - AND saving as little information as necessary in the db also for not needing to update so much when i change/insert something thats why i have to "build" the tree array after reading the data from the db - this i realized using an array which refers to its surrounding elements via [parent] [child] [next] [previous] [children] is the list of all direct children - it was definitely not thought to be a dynamic html-menu, if one wants to do that extending this class - fine, but that was not my intention - i just wanted to have a way to handle trees easily you can have a look at my stuff there "docuumentation" is best to read in the class-source header http://wolfram.kriesing.de/programming/index.php Wolfram