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The using of the XoopsTree class generates a lot of queries to the database.
Most modules are using it directly or by XoopsTopic
I have re-writen it to make only one query when it's intanciated.
I've preserved all the methods with the same return (checked)
The code is also shorter & faster than the original one.
If you want to have a look to the code:
http://www.moflus.com/modules/newbb/viewtopic.php?topic_id=15&post_id=58#forumpost58