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Message: [QUOTE="Stefan Behnel, post: 3120534"] minidom creates a pretty complete tree data structure, with loads of backlinks to parent elements etc. That's where your circular references come from. I don't know why you want to use pickle here (and not serialised XML or the plain in-memory tree), but if memory consumption is an issue, try cElementTree, which comes with Python 2.5 (or as an external module for older versions). It's faster, more memory friendly and easier to use than minidom. There's also lxml.objectify, in case you can't live without pickeling. [URL]http://effbot.org/zone/celementtree.htm[/URL] [URL]http://codespeak.net/lxml[/URL] Stefan [/QUOTE]