Traversing XML structures

[community_help]

This question was posted in response to the following article: http://help.adobe.com/en_US/as3/dev/WS5b3ccc516d4fbf351e63e3d118a9b90204-7e6b.html

[towertop_cn]

I advice to talk some about the runtime error while traversing XML object.

When and what kind of exceptions will it throws? Are them catchable?

I think programmer would like to protect the traversing logic from undecided XML input.