Safe to use this? - objective-c

I'm not that good in understanding apple documentation, but is it "Safe" to use this: http://www.touch-code-magazine.com/tutorial-building-advanced-rss-reader/
In a Xcode project, or will apple reject the app because it is customized?
I understand this might be a stupid question, but since Im not sure of the rules, I thought I ask first.
Also, what is the best way to release it?
Thank you in advance!
All the best,
Andy

Absolutely safe to use. I use GData in my project and Apple never rejected it.

You can use without any problem. And you can also use NSXLMParser.

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