Parse xml file line by line and modify lines

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Here's the job.

Parse an xml file which contains a program tv guide (xmltv format).Here is a sample but the real file is 25Mb.
Create a new xml file with :

- only the channels desired (up to 30 channels) : function keepchannel([url removed, login to view], [url removed, login to view], ...) ;

- new GMT time : function changeTime(channel, oldtime, newtime), exemple changeTime([url removed, login to view],+0100,-1000);

- new channel name, function changeChannelName(oldname, newname); -> modify the value of tag <display-name>

- new channel id, function changeChannelID(oldname, newname);

That's all.

The program must be written in objective c.
I need the source code with comments.
Watch UTF8, I need the accents.
I don't need any dialog box, I'll just modify the source myself

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