Memory Leak with NSMutableString appendString?

If an end tag is missing, you will have a memory leak. It is better to have any allocations in parserDidStartDocument: and deallocations in parserDidEndDocument:, as these are guaranteed to be paired. And instead of allocating resultString in didStartElement, you just truncate it there.

I don't think you can know if appendString is using autorelease or not because the method changes it's object rather than returning a new object. In other words, because it's changing itself you're not responsible for it's memory management. You also don't own string so you don't have to release or autorelease it.

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