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    <p>Reading XML looks simple but doing it correctly involves a few complexities you don't really want to deal with. Indeed, writing a simple XML parser effectively amounts to creating yet another XML library. I have done it and an incomplete version of this is sitting somewhere on my disk. Even if you don't need to validate your XML structure:</p> <ul> <li>whether you validate or not, you need to deal with entity references like <code>&amp;lt;</code> and the variety of character entity references like <code>&amp;#65;</code> and <code>&amp;#xa;</code></li> <li>the plain body of an XML document is relatively simple but the header a major pain to deal with in particular the DTD: there are two versions thereof which are slightly different and you probably need to process the inline DTD</li> <li>even the body isn't entirely trivial because of these annoying character data segments</li> <li>even without validation you may need to support external entity references</li> <li>the characters to be accepted and/or rejected for various parts of XML are also somewhat interesting</li> <li>note that XML is defined in terms of Unicode and proper handling of this isn't entirely trivial either: just using <code>char</code> or <code>wchar_t</code> just doesn't cut it.</li> </ul> <p>The first version I implemented was a nice little iterator intended to pop out all the elements encountered. This allowed for the nice feature of easily stopping and continuing the parsing at the choice of the iterator user. Unfortunately, I didn't get it to fly when trying to copy with the various entity references. It would parse simple XML files nice and fast but some quirks in the specification I just didn't get right.</p> <p>What worked best for me was creating a simple recursive decent parser combined with a suitable stack of buffers to somewhat transparently deal with entity references. However, to finish this completely I still need to deal with some encoding issues and in the end I just had higher priority projects to work on (in my spare time, that is).</p> <p>In summary: it can be done, obviously, as others did. It is probably a somewhat pointless exercise unless you have a really bright idea which makes your implementation uniquely better suited than the alternatives.</p>
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    1. POParse an XML in standard C/C++ without additional libraries
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    1. USDietmar Kühl
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    1. COThanks for answer! I think i'm going for the iterator, i don't want to get somewhat complicated with recursivity, buffers and so on.
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      1. USAndrei
 

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