I did not debug completely your code, although getting a depth of 135 for an element leads me to believe there is a problem somewhere, and the fact that it does not stop at the end of the file is a problem too, but here are a couple of comments:

• you really need to have a look at the XML spec, and especially at the production rules (if you want to extract the rules Ways to Rome has plenty of code examples for this)
• spaces are allowed nearly everywhere in markup: between the opening < and the tag name for example,
• > is a perfectly valid character in an attribute value, so you cannot use it to spot the end of a tag,
• some of the features that you are not supporting: CDATA sections, entities, DTD...

My advice would be to do this "a-la-Xtreme Programming": write code that logs the parsing for one (or several) of the XML parsers (XML::Parser, XML::SAX::PurePerl, XML::Parser::Lite, XML::libXML) and then compare the output to what your code does, for small files, one file at a time. This will give you a reference and a goal for your parser.

When you feel pretty confident that your code works fine, then you can try it on the XML::Parser test suite and decide that after all you don't really need to write no stinkin' parser, as I did ;--(

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