It checks to see, for instance, that if a paragraph was started, that it was ended. It checks to make sure if you link to something in the document, that that something is actually there.
It can tell you when things are wrong, which is useful. But like most other validation tools, it often won't tell you usefully where the defect is. It will tell you where the number of paragraph starts don't equal the number of paragraph ends, but that is often at the end of the document.
It can also alert to what it thinks are problems, but which aren't really problems.
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