Validating XML structure with PHP

Hi, I want to validate an XML structure using PHP. I thought of using PHP's DOM and XSD or DTD for validation. This does the job ok, except on invalid XML structure I get the same error code. What I want is to point exactly why the XML structure is invalid. I know there's also an error message that gives a bit more precision on the cause, but it's not something I can show the user. Is there another way to validate XML structure (that can give a precise error cause, like missing element, invalid element value, etc)? -thanks, Eli