There are several sites that can perform batch validation, such as the WDG HTML Validator , so that you can check multiple pages at once, but I believe that this is only for html. I do not know if there are similar validators for other languages. I will continue to watch what else I can find
I also found a link to using the w3c validator to check the batch. Here
EDIT *
You can also use something like Dreamweaver in xhtml format, but I find this doesn't work very well.
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