Hi, does a validator exist for Priority 1 W3C web content accessibility guidelines? Such as the validator for XHTML on W3C?

I am unsure of your question.
If your looking for a software that makes W3C web content then the nearest web builder you can get is a software which is the best web builder on the planet. Its called WYSIWYG Web Builder.
Most of the pre-coding is W3C and its an easy drag and drop web builder without the need to use invisable forms!
Trust me, I love it and you can also advance code in it too!
Its GREAT!

http://www.wysiwygwebbuilder.com/