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Possible Duplicate:
What are valid values for the id attribute in HTML?
valid value for name attribute in html
It is valid to name a HTML5 input with a string containing a period?
<input type="text" name="article.title" value="The title"/>
Yes, it’s valid.
But you will make things difficult for yourself if you need to access them via JS or CSS in particular. Again, it can be done, but it will make things difficult.
My advice is to use a hyphen instead.