XHTML: <select> tag and numeric name attribute

[aragon]

Hi all,
is it legal to use a fully-numeric string as "name" attribute for the
<select> tag in the XHTML standard?

E.g.:

<form action="action.php" method="get">
<select name="12345">
<option value="1">test</option>
</select>
</form>

Is it okay to use "12345" as the name of the tag?

Is it valid also for all the other XHTML tags?

Thanks.