[Zope] ZPT idiom

Speaking of idiom: which do people feel is better: <input name="test" tal:attributes="value request/foo"> or <input name="test" value="dummy" tal:attributes="value request/foo"> That is, should the value= tag be given when it is going to be replaced by a tal? (Both forms work, I am concerned about readability and pedagogy.) What about <input type=checkbox name=test2 tal:attributes="checked request/foo | nothing"> vs. <input type=checkbox name=test2 checked tal:attributes="checked request/foo | nothing"> Again, both forms have been tested, does the latter form help or hinder readability? Jim Penny