[tw5] Setting the emptyValue in Set Widget

[Mohammad]

I have a small macro to sweep a list of tiddlers from first to last

Here parent is a tag name some tiddlers has been tagged with. *The 
following code works*
Here I have used two set widgets, one to set the emptyValue

\define nextItem(parent)
 <$set 
   filter='[tag[$parent$]first[]]'
   name=emptyTid
  >
 <$set
 filter='[tag[$parent$]after{!!temp}]'
 name=NewIndex
 emptyValue=<<emptyTid>>
 >
  <$action-setfield
   $tiddler={{!!title}}
   temp=<<NewIndex>>
   />
</$set>
</$set>
\end


<$button actions=<<nextItem "myTag">> >Next</$button>



But if I directly set the emptyValue and I have used only one set widget. *But 
it does not work!!*

\define nextItem(parent)
 <$set
 filter='[tag[$parent$]after{!!temp}]'
 name=NewIndex
 emptyValue='[tag[$parent$]first[]]'
 >
  <$action-setfield
   $tiddler={{!!title}}
   temp=<<NewIndex>>
   />
</$set>
\end


<$button actions=<<nextItem "myTag">> >Next</$button>

What is the problem? Why I have to use two set widegets?


/Mohammad

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