[Zope] Simple assignment (?)

[Bruce Eckel]

I'm trying to do an assignment to a variable I created with
"let" as follows:

<dtml-let pricelist="parseSeminarRegistration(price_dates)"
  currentPrice="pricelist[0][1]" >

<dtml-in pricelist>
  <dtml-if sequence-key>
    <dtml-if "_.DateTime() <
_.DateTime(_['sequence-key'])">
      <dtml-call currentPrice="_['sequence-item']">
    </dtml-if>
  </dtml-if>
</dtml-in>

The 
      <dtml-call currentPrice="_['sequence-item']">
Doesn't work, I've tried another way or two.

I'm sure assignment must be straightforward, but I'm
probably missing something obvious. Can someone enlighten?
Thanks.

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