[Zope] Lines property slicing

[Jason Spisak]

Zopsters,

I am trying to put a value into a particular line in a lines property. 
I thougt python list syntax would work like so:

   <!--#call "propertysheets.properties.manage_changeProperties(
              availability[0]=REQUEST['availability'])"-->

But I get a "keyword can't be an expression" eror when trying save the
DTML.  Anyone have experience with this?  I am trying to allow people to
store multiple times and edit them and save them again.

All my best,

-- 
Jason Spisak
webmaster@mtear.com