On 3/8/07, tonylabarbara@aol.com <tonylabarbara@aol.com> wrote: 
> I thought I could call a variable in a page template by defining it and then 
> putting a ? in front of it in a URL, like this: 
 
Incorrect, you can only use ? to interpolate variables into a path expression: 
 
 <span tal:define="foo string:bar" 
  tal:content="here/?foo"></span> 
 
The above example will look up 'bar' and render it as the content of the span. 
 
-- Martijn Pieters