[Zope] defining counters in zope(newbie)

[Sudhir Kumar]

How do I keep track of counter in Zope.

For example, if I want to produce the following output:

1.    book1            Author1
2.    book2
3.    book3
4.    book4            Author2
5.    book5
6.    book6
7.    book7            Author3

i.e. book1, book2, book3 are by Author1, etc.


I need something like the following
.......
    count = 0   <-------------------------------intended
    <dtml-in   "AuthorList()">
            <dtml-let   author="sequence-item">
            <dtml-in  "BookList(author)">
                  <dtml-if "sequence-index==0">
                         <dtml-var count> sequence-item <dtml-var
author>
                  <dtml-else>
                         <dtml-var count> sequence-item
                  count=count+1   <---------------------- intended
                  </dtml-if>
             </dtml-in></dtml-let>
    </dtml-in>

I do not know how to set count=0, count=count+1 in dtml.
Any help will be greatly appreciated.

Thank you,
-- sudhir