Mine

<html>
   <head>
   <title tal:content="template/title">The title</title>
   </head>
   <body tal:define="result python:context.zsql_select_acao(descricao='');
                     start python:path(request/start) or 0;
                     batch python:modules['ZTUtils'].Batch(result, 
                     size=10, 
                     start=start);
                     previous python:batch.previous;
                     next python:batch.next">
<p>
   <a tal:condition="previous"
   tal:attributes="href string:${request/URL0}?start:int=${previous/first}"
   href="previous_url">previous</a>
   <a tal:condition="next"
   tal:attributes="href string:${request/URL0}?start:int=${next/first}"
   href="next_url">next</a>
</p> 

 </body>
   </html>