[Zope] periods in objects; i.e. hostnames, IPs, etc

Can someone take a look at this- regarding periods in object names Generally I would "_['hostname']", but there are already double quotes for the zsql object call- <dtml-in "qrySelectKey(sqlTable=sqlTable, sqlKey=sqlKey, sqlKeyStr=_['hostname'])"> ... </dtml-in> the above fails finding the object named by the first portion of the hostname (up to the period) thanks in advance Chas.