I have a lot of REQUEST like this one to check, depending on what documents are in the folder. <dtml-unless SOMEREQ> <dtml-call "REQUEST.set('SOMEREQ','defaultvalue')"> </dtml-unless> so i gave all documents concerned 2 properties myPropName,myPropValue (in our example myPropName : SOMEREQ myPropValue : defaultvalue) So i'm able to iterate the documents and check the properties and set the REQUEST. <dtml-in "objectValues(['DTML Document'])"> <dtml-if "_.hasattr(this(), 'myPropName') == 1"> <dtml-call "REQUEST.set(myPropName,myPropValue)"> </dtml-if> </dtml-in> this works OK. But, I can't find a way to generate the <dtml-unless SOMEREQ> tag. Passing the value of myPropName seems to fail (erreur while parsing the syntax, or check the 'myPropName' instead of his value). I tried a lot of things and syntax around <dtml-unless myPropName>, but it failed. Is it a dtml-unless limit, or just a bad syntax i'm writing ? Thnaks in advance.