[Zope] DTML-IN only over special documents??

Hi, I've got a question concerning dtml-in. I know that it is possible to loop only over DTML Documents in a folder containing objects of different type. But is it possible to loop only over documents, that id's e.g. start with 'mydoc' ??? Example-folder with the objects: mydoc1 mydoc35 picture567 picture33 mydoc98 So dtml-in shall only loop over 'mydoc1', 'mydoc35', 'mydoc98' How can I do that? TIA Marc