[Zope] test for the existence of a nodeValue

Hi All, I'm pretty new to python and zope but would like to know how I can adapt this script below to test to see if nodeValue actually contains a value and if it doesn't then I would like to return a default value I can check for using my zpt that references this script: if not attobject: return '' version = attobject.get_viewable() nodes = version.content.documentElement.getElementsByTagName(attname) if not nodes: return '' return nodes[0].childNodes[0].nodeValue Two parameters are passed to this script attobject, attname. 'attobject' is an object id and 'attname' is the childNode with the nodeValue I wish to return. Hope someone can help, and I hope this makes sense. Thanks Jon