Fix to getElementsByTagName which only shows up when using XMLDocument. Thanks to Andrew Kuchling.

lib/python/OFS/ZDOM.py

@@ -438,6 +438,7 @@ class Element(Node):
             if (child.getNodeType()==ELEMENT_NODE and \
                     child.getTagName()==tagname or tagname== '*'):
                 nodeList.append(child)
+            if hasattr(child, 'getElementsByTagName'):
                 n1 = child.getElementsByTagName(tagname)
                 nodeList = nodeList + n1._data
         return NodeList(nodeList)