alternating node problems

This is my first application using DOM, so perhaps this isn't a 
ParsedXML problem.

In the loop, every other node does not work correctly, that is, the 
second and fourth nodes created in the list have a problem.  It appears 
in the DOM tree view, but the link does not show anything.  I can read 
the attributes of the affected node, but I can't add any additional 
children.  The XML itself seems well formed.

for std in request.addStandards:
     stdObj = context.getStandardFromID(std)
     newNode = context.importNode(stdObj,1)
     context.appendChild(newNode)
return RESPONSE.redirect('editUnitForm')

Help!

--Tom Hoffman
Feinstein High School