I created a form and added some VBScript code to it.  After having
difficulties with the code I deleted all of it.  Now I am adding code back to
the form but cannot reference any of the fields in it, apparently because it
does not recognize the namespace declaration.

The error I receive is:

After troubleshooting I figured out that you can't just copy in a substitute
for the namespace declaration that InfoPath automatically puts in your script
the first time you write to it.  I tested this by creating a new, blank form
and added one field and one button.  If I use the auto-generated namespace
declaration then clicking the button will display the value of the text box.  
If I copy over the namespace declaration (with a different timestamp) then I
get the same error as above.  

The code is as simple as this:

---------------------------------
'<namespacesDefinition>
XDocument.DOM.setProperty "SelectionNamespaces",
"xmlns:my=""http://schemas.microsoft.com/office/infopath/2003/myXSD/2008-03-03T19:04:56"""
'</namespacesDefinition>

Sub CTRL2_5_OnClick(eventObj)
    myText = XDocument.DOM.selectSingleNode("/my:myFields/my:dummyField").Text
    msgbox myText
End Sub
---------------------------------

...so what is going on here?  If the timestamp in the namespace declaration
is sensitive to each form then how do I re-create this for my form?

Also...curious...does the form query schemas.microsoft.com every time it
opens to translate the namespace?