[XML-SIG] To .document or not to .document

[Randall Hopper]

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When xml.dom.utils.FileReader is used to read in an XML DOM, the DOM may or
may not have a leading .document component depending on whether the XML was
read from a file or a stream.


Why the difference?


For example, the attached script reads a simple XML script from the XML
variable via StringIO.  If you change:

   reader = utils.FileReader().readStream( stream )
to:
   reader = utils.FileReader( "elements.xml" )

then the script doesn't work unless you change:

   doc       = reader
to:
   doc       = reader.document

There's an extra DOM component here.

Thanks for any insight.

-- 
Randall Hopper
aa8vb@yahoo.com

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#!/usr/bin/env python

from xml.dom import utils,core
import string, sys, StringIO

XML = """\
<?xml version="1.0"?>

<root>
  <element1/>
  <element2/>
  <element3/>
</root>
"""

stream = StringIO.StringIO( XML )

reader = utils.FileReader().readStream( stream )

doc       = reader
rootNode  = doc.documentElement
rootNode2 = doc.childNodes.item(0)
print rootNode
print rootNode2

element1  = rootNode.childNodes.item(0)
element2  = rootNode.childNodes.item(1)
element3  = rootNode.childNodes.item(2)
print element1, element2, element3

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Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment; filename="elements.xml"

<?xml version="1.0"?>

<root>
  <element1/>
  <element2/>
  <element3/>
</root>

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