create a XML file with DOM

[Juliano Freitas]

Hello!

i'm usin a DOM module to process a xml file. I'm having problems with
the appenChild function. Why in my example below i can't append the
child 'ele' into the swdb.

<swdb>
<visualinfo/>
</swdb>

Juliano Freitas

=============================================
from xml.dom import *

xmldoc = getDOMImplementation()
print xmldoc

root = xmldoc.createDocument('', 'swdb', '')
root.firstChild

ele = root.createElement('visualinfo')
root.appendChild(ele)

swdb = root.toprettyxml()
print swdb
=============================================

Traceback (most recent call last):
File "/home/jubafre/teste_dom2.py", line 10, in -toplevel-
root.appendChild(root.createElement('visualinfo'))
File "/usr/lib/python2.3/xml/dom/minidom.py", line 1552, in
appendChild
raise xml.dom.HierarchyRequestErr(
HierarchyRequestErr: two document elements disallowed

 

[Peter Hansen]

i'm usin a DOM module to process a xml file. I'm having problems with
the appenChild function. Why in my example below i can't append the
child 'ele' into the swdb.

Does the following exploration help you? Note the difference between
what is output by root.toprettyxml() and root.firstChild.toprettyxml().
You need to go back to the XML specification and read up a little
bit about the difference between the "root" and the "document element".

c:\>python
Python 2.3.4 (#53, May 25 2004, 21:17:02) [MSC v.1200 32 bit (Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "c:\a\python23\lib\xml\dom\minidom.py", line 1552, in appendChild
raise xml.dom.HierarchyRequestErr(
xml.dom.HierarchyRequestErr: two document elements disallowed'<?xml version="1.0" ?>\n<swdb>\n\t<visualinfo/>\n</swdb>\n'


-Peter

 

[sunsat]

Thanks Peter,

Your explaination helped me ...

-Satish S Nandihalli