powershell - adding XML sub-elements

Question

With PowerShell, I want to add several sub-elements into an XML tree.
I know to ADD ONE element, I know to add one or several attributes, but I don't understand how to ADD SEVERAL elements.

One way whould be to write a sub-XML tree as text
But I can't use this method because the elements are not added at once.

To add one element, I do that:

[xml]$xml = get-content $nomfichier
$newEl = $xml.CreateElement('my_element')
[void]$xml.root.AppendChild($newEl)

Works fine. This give me this XML tree:

$xml | fc
class XmlDocument
{
  root =
    class XmlElement
    {
      datas =
        class XmlElement
        {
          array1 =
            [
              value1
              value2
              value3
            ]
        }
      my_element =     <-- the element I just added
    }
}

Now I want to add a sub element to 'my_element'. I use a similar method:

$anotherEl = $xml.CreateElement('my_sub_element')
[void]$xml.root.my_element.AppendChild($anotherEl) <-- error because $xml.root.my_element is a string
[void]$newEl.AppendChild($anotherEl)               <-- ok
$again = $xml.CreateElement('another_one')
[void]$newEl.AppendChild($again)

This give this XML tree (partialy displayed):

my_element =
  class XmlElement
  {
    my_sub_element =
    another_one =
  }

Those are attributes, not sub-elements.
Sub-elements would be displayed as this:

my_element =
  [
    my_sub_element
    another_one
  ]

Question: How do I add several sub-elements, one at a time?

Answer 1

Have a look to the following example :

# Document creation
[xml]$xmlDoc = New-Object system.Xml.XmlDocument
$xmlDoc.LoadXml("<?xml version=`"1.0`" encoding=`"utf-8`"?><Racine></Racine>")

# Creation of a node and its text
$xmlElt = $xmlDoc.CreateElement("Machine")
$xmlText = $xmlDoc.CreateTextNode("Mach1")
$xmlElt.AppendChild($xmlText)

# Creation of a sub node
$xmlSubElt = $xmlDoc.CreateElement("Adapters")
$xmlSubText = $xmlDoc.CreateTextNode("Network")
$xmlSubElt.AppendChild($xmlSubText)
$xmlElt.AppendChild($xmlSubElt)

# Creation of an attribute in the principal node
$xmlAtt = $xmlDoc.CreateAttribute("IP")
$xmlAtt.Value = "128.200.1.1"
$xmlElt.Attributes.Append($xmlAtt)

# Add the node to the document
$xmlDoc.LastChild.AppendChild($xmlElt);

# Store to a file 
$xmlDoc.Save("c:TempTempFic.xml")

---

Edited

Remark : Using a relative path in Save will not do what you expect.