(PowerShell) Traverse Direct Children via FirstChild / NextSibling, or LastChild / PreviousSibling

Demonstrates some ways to iterate over direct child nodes using the FirstChild / NextSibling and LastChild / PreviousSibling methods.

The input XML, available at http://www.chilkatsoft.com/data/fruit.xml, is this:

<root>
    <fruit color="red">apple</fruit>
    <fruit color="green">pear</fruit>
    <veg color="orange">carrot</veg>
    <meat animal="cow">beef</meat>
    <xyz>
        <fruit color="blue">blueberry</fruit>
        <veg color="green">broccoli</veg>
    </xyz>
    <fruit color="purple">grape</fruit>
    <cheese color="yellow">cheddar</cheese>
</root>

Download: Chilkat .NET Assemblies

[Reflection.Assembly]::LoadFile("C:\myAssemblies\ChilkatDotNet2.dll")

$xml = New-Object Chilkat.Xml

#  The sample input XML is available at http://www.chilkatsoft.com/data/fruit.xml
$success = $xml.LoadXmlFile("fruit.xml")
if ($success -ne $true) {
    $($xml.LastErrorText)
    exit
}

#  Iterate over the direct children by using FirstChild / NextSibling
$child = $xml.FirstChild()
while (!($child -eq $null )) {
    $($child.Tag + " : " + $child.Content)
    $nextSibling = $child.NextSibling()

    $child = $nextSibling
}

$("-----")

#  Do the same, but with FirstChild2 / NextSibling2 to avoid
#  creating so many XML object instances:
$success = $xml.FirstChild2()
while ($success -eq $true) {
    $($xml.Tag + " : " + $xml.Content)
    $success = $xml.NextSibling2()
}

#  Revert back up to the parent:
$xml.GetParent2()

$("-----")

#  Iterate in reverse order using LastChild / PreviousSibling
$child = $xml.LastChild()
while (!($child -eq $null )) {
    $($child.Tag + " : " + $child.Content)
    $prevSibling = $child.PreviousSibling()

    $child = $prevSibling
}

$("-----")

#  Do the same, but with LastChild2 / PreviousSibling2 to avoid
#  creating so many XML object instances:
$success = $xml.LastChild2()
while ($success -eq $true) {
    $($xml.Tag + " : " + $xml.Content)
    $success = $xml.PreviousSibling2()
}

#  Revert back up to the parent:
$xml.GetParent2()