Edit XML Nodes in PowerShell

function Edit-XmlNodes
{
    param(
        [xml] $doc,
        [string] $xpath = $(throw "xpath is a required parameter"),
        [string] $value = $(throw "value is a required parameter")
    )

    $nodes = $doc.SelectNodes($xpath)
    $count = $nodes.Count

    Write-Verbose "Found '$count' nodes with path '$xpath'."

    foreach ($node in $nodes)
    {
        if ($node -ne $null)
        {
            if ($node.NodeType -eq "Element")
            {
                $node.InnerXml = $value
            }
            else
            {
                $node.Value = $value
            }
        }
    }
}

#
# Example Usage:
#

$xml = New-Object System.Xml.XmlDocument
$xml.Load($nuspecPath)
Edit-XmlNodes -doc $xml -xpath "//*[local-name() = 'id']" -value $packageId
Edit-XmlNodes -doc $xml -xpath "//*[local-name() = 'version']" -value $nugetVersion

$depNodes=$xml.SelectNodes("/package/metadata/dependencies/group/dependency")
foreach ($depNode in $depNodes)
{
    $dependencyId = $depNode.id;
    Write-Verbose $dependencyId
    if ($dependencyId -eq "Hl7.Fhir.DSTU2")
    {
        Write-Host "Replacing dependency version for '$dependencyId' with '$nugetVersion'."
        $depNode.version = $nugetVersion
    }
}

Write-Verbose $xml.OuterXml
$xml.save($nuspecPath)