Parameter Magic

Function LoadParameters {
    if ($PSScriptRoot) {$ScriptPath = $PSScriptRoot} else {$ScriptPath = "C:\EIC\Deploy"}
    [xml]$Script:XML = Get-Content "$ScriptPath\Settings.xml"
    $SpecialNodes = @("Hosts","DNSRecords","DerivedParameters")
    $ExclusionXPath = ""
    $SpecialNodes | % { $ExclusionXpath += "[not(self::$_)]" }
    $ConfigNodes = $XML | Select-XML -XPath "//Configuration/*$ExclusionXpath"

    $ConfigNodes | % { $_.Node.ChildNodes.Name | % { Set-Variable $_ -Value ($xml.SelectSingleNode("//$_").innertext) -Scope Script } }
    $XML.Configuration.Hosts.ChildNodes | % { Set-Variable $_.Name -Value $_ -Scope Script }

    $DerivedParameters = $xml | Select-XML -XPath "//Configuration/DerivedParameters"
    $DerivedParameters | % { $_.Node.ChildNodes.Name | %{ Set-Variable $_ -Value (& ([scriptblock]::create("$($xml.SelectSingleNode(""//$_"").innertext)"))) -Scope Script -Force }}
    }