Housekeeping wrt comments;Several code optimizations

scripts/Update-OvfConfiguration.ps1

@@ -50,53 +50,46 @@ $NS = [System.Xml.XmlNamespaceManager]$XML.NameTable
 [void]$NS.AddNamespace('ns', $XML.DocumentElement.xmlns)
 [void]$NS.AddNamespace('ovf', $XML.DocumentElement.ovf)
 [void]$NS.AddNamespace('rasd', $XML.DocumentElement.rasd)
+[void]$NS.AddNamespace('vmw', $XML.DocumentElement.vmw)
 
-# Create copy of default resourceType=17 (=Harddisk) node
+# Create copy of existing 'Item/ResourceType'=17 (=Hard disk) node
 $XMLDiskTemplate = $XML.SelectSingleNode("//ns:VirtualHardwareSection/ns:Item/rasd:ResourceType[.='17']", $NS).ParentNode.CloneNode($True)
 
 ForEach ($Disk in $OVFConfig.DynamicDisks) {
-    # Determine next free available diskId
+    # Determine next free available 'diskId'
     $XMLDisks = $XML.SelectNodes("//ns:DiskSection/ns:Disk[contains(@ovf:diskId,'vmdisk')]", $NS)
-    $DiskId = $XMLDisks.Count + 1
+    $DiskId = 1
     While ($XMLDisks.DiskId -contains "vmdisk$($DiskId)") {
         $DiskId++
     }
 
+    # Add new 'Disk' node (under 'DiskSection')
     $XMLDisk = $XML.CreateElement('Disk', $XML.DocumentElement.xmlns)
-    Switch ($Disk.UnitSize) {
+    $PowersMap = @{
-        'KB' {
+        KB = 10
-            $Powers = 10
+        MB = 20
+        GB = 30
+        TB = 40
+        PB = 50
     }
-        'MB' {
+    If ($PowersMap.Keys -notcontains $Disk.UnitSize) {
-            $Powers = 20
+        # Invalid UnitSize; skipping adding new disk
-        }
-        'GB' {
-            $Powers = 30
-        }
-        'TB' {
-            $Powers = 40
-        }
-        'PB' {
-            $Powers = 50
-        }
-        default {
-            # Invalid UnitSize; skipping modification of existing disk
         Continue
     }
-    }
+
-    [void]$XMLDisk.SetAttribute('capacityAllocationUnits', $NS.LookupNamespace('ovf'), "byte * 2^$($Powers)")
+    [void]$XMLDisk.SetAttribute('capacityAllocationUnits', $NS.LookupNamespace('ovf'), "byte * 2^$($PowersMap[$Disk.UnitSize])")
     [void]$XMLDisk.SetAttribute('format', $NS.LookupNamespace('ovf'), 'http://www.vmware.com/interfaces/specifications/vmdk.html#streamOptimized')
     [void]$XMLDisk.SetAttribute('diskId', $NS.LookupNamespace('ovf'), "vmdisk$($DiskId)")
     [void]$XMLDisk.SetAttribute('capacity', $NS.LookupNamespace('ovf'), '${{vmconfig.disksize.{0}}}' -f $DiskId)
     [void]$XMLDisk.SetAttribute('populatedSize', $NS.LookupNamespace('ovf'), 0)
     [void]$XML.SelectSingleNode('//ns:DiskSection', $NS).AppendChild($XMLDisk)
 
-    # Add new resourceType nodes
+    # Add new 'Item/ResourceType' node (under 'VirtualHardwareSection')
     $XMLDiskItem = $XMLDiskTemplate.CloneNode($True)
     $XMLDiskItem.SelectSingleNode('rasd:AddressOnParent', $NS).InnerText = ($DiskId - 1)
     $XMLDiskItem.SelectSingleNode('rasd:ElementName', $NS).InnerText = "Hard Disk $($DiskId)"
     $XMLDiskItem.SelectSingleNode('rasd:HostResource', $NS).InnerText = "ovf:/disk/vmdisk$($DiskId)"
-    # Determine next free available InstanceID
+    # Determine next free available 'InstanceID'
     $InstanceIDs = $XML.SelectNodes('//ns:VirtualHardwareSection/ns:Item/rasd:InstanceID', $NS)
     $InstanceID = 1
     While ($InstanceIDs.InnerText -contains $InstanceID) {
@@ -147,14 +140,14 @@ If ($OVFConfig.DeploymentConfigurations.Count -gt 0) {
     Write-Host "Inserted 'DeploymentOptionSection' with $($Configuration.Count) nodes"
 
     If ($OVFConfig.DeploymentConfigurations.Count -eq $OVFConfig.DeploymentConfigurations.Size.Count) {
-        # Create copies of default resourceType nodes
+        # Create copies of existing 'Item/ResourceType' nodes
         $XMLCPUTemplate = $XML.SelectSingleNode("//ns:VirtualHardwareSection/ns:Item/rasd:ResourceType[.='3']", $NS).ParentNode.CloneNode($True)
         $XMLMemoryTemplate = $XML.SelectSingleNode("//ns:VirtualHardwareSection/ns:Item/rasd:ResourceType[.='4']", $NS).ParentNode.CloneNode($True)
-        # Delete default resourceType nodes
+        # Delete existing nodes
         ForEach ($Node in $XML.SelectNodes("//ns:VirtualHardwareSection/ns:Item/rasd:ResourceType[.='3' or .='4']", $NS).ParentNode) {
             [void]$Node.ParentNode.RemoveChild($Node)
         }
-        # Add updated resourceType nodes
+        # Add adjusted 'Item/ResourceType' nodes
         ForEach ($Configuration in $OVFConfig.DeploymentConfigurations) {
             $XMLCPU = $XMLCPUTemplate.CloneNode($True)
             [void]$XMLCPU.SetAttribute('configuration', $NS.LookupNamespace('ovf'), $Configuration.Id)
@@ -182,7 +175,7 @@ ForEach ($ExtraConfig in $OVFConfig.AdvancedOptions) {
 
     [void]$XML.SelectSingleNode('//ns:VirtualHardwareSection', $NS).AppendChild($XMLExtraConfig)
 }
-Write-Host "Added $($OVFConfig.AdvancedOptions.Count) 'vmw:ExtraConfig' nodes"
+Write-Host "Added $($OVFConfig.AdvancedOptions.Count) 'vmw:ExtraConfig' node(s)"
 
 $XMLProductSection = $XML.SelectSingleNode('//ns:ProductSection', $NS)
 If ($XMLProductSection -eq $Null) {
@@ -211,7 +204,7 @@ ForEach ($Category in $OVFConfig.PropertyCategories) {
     ForEach ($Property in $Category.ProductProperties) {
         $XMLProperty = $XML.CreateElement('Property', $XML.DocumentElement.xmlns)
     
-        $XMLProperty.SetAttribute('key', $NS.LookupNamespace('ovf'), $Property.Key)
+        [void]$XMLProperty.SetAttribute('key', $NS.LookupNamespace('ovf'), $Property.Key)
         Switch -regex ($Property.Type) {
             '^boolean' {
                 [void]$XMLProperty.SetAttribute('type', $NS.LookupNamespace('ovf'), 'boolean')