param(
  	[string] $filepath = $(throw (Write-Host "Enter the path to manifest.xsf (do not include the filename)!"))
 )

#loads the InfoPath form manifest, prepares namespace navigators
[System.Xml.XmlDocument]$manifestDocument = new-object System.Xml.XmlDocument;
$manifestDocument.set_PreserveWhiteSpace( $true );
$manifestPath = resolve-path ($filepath + "manifest.xsf");
$manifestDocument.Load($manifestPath.path);
$nsmgr = New-Object System.Xml.XmlNamespaceManager($manifestDocument.NameTable)
$nsmgr.AddNamespace("xsf", "http://schemas.microsoft.com/office/infopath/2003/solutionDefinition")

#find all the names of XSL views (which probably reference the variables)
$viewNames = $manifestDocument.SelectNodes("//xsf:mainpane", $nsmgr);
$views = new-object System.Collections.ArrayList;

#loads all views into memory
foreach ( $viewname in $viewNames) {
    [System.Xml.XmlDocument]$viewDoc = new-object System.Xml.XmlDocument;
    $viewDoc.set_PreserveWhiteSpace( $true );
    $viewpath = resolve-path ($filepath +  $viewname.GetAttribute("transform"));
    $viewDoc.Load($viewpath.path);
    $vnsmgr = New-Object System.Xml.XmlNamespaceManager($viewDoc.NameTable)
    $vnsmgr.AddNamespace("xsl", "http://www.w3.org/1999/XSL/Transform")
    $vnsmgr.AddNamespace("xd", "http://schemas.microsoft.com/office/infopath/2003");
    $n = $views.add($viewDoc) ;
}



#list of all potentially unused variables
$nodes = $manifestDocument.SelectNodes("//xsf:xmlToEdit", $nsmgr);


foreach ($node in $nodes) {
    $nodeName = $node.GetAttribute("name");
    $select = ("//*[@xd:xmlToEdit='" + $nodeName + "']");
    
    $currNodeUse = 0;
    #looks for every variable name in every XSL view
    foreach ($view in $views) {
        $nodeuses = $view.SelectNodes( $select, $vnsmgr);
        if ($nodeuses.count -gt 0) {
            $currNodeUse = 1;
        }
    }
    #the xmlToEdit might be referenced in the manifest.xsf file as well
    $select = ("//*[@xmlToEdit='" + $nodeName + "']");
    $nodeuses = $manifestDocument.SelectNodes( $select, $vnsmgr);
    if ($nodeuses.count -gt 0) {
        $currNodeUse = 1;
    }
    
    
    #the variable was not referenced in XSL views as well as in manifest.xsf - we may delete it
    if ($currNodeUse -eq 0) {
        
        $parent = $node.parentNode;
        $temp = $parent.removeChild($node); 
    }
}
#saving back to manifest.xsf
Set-Content -Path ($manifestPath.path) -Value $manifestDocument.OuterXml -encoding UTF8