XML mit Powershell Ausgabe bearbeiten

<?xml version="1.0" encoding="utf-8"?>  
<Labelling version="1.0">  
<Document source_id="1">  
<Page source_id="1">  
<Header>
<SeparatorDUSERDEF>Number</SeparatorDUSERDEF>
<Property FormattingType="0" FormattingLength="32" FormattingRAlign="1">  
<PropertyName>GNumber</PropertyName>
<PropertyValue>4711</PropertyValue>
</Property>
</Header>
<ColumnHeader DataType="Text">  
<PropertyName>Referenz / OBK</PropertyName>
</ColumnHeader>
<ColumnHeader DataType="Text">  
<PropertyName>Artikel / Size</PropertyName>
</ColumnHeader>
<Line source_id="1" separator=";">  
<Label source_id="1">  
<Property FormattingType="0" FormattingLength="32" FormattingRAlign="1">  
<PropertyName>Artikel / Wide</PropertyName>
<PropertyValue>=AB+CD-EF7</PropertyValue>
</Property>
<Property FormattingType="0" FormattingLength="32" FormattingRAlign="1">  
<PropertyName>Referenz / OBK</PropertyName>
<PropertyValue>6,3x32mm 1,6B</PropertyValue>
</Property>
</Label>
</Line>
...
</Page>
</Document>
</Labelling>

[XML]$xmlfile = Get-Content "C:\datei.xml"  
$xmlfile.Labelling.Document.Page.Line.Label.Property.PropertyValue > "C:\tmp.txt"  
Get-Content -Path "C:\tmp.txt" -ReadCount 2 | ForEach-Object {-join ($_,' ',$_[1])}