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Is there syntax to state where attribute does not exist?
Dim xe As XElement = _
<xml>
<el att1="ABC" att2="XYZ"/>
<el att1="ABC"/>
<el/>
</xml>
Dim xe2 As IEnumerable(Of XElement)
xe2 = From c In xe.<el> Where c.@att1 = "ABC" And DoesNotExist(c.@att2)
'Return: <el att1="ABC"/>
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