I have a XML like this:

<Root>
   <VehicleInfo>
      <VINInfo />
   </VehicleInfo>
   <ComparableVehicles>
      <VehicleInfo>
         <VINInfo>
            <VIN>
               <VINNum>Something</VINNum>
            </VIN>
         </VINInfo>
      </VehicleInfo>
   </ComparableVehicles>
</Root>

I use this method to verify if a XML node exist:

        ' See if a node exists
        ' expC1 Node
        Public Function IsXMLNode(ByVal tcNode As String) As Boolean

            ' Select the node
            If oXmlNameSpaceManager Is Nothing Then
                oXmlNode = oXmlDocument.SelectSingleNode(tcNode)
            Else
                oXmlNode = oXmlDocument.SelectSingleNode(tcNode, oXmlNameSpaceManager)
            End If

            ' See if we obtained the node
            If oXmlNode Is Nothing Then
                Return False
            End If

            Return True
        End Function

I use this code to verify if a specific XML node exists:

' If we have the //VehicleInfo/VINInfo/VIN/VINNum
If loXml.IsXMLNode("//VehicleInfo/VINInfo/VIN/VINNum") Then
End If

And, it does find it. However, that branch is not under the root but under ComparableVehicles. Why does it find it?