Change XML Value of element with specific Attribute in Powershell - powershell

Question

i just can't wrap my head around XML so please help me.
i have following small xml file
<OSDCollBuild>
<Group Name="OSD">
<Value key="1">1809</Value>
<Value key="2">1909</Value>
<Value key="3">1909.1</Value>
<Value key="4">20H2</Value>
</Group>
<Group Name="Office">
<Value key="1">Standard</Value>
<Value key="2">Professional</Value>
<Value key="3">Student</Value>
</Group>
</OSDCollBuild>
now i want to change the Value of e.g. Group Name=OSD Value key=3 to lets say "1909.2"
but i do not how to tell Powerhsell to set inner text to THAT specific Element.
i have tryed to SelectSingleNode
and i get thet far
$xml.OSDCollBuild.Group.SelectSingleNode("//*[#Name='$Group'])
and now i don't now how to get further.

Answer 1

You can use the following xPath to get the node with Group Name=OSD Value key=3:
//OSDCollBuild/Group[#Name='OSD']/Value[#key='3']
Here is a full example to change the text value:
$xml = [xml]#"
<OSDCollBuild>
<Group Name="OSD">
<Value key="1">1809</Value>
<Value key="2">1909</Value>
<Value key="3">1909.1</Value>
<Value key="4">20H2</Value>
</Group>
<Group Name="Office">
<Value key="1">Standard</Value>
<Value key="2">Professional</Value>
<Value key="3">Student</Value>
</Group>
</OSDCollBuild>
"#
# find the node to change
$node = $xml.SelectSingleNode("//OSDCollBuild/Group[#Name='OSD']/Value[#key='3']")
# change the value
$node.InnerText = "1909.2"
# dump the xml to verify the change
$xml.OuterXml
Output:
<OSDCollBuild>
<Group Name="OSD">
<Value key="1">1809</Value>
<Value key="2">1909</Value>
<Value key="3">1909.2</Value>
<Value key="4">20H2</Value>
</Group>
<Group Name="Office">
<Value key="1">Standard</Value>
<Value key="2">Professional</Value>
<Value key="3">Student</Value>
</Group>
</OSDCollBuild>