How to put a comments for each variable?

hello

i using following xml read values powershell script. want put comments each variable want put comment , comment should not create while reading values officephone xml value. please advise

<officephone>+44 123-456-7890</officephone> <# use phone in +99 999 999 999 format #>

<location>
  <address>
    <city>london</city>
    <street>196 high street</street>
    <pobox>pbox</pobox>
    <state>londons</state>
    <zip>e17</zip>
    <country>uk</country>
    <officephone>+44 123-456-7890</officephone>
   </site>
</location>

$comment = $xml.createcomment('use phone in +99 999 999 999 format')
$node = $xml.location.site.address.selectsinglenode('officephone')
$node.appendchild($comment)

also xml badly broken.

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\_(ツ)_/

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