//admin_server:request/*/action
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is short for

/descendant::admin_server:request/child::*/child::action
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There are three node tests in that path

• descendant::admin_server:request
• child::*
• child::action

There is one prefix in that path

• admin_server

There are two namespaces referenced by that path

• Which ever namespace is associated with admin_server (referenced by descendant::admin_server:request)
• The null namespace (referenced by child::action)

(* matches nodes in any namespace)