/ADI/Asset/Asset/Metadata[ AMS/@Asset_Class = "poster" ]

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//Asset/Metadata[ AMS/@Asset_Class = "poster" ]

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/ADI/Asset/Asset[ Metadata/AMS/@Asset_Class = "poster" ]

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//Asset[ Metadata/AMS/@Asset_Class = "poster" ]

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//Asset[ AMS/@Asset_Class = "package" and AMS/@Asset_Name = "some_package" ]/Asset[ Metadata/AMS/@Asset_Class = "poster" ]