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'For complete examples and data files, please go to https://github.com/groupdocsmetadata/GroupDocs_Metadata_NET
Dim expectedValue As New ResourceRef() With { _
    .DocumentUri = "074255bf-78bc-4002-89dc-cd7538b40fe0", _
 .InstanceId = "42a841b7-48d4-4988-8988-53d2c6e7525d" _
}

' create XmpMediaManagementPackage
Dim package As New XmpMediaManagementPackage()

' update DerivedFrom property
package.SetDerivedFrom(expectedValue)

' check value
Dim value As ResourceRef = DirectCast(package("xmpMM:DerivedFrom"), ResourceRef)