net462 
namespace System.Activities.Presentation.Model
{
    public abstract class ModelItem : INotifyPropertyChanged
    {
        public abstract AttributeCollection Attributes { get; }
    }
}
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.NET Framework 4.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net462
Assembly

System.Activities.Presentation , Version=4.0.0.0, PublicKeyToken=31bf3856ad364e35

Referencing

Your project needs an assembly reference to System.Activities.Presentation.

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This framework does not have platform annotations.

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