PointerRef

public struct PointerRef
{
    public EbxImportReference External { get; }
    public object Internal { get; }
    public PointerRefType Type { get; }
}

var externalRef = new EbxImportReference 
{ 
    FileGuid = assetGuid, 
    ClassGuid = instanceGuid 
};
var pointer = new PointerRef(externalRef);

// Create external reference
var pointer = new PointerRef(fileGuid);

// Create null reference
var nullPointer = new PointerRef(Guid.Empty);

var obj = assetRoot.GetObject("MyObject");
var pointer = new PointerRef(obj);

public override bool Equals(object obj)

public override int GetHashCode()

public static bool operator ==(PointerRef A, object B)
public static bool operator !=(PointerRef A, object B)

public enum PointerRefType : byte
{
    Null = 0,      // No reference
    Internal = 1,  // Reference to object in same asset
    External = 2   // Reference to object in another asset
}

public struct EbxImportReference
{
    public Guid FileGuid;   // GUID of the referenced asset file
    public Guid ClassGuid;  // GUID of the referenced instance
}

if (pointer.Type == PointerRefType.External)
{
    Console.WriteLine($"External reference: {pointer.External.FileGuid}");
}
else if (pointer.Type == PointerRefType.Internal)
{
    Console.WriteLine($"Internal reference: {pointer.Internal}");
}
else
{
    Console.WriteLine("Null pointer");
}

if (pointer.Type == PointerRefType.External)
{
    var referencedAsset = assetManager.GetEbx(pointer.External.FileGuid);
    var referencedObject = referencedAsset.GetObject(pointer.External.ClassGuid);
}

// Link to another object in the same asset
var targetObject = asset.RootObject.GetProperty("TargetEntity");
myObject.SetPropertyValue("Reference", new PointerRef(targetObject));

// Link to object in another asset
var externalRef = new EbxImportReference
{
    FileGuid = targetAssetGuid,
    ClassGuid = targetInstanceGuid
};
myObject.SetPropertyValue("ExternalLink", new PointerRef(externalRef));