When model differences are stored in the database, each user has the associated IModelDifference object. The IModelDifference.UserId property specifies the identifier of the user who owns the current IModelDifference object. If the UserId is not specified, the current IModelDifference object specifies the model differences layer shared by all users (administrator model differences). The IModelDifference.Aspects property exposes the list of model difference aspects (IModelDifferenceAspect objects). The aspect with an empty IModelDifferenceAspect.Name property is the default culture-neutral aspect. Aspects with the Name set to a certain language code are used in localized applications. The XML code of a particular model difference aspect is available via the IModelDifferenceAspect.Xml property.