Core Information Model Sample Clauses

Core Information Model. User Perspective‌ From the point of view of the user or of the Active System, we can summarize the Infor- mation Model as shown in Figure 12. Figure 12: Information Model from User Perspective As stated above in previous Section, the three classes Content, Context, and Situation are the core elements of the Information Model. Both, Context and Content are Preser- vation Entities, i.e. they are elements, that the user can provide to the archival system for preservation. Content can be an individual content Item or a Collection, which will again contain content objects. As another child of Content, the Information Model contains the concept Condensa- tion, which is an object created from a content object such as a collection or an content item by condensation operations such as text summarization. Information reduction is an important concept in the forgetting environment and is one of the possible forgetting ac- tions resulting in condensed objects that can replace or augment and improve the original projects. Information on Context, the second core concept of the PoF Information Model, is kept in the archive for helping in the interpretation of content objects. Context can be pro- vided in many different forms and for content on all levels of granularity, including indi- vidual items, collections as well as situations. In addition, we distinguish Local Context and World Context depending upon the scope of the respective information: this distin- guishes information that is only known in the local scope and information considered as world knowledge. The third core element, Situation, is also a child of Content. This provides a high flex- ibility allowing nesting of situations as well as for nested collections to be assigned to a Situation. A Situation is represented by a Situation Profile, an associated Profile storing the properties of the Situation (details of the Situation Profile are described in Table 2). As shown in Figure 12, the Situations in Reference Model are linked by the association rep- resentedBy to the Situation Profile. As explained above, Situation and SituationProfile are going beyond the classic and more rigid OAIS [CCSDS, 2012] specifications. A further important concept in the Information Model is ownership of the preserved con- tent. This is modeled by introducing the concept of an Actor, which can be a Person or a System Instance of the Active system. For modelling ownership, the Actor is linked to the Content element via the relatio...