Dear Martin, dear all, I do not agree with the restriction that an E8 Acquisition depends only on a compensation of money between two actors.
In our museum an acquisition is triggered by gifts , bequests , loans, inheritance , exchange of objects. In every case we will have a contract between two parties. So an acquisition is a necessary cloudy term which stands for different kind of contracts, which could be specialized but which have always in common, that the legal ownership is transferred. Best regards Siegfried Von: Crm-sig [mailto:[email protected]] Im Auftrag von martin Gesendet: Mittwoch, 17. Februar 2016 19:04 An: crm-sig <[email protected]> Betreff: [Crm-sig] Homework, Purchase Dear All, Here my naive attempts to define purchase etc., may be some financial or legal experts can check or improve... E?? Purchase Subclass of: E8 Acquisition Superclass of: Scope note: This class comprises transfers of legal ownership from one or more instances of E39 Actor to one or more other instances of E39 Actor, which are completely compensated by payment of a monetary amount. In more detail, a purchase contract initiates a monetary obligation of the receiving party of the transferred objects to the giving party. An instance of Exx Purchase begins with the contract or equivalent agreement and ends with the successful transfer of the monetary amount to the giving party. In case the activity is abandoned before both parties have fulfilled their contractual obligations, the activity is not regarded as an instance of Exx Purchase. This class is a very specific case of much more complex social business practices of exchange of good and the creation and satisfaction of related social obligations, which may be described by a compatible extension of this model. Purchase activities which define individual sales prices per object can be modelled by instantiating Exx Purchase for each object individually and as part of an overall transaction. Properties: P?? had sales price (was sales price of)): E?? Monetary Amount E?? Monetary Amount Subclass of: E54 Dimension (Later, E54 Dimension has to be generalized to "Quantity") Scope note: This class comprises quantities of monetary possessions or obligations in terms of their nominal value with respect to a particular currency. These quantities may be abstract accounting units, the nominal value of a heap of coins or banking notes at the time of validity of the respective currency, the nominal value of a bill of exchange or other documents expressing monetary claims or obligations. Properties: P?? has currency (was_currency_of): E?? Currency P?? has amount : E60 Number E?? Currency Subclass of: E55 Type Scope note: This class comprises the units in which a monetary system supported by an administrational authority or other community quantifies and compares all monetary amounts declared in on such unit arithmetically. The unit of a monetary system must describe a nominal value which is kept constant by its authority and an associated banking system, and not by market value. For instance, one may pay with grams of gold, but the respective monetary amount may be agreed on as the gold price in US dollars the day of the payment. Under this definition, British pounds, U.S. dollars, and European euros are examples of currency, but “grams of gold” are not. One monetary system has only one currency. Instances of this class must not be confused with coin denominations, such as “Dime” or “Sestertius”. Non-monetary exchange of values in terms of quantities of a particular type of goods, such as cows, do not constitute a currency. Examples: “As” (Roman mid republic), “Euro”, “US Dollar” -- -------------------------------------------------------------- Dr. Martin Doerr | Vox:+30(2810)391625 | Research Director | Fax:+30(2810)391638 | | Email: [email protected]<mailto:[email protected]> | | Center for Cultural Informatics | Information Systems Laboratory | Institute of Computer Science | Foundation for Research and Technology - Hellas (FORTH) | | N.Plastira 100, Vassilika Vouton, | GR70013 Heraklion,Crete,Greece | | Web-site: http://www.ics.forth.gr/isl | --------------------------------------------------------------
