A method includes supplementing a database with multiple database views respectively representing a data model and including a first column representing a first attribute of the data model and a second column representing a second attribute of the data model; identifying a database view capable of retrieving requested data; retrieving instances of the data model represented by the identified view via the network using a first select criterion directed at the first column and a second select criterion directed at the second column of said view, the second attribute values of the data model instances being calculated selectively for instances having been dynamically identified by the first select criterion; and returning a result via the network.