Saltor, F. "On the Power to Derive External Schemata from the Database Schema" 2nd Int. Conf. on Data Engineering (Los Angeles, 1986). IEEE-CS Press. Home/Search Document Not in Database Summary Related Articles Check |
This paper is cited in the following contexts:
Diversity with cooperation in database schemata: Semantic.. - Saltor, García-Solaco (1993) (1 citation) Self-citation (Saltor) (Correct)
....different kinds of cooperation (from an organizational point of view) and taking into account security issues. Also, this paper analyzes technical characteristics at the level of issues and principles; technicalities are omitted here, and can be found elsewhere (Tsichritzis and Klug 1978) (Saltor 1986), Saltor 1987) Sheth and Larson 1990) Saltor, Castellanos and Garc a Solaco 1991) Castellanos, Saltor and Garc a Solaco 1992) The rest of the paper is organized as follows: Section 2 introduces Semantic Relativism as the feature corresponding to this ability to cooperate maintaining ....
....possible to design a database schema, and to define a derivation from it, to obtain precisely the external schema representing a given user s conception. The power to derive external schemata from the database schema is therefore the measure of semantic relativism of a DBMS, and of its data model (Saltor 1986). The semantic relativism of pre relational models is quite limited, because they only allow external schemata that are strict subsets of the database schema. Relational DBMSs may use the whole power of relational calculus or algebra to derive external schemata ( views ) and have therefore a high ....
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Saltor, F. "On the Power to Derive External Schemata from the Database Schema" 2nd Int. Conf. on Data Engineering (Los Angeles, 1986). IEEE-CS Press.
Suitability of Data Models as Canonical Models for .. - Saltor.. (1991) (40 citations) Self-citation (Saltor) (Correct)
.... to derive external schemas (contrast with what is called semantic relativism in [Br82] SP90] and relativism in [HM81] For example, the relational model is able to use the whole power of its algebra to derive external schemas (views) and has therefore a high degree of semantic relativism ([Sa86]) 3 Representation ability in the interoperability environment Following the five level schema architecture of [SL90] when a number of preexisting DBs, called component databases, are to interoperate, a canonical data model (CDM) common to the whole federation, must be adopted. The database ....
....stand alone (centralized or distributed) DBs in the sense seen in 2.2. This requires a high degree of semantic relativism, expressed in: Characteristic SRb: the operations of the CDM must have a power to derive external schemas at least as great as the view mechanism using the relational algebra ([Sa86]) In particular, it must be able to produce any kind of structures available in the model. In addition to this essential characteristics, there are two other characteristics that are recommended for interoperability. 3.2.1 One basic structure To facilitate schema integration from export schemas ....
[Article contains additional citation context not shown here]
F. Saltor: "On the Power to Derive External Schemata from the Database Schema". 2nd IEEE Int. Conf. on Data Engineering, Los Angeles.
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