ion The concept of data abstraction has received much attention in the programming language community. Recently, there has been interest in the use of data abstraction with respect to data base systems. 18 Many data base systems support abstraction related facilities such as views, integrity constraints and triggers. 3,12,19,33 For example, a view provides a form of abstraction in that the user...

The compilation of cerebrospinal fluid (CSF) patient data together with a graphic display of immunoglobulin patterns in a single CSF report has two main advantages: analytical and clinical; plausibility control of a complex set of data improves quality assessment and allows improved clinical specificity and sensitivity for recognition of disease-related “typical” data patterns. The widespread u...

In the near future, we can expect a great variety of languages to be proposed for interrogating and updating data bases. This paper attempts to provide a theoretical basis which may be used to determine how complete a selection capability is provided in a proposed data sublanguage independently of any host language in which the sublanguage may be embedded. A relational algebra and a relational ...

— The design of a data base schema can be organized through a set of refînement steps, that gradually introducé progressive details in the description of reality. In this approach, suitable restrictions to refînement rules allow to guarantee both conceptual and logical properties. Following this approach the formalism of hypergraphs and hypergraph grammars can be applied to investigate various ...

Biosystematic information is all data that may be useful to man about organisms, such as what is it, what is it called, what does it look like, where does it occur, what does it do, when does it do it, and what does all this mean to me (= economic importance). Biosystematic information is organized by names, arranged in a hierarchical classification based on shared (synapomorphic) similarities....

concepts cfrelational data base management systems are described. Characteristics of the relational approach are identi-jied and compared with present implementations of hierarchical and network data base systems. Depending on the application, a user may experience one or more of the following benejits of rela-tional systems described in this paper: ease of understanding, increased data indepen...

Many of the currently available sensors do not provide simple, numerical values but more complex data like a list of other devices in range. Although these sensors can, in the general case, not be transformed to numerical values, they nonetheless provide valuable information about the device or user context. For exploiting all available context information, it is thus important to also regard o...

This paper discusses the likely evolution of commercial data managers over the next several years. Topics to be covered include: Why SQL has become an intergalactic standard. Who will benefit from SQL standardization. Why the current SQL standard has no chance of lasting. Why all data base systems will be distributed soon. What new technologies are likely to be commercialized. Why vendor indepe...

The paper presents formalism and Implementation aspects of the programming system for Artificial Intelligence (AI) applications. The system contains Resolrer which Is based on the Ideas of LISP-like languages combined with new AI formalisms. Semantic Memory Is another part of the system which Is Implemented by means of hlerarohloal DataBase. Interaction with a user Is goreraed by Metaprocessor ...