User Defined Functions (UDF) are an important feature of analytical SQL as they allow processing of data right inside of relational queries. Typically UDFs have to be written in a special language which sometimes diminishes their practical use, especially when required libraries are not available in this language. An alternative approach is to allow users to provide functions as native low-leve...

We examine the maintenance of data consistency in the presence of application-database interactions. Currently, a programmer must insert explicit checks to ensure that data are consistent with respect to the application’s and the database’s requirements. This explicit handcoding of integrity constraint checks is error-prone and results in less maintainable code when the integrity constraints on...

We describe the implementation of Hyperlog , a graph-based declarative language which supports both queries and updates over a graph-based data model called the Hypernode Model. This model is capable of representing arbitrarily complex data structures by means of nested and recursively defined graphs , while the Hyperlog language is computationally complete. By requiring only a very small numbe...

A theory of natural language production (speaker mode) has to answer the following questions: (i) Where does the content serving as input to language production come from? (ii) In which format is this relatively language-independent content stored, processed, and retrieved? and (iii) How is activated content mapped into well-formed surfaces of a certain natural language? After brief answers to ...

To write technically correct SQL queries is a complex and skill requiring task especially for a novel user. This situation becomes more complex when a low skilled person has to use a database management system for a specific business purpose. S/He has to write some quires at his own and perform various tasks. This scenario requires more expertise and skills in terms of understanding and writing...

BABEL is a joint European project under the COPERNICUS scheme (Project #1304) comprising partners from five Eastern European countries and three Western ones. The project is producing a multi-language database of five of the most widelydiffering Eastern European languages. The collection and formatting of the data conforms to the protocols established by the ESPRIT SAM project and the resulting...

The application described in this paper is intended to facilitate web access to lexical information for Chinese and English. A Visual Basic application connects front-end HTML forms with a back-end object-oriented database implemented using LPA Prolog++. The three main components of the application are (1) the back-end database for storing lexical information; (2) a Web Client application for f...

ion mechanism. Many database researchers have used OSFOL to view the Relational Data Model (RDM) ; however, no RDM has been modelled by MSFOL. This paper first gives a formal definition for MSFOL and then its advantages of expressiveness and of abstraction are illustrated. Two reduction algorithms which can transform an MSFOL-based language into\from an OSFOL-based language are given. The seman...

This paper deals with a natural language dialogue tool for supporting the database design process. We want to illustrate how natural language (German) can be used for obtaining a skeleton design and for supporting the acquisition of semantics of the prospective database. The approach is based on the assumption that verbs form a central part in defining the meaning of sentences and imply semanti...

The intent of this paper is to show some aspects of a computer dictionary geared towards the natural language component of an expert system. The dictionary is organized as a database to integrate tile various aspects of lexicographic work and, at the same time, enable fast access from a parser. Work on the lexicon was long neglected both in theoretical linguistics and natural language processin...