Despite the large number of Natural Language Interfaces to Databases (NLIDB) that have been implemented, they do not guarantee to provide a correct response in 100% of the queries. In this paper, we present a way of semantic modelling the elements that integrate the knowledge of a NLIDB with the aim of increasing the number of correctly-answered queries. We design semantic representations in or...

Data Warehouses and statistical databases (Shoshani 1997) contain both numerical attributes (measures) and categorical attributes (dimensions). These data are often stored within a relational database with an associated hierarchical structure. There are few algorithms to date that explicitly exploit this hierarchical structure when carrying out knowledge discovery on such data. We look at a num...

This paper investigates the idea of supporting metadata querying and restructuring using extensions of the SQL:1999 facilities for integrity constraints and active databases. Our approach involves associating meta-functionality with federation relations by means of constraints, assertions, and triggers. This approach can underpin recent work on dynamic interoperability in relational federations...

The paper presents an original algorithm for automatic mapping of relational databases to MongoDB NoSQL databases. The algorithm uses the metadata stored in the relational system tables. It takes into consideration the concepts from Entity-Relationship (ER) model: entity type represented by a relation in the Relational Model (RM), 1:1 and 1:M relationship type represented with Foreign Keys (FK)...

This paper will discuss how a forensic comparison tool can effectively assist in a forensic investigation of the metadata and data of a database installation, and an approach to handle the output of the forensic comparison tool in a forensic investigation. The metadata of a psql DBMS installation was compromised to support this statement. The relational database management system was divided in...

New requirements are arising in environments where we have higher volumes of data with high operation rates, agile development and cloud computing. In recent years, a growing number of companies have adopted various types of nonrelational database, commonly referred to as NoSQL database. This reflects the growing interactivity of applications which are becoming more networked and social, drivin...

[1] Environmental observations are fundamental to hydrology and water resources, and the way these data are organized and manipulated either enables or inhibits the analyses that can be performed. The Observations Data Model presented here provides a new and consistent format for the storage and retrieval of point environmental observations in a relational database designed to facilitate integr...

The F́ıschlár system provides a large centralised repository of multimedia files. As expansion is difficult in centralised systems and as different user groups have a requirement to define their own schemas, the EGTV (Efficient Global Transactions for Video) project was established to examine how the distribution of this database could be managed. The federated database approach is advocated whe...

Digital television (digiTV) is an additional multimedia environment, where metadata is one key element for the description of arbitrary content. This implies adequate structures for content description, which is provided by XML metadata schemes (e.g. MPEG-7, MPEG-21). Content and metadata management is the task of a multimedia repository, from which digiTV clients equipped with an Internet conn...

Edutella is an RDF-based E-Learning P2P network that is aimed to accommodate heterogeneous learning resource metadata repositories in a P2P manner and further facilitate the exchange of metadata between these repositories based on RDF. Whereas Edutella provides RDF metadata repositories with a quite natural integration approach, XML metadata repositories have to overcome considerable incompatib...