The management of spatial data in relational databases provides a number of advantages compared to traditional (separated) approaches where geometry and metadata are kept in file systems as opposed to alphanumeric data that reside in relational databases. Above all relational databases ensure efficient spatial data management by providing multi-user support and better control of spatial data qu...

Richly interlinked, machine-understandable data constitutes the basis for the Semantic Web. Annotating web documents is one of the major techniques for creating metadata on the Web. However, annotation tools so far are restricted in their capabilities of providing richly interlinked and truely machine-understandable data. They basically allow the user to annotate with plain text according to a ...

Resource Description Framework (RDF) is a standard for representing information that can be identified using a Universal Resource Identifier. In particular, it is intended for representing metadata about Web resources. RDF is being used in numerous application areas, including Life Sciences, Digital Libraries, and Intelligence. The RDF data structure is a directed graph or network. Current solu...

This paper surveys a class of computer architectures that use parallelism to enhance the performance of relational database systems. These architectures are referred to as Database Machines (DBMs). This survey groups the database machines into a small number of classes according to a newly developed classification scheme. The classes are then reviewed, examined, and compared in light of current...