Cristian Pérez de Laborda

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One of the research fields which has recently gained much scientific interest within the database community are Peer-to-Peer databases, where peers have the autonomy to decide whether to join or to leave an information sharing environment at any time. Such volatile data nodes may appear shortly, collect or deliver some data, and disappear again. It even can(More)
Despite all the efforts to build up a Semantic Web, where each machine can understand and interpret the data it processes, information is usually still stored in ordinary relational databases. Semantic Web applications needing access to such semantically unexploited data, have to create their own manual relational database to Semantic Web mappings. In this(More)
Although there have been standardization efforts for more than ten years, heterogeneity of business process modelling schemas is still a big problem for business process management. This paper discusses the applicability of schema integration methodology in this context and illustrates specific integration problems by discussing the example of BPEL and(More)
In this paper we suggest the novel URI scheme db for identifying not only databases, but also their schema and data components like tables or columns. One of the features of this scheme is that it may not only be used for relational database systems, but for virtually any type of database or data source. We therefore have combined the advantages of both(More)
Sharing information in loosely coupled enterprises or virtual corporations demands a flexible and dynamic architecture, suitable for their individual data policies. The aim of this paper is to present the D́ıgame architecture, which balances both, local autonomy and a reasonable degree of information sharing. Therefore we combine the well known concept of(More)
One of the main drawbacks of the Semantic Web is the lack of semantically rich data, since most of the information is still stored in relational databases. We present RDQuery, a wrapper system which enables Semantic Web applications to access and query data actually stored in relational databases using their own built-in functionality. RDQuery automatically(More)
Collaborative work requires, more than ever, access to data located on multiple autonomous and heterogeneous data sources. The development of these novel information platforms, referred to as information or data grids, and the evolving databases based on P2P concepts, need appropriate modeling and description mechanisms. In this paper we propose the Link(More)
Originally developed for file sharing, P2P concepts are predestinated to realize information sharing in a more general way. Combined with the well known concept of loosely coupled multidatabases they provide a promising fundament for sharing data and metadata across autonomous and heterogenous data sources. The D́ıgame architecture allows each participating(More)