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OLAP tools divide concepts based on whether they are used as analysis dimensions, or are the fact subject of analysis, which gives rise to star shape schemas. Operations are always provided to navigate inside such star schemas. However, the navigation among different stars is usually overlooked. This paper studies different kinds of Object-Oriented(More)
In the last years, lots of work have been devoted to multidimensional modeling, star shape schemas and OLAP operations. However, "drill-across" has not captured as much attention as other operations. This operation allows to change the subject of analysis keeping the same analysis space we were using to analyze another subject. It is assumed that this can(More)
The words On Line Analytical Processing bring together a set of tools that use multidimensional modeling in the management of information to improve the decision making process Lately a lot of work has been devoted to modeling the multidimensional space The aim of this paper is twofold On one hand it compiles and classi es some of that work with regard to(More)
This paper presents a multidimensional conceptual Object-Oriented model, its structures, integrity constraints and query operations. It has been developed as an extension of UML core metaclasses to facilitate its usage, as well as to avoid the introduction of completely new concepts. YAM2 allows the representation of several semantically related star(More)
In this paper we try to outline the goodness of using an O O model on designing multidimensional Data Marts We argue that mul tidimensional modeling is lacking in semantics which can be obtained by using the O O paradigm Some bene ts that could be obtained by doing this are classi ed in six O O Dimensions i e Classi cation Ins tantiation Generalization(More)
"On-Line Analytical Processing" tools are used to extract information from the "Data Warehouse" in order to help in the decision making process. These tools are based on multidimensional concepts, i.e. facts and dimensions. In this paper we study the meaning of facts, and the dependencies in multidimensional data. This study is used to find relationships(More)
In this paper, FLERSA (Flexible Range Semantic Annotation) is presented as a user-centred annotation tool for Web content. The tool has been developed over a CMS and allows both manual and automatic semantic annotations. For manual annotation, a new flexible range markup technique is used, based on the RDFa standard, to support the evolution of annotated(More)