The “Cube-Query-Language” (CQL) is a new query language forjexible access to Multidimensional Database Systems. CQL provides a high level user intelface for specifying queries in the context of multidimensional data analysis. The multidimensional view is widely accepted for typical decision support requirements like “Online Analytical Processing “. CQL directly supports this view and circumvent...

We report on a community e‚ort between industry and academia to shape the future of graph query languages. We argue that existing graph database management systems should consider supporting a query language with two key characteristics. First, it should be composable, meaning, that graphs are the input and the output of queries. Second, the graph query language should treat paths as €rst-class...

Creating an innovative mediator environment such as graphical user interfaces, lighter weight languages to help the users in the challenging task of making unambiguous requests is crucial in semantic web applications. The query language in the Virtual Query System (VQS) of the SemanticLIFE framework is designed for this purpose. The proposed query language namely Virtual Query Language (VQL) is...

This thesis presents strategies to improve the query evaluation performance over huge volumes of relational-like data that is stored in the memory space of managed applications. Storing and processing application data in the memory space of managed applications is motivated by the convergence of two recent trends in data management. First, dropping DRAM prices have led to memory capacities that...

Spatial data mining is a process used to discover interesting but not explicitly available, highly usable patterns embedded in both spatial and nonspatial data, which are possibly stored in a spatial database. An important application of spatial data mining methods is the extraction of knowledge from a Geographic Information System (GIS). INGENS (INductive GEographic iNformation System) is a pr...

The study of node-selection query languages for (finite) trees has been a major topic in the recent research on query languages for Web documents. On one hand, there has been an extensive study of XPath and its various extensions. On the other hand, query languages based on classical logics, such as first-order logic (FO) or monadic second-order logic (MSO), have been considered. Results in thi...

The World Wide Web Consortium has convened a working group to design a query language for Extensible Markup Language (XML) data sources. This new query language, called XQuery, is still evolving and has been described in a series of drafts published by the working group. XQuery is a functional language comprised of several kinds of expressions that can be nested and composed with full generalit...

OntoVQL: Ontology Visual Query Language Amineh Fadhil Applying visual techniques to access data has been a successful way of abstracting and simplifying the complexity of the operation to a user not versed in the technical domain. Visual querying systems have been developed to represent a database schema and to visually query its content. Similar effort has been done for visually representing t...

The structure of aX GLquery consists of two parts: one querying and one constructing XML data graphs. The querying part is defined by means of a simplified form of graph grammar, which is made user-friendly by adding some syntactic simplifications to standard graph grammars. The constructing part is defined by a graph which describes the structure and the content of the document which has to be...

We propose a modal query language called MDatalog. A rule of an MDatalog program is a universally quantified modal Horn clause. This language is interpreted in fixed-domain first-order modal logics over signatures without functions. We give algorithms to construct the least models for MDatalog programs. We show PTIME complexity of computing queries for a given MDatalog program in the logics KD,...