Sökning: "RDF view"

Hittade 5 avhandlingar innehållade orden RDF view.

1. 1. Querying RDF Schema Views of Relational Databases

   Författare :Johan Petrini; Tore Risch; Larry Kerschberg; Uppsala universitet; []
   Nyckelord :query processing; partial evaluation; rdf; rdf schema; view; relational databases; semantic web;

   Sammanfattning : The amount of data found on the web today and its lack of semantics makes it increasingly harder to retrieve a particular piece of information. With the Resource Description Framework (RDF) every piece of information can be annotated with properties describing its semantics. LÄS MER

3. 2. Scalable Preservation, Reconstruction, and Querying of Databases in terms of Semantic Web Representations

   Författare :Silvia Stefanova; Tore Risch; Stefan Decker; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; RDF; RDFS; RDF view; SPARQL; SPARQL query processing; rewrite optimization; Topic Maps; querying of RDF views; archive relational databases; reconstruct archived databases; Datavetenskap med inriktning mot databasteknik; Computer Science with specialization in Database Technology;

   Sammanfattning : This Thesis addresses how Semantic Web representations, in particular RDF, can enable flexible and scalable preservation, recreation, and querying of databases.An approach has been developed for selective scalable long-term archival of relational databases (RDBs) as RDF, implemented in the SAQ (Semantic Archive and Query) system. LÄS MER

4. 3. Flexible Authoring of Metadata for Learning : Assembling forms from a declarative data and view model

   Författare :Fredrik Enoksson; Olle Bälter; Ambjörn Naeve; Pawlowski Jan; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Metadata; RDF; Semantic Web; metadata editors; metadata authoring; Computer science; Datavetenskap;

   Sammanfattning : With the vast amount of information in various formats that is produced today it becomes necessary for consumers ofthis information to be able to judge if it is relevant for them. One way to enable that is to provide information abouteach piece of information, i.e. provide metadata. LÄS MER

5. 4. A Uniform Query Processing Approach for Integrating Data from Heterogeneous Resources

   Författare :Merja Karjalainen; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Query processing; Functional data model; Rewrite rules; Data integration;

   Sammanfattning : Scientists who need to explore several different databases in theirresearch can find it difficult and tedious to extract and combineinformation from various heterogeneous data sources manually.This is a particular problem for researchers in the life sciences,since technical advances in the last decade have resulted in a dramaticincrease in the quantity and variety of data. LÄS MER

7. 5. Diversified Retrieval of Spatial Data with Context

   Författare :Georgios Kalamatianos; Georgios J Fakas; Aristides Gionis; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Proportionality; Diversity; Keyword Search; Spatial Data; Ranking; Computer Science; Datavetenskap;

   Sammanfattning : The abundance and ubiquity of spatial datasets necessitates their effective and efficient retrieval. For instance, on the web, there are datasets with GIS objects or POIs (e.g. Spatialhadoop datasets), datasets with geo-tagged photographs (e. LÄS MER