tailieunhanh - Evaluation of Current RDF Database Solutions

There are two main types of brain cancer. Primary brain cancer starts in the brain. Metastatic brain cancer starts somewhere else in the body and moves to the brain. According to the American Brain Tumor Association, brain tumors are the most common of the solid tumors in children, and the second most frequent malignancy of childhood. Brain tumors are the second leading cause of cancer-related deaths in males under 40 and the second leading cause of cancer-related deaths in females under age 20. At publication, the database lists 30 studies linking pesticides to brain cancer. Researchers believe that insecticides that. | Evaluation of Current RDF Database Solutions Florian Stegmaier1 Udo Grobner1 Mario Doller1 Harald Kosch1 and Gero Baese2 1 Chair of Distributed Information Systems University of Passau Passau Germany 2 Corporate Technology Siemens AG Munich Germany Abstract. Unstructured data . digital still images is generated distributed and stored worldwide at an ever increasing rate. In order to provide efficient annotation storage and search capabilities among this data and XML based description formats data stores and query languages have been introduced. As XML lacks on expressing semantic meanings and coherences it has been enhanced by the Resource Description Format RDF and the associated query language SPARQL. In this context the paper evaluates currently existing RDF databases that support the SPARQL query language by the following means general features such as details about software producer and license information architectural comparison and efficiency comparison of the interpretation of SPARQL queries on a scalable test data set. 1 Introduction The production of unstructured data especially in the multimedia domain is overwhelming. For instance recent studies3 report that 60 of today s mobile multimedia devices equipped with an image sensor audio support and video playback have basic multimedia functionalities almost nine out of ten in the year 2011. In this context the annotation of unstructured data has become a necessity in order to increase retrieval efficiency during search. In the last couple of years the Extensible Markup Language XML 16 due to its interoperability features has become a de-facto standard as a basis for the use of description formats in various domains. In the case of multimedia there are for instance the well known MPEG-7 13 and Dublin Core 12 standards or in the domain of cultural heritage the Museumdat4 and the Categories for the Description of Works of Art CDWA Lite5 description .