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IJCSMC, 2019
The semantic web gives a common framework that enables data to be shared and reused crosswise communities and applications. Semantic web depends on Resource Description Framework (RDF) graph data model, which is a standard model for data interchange on the web. Therefore, the success of the semantic web mainly relies upon the good creation of RDF. A powerful representation formalism for both structured and unstructured data are graphs that can be seen as a unified data representation. Also the development of the semantic web requires accessing large quantities of data stored in relational databases (RDB). Making data hosted in RDB machine understandable to the semantic web has been an active field of research during the last decade. Some of graph models that are used for representing an RDF succeed to solve some problems like blank nodes, reification, and answering queries posed by users and software agents, but fails in other problems like semantic reasoning and RDF query evaluation techniques. Also in the area of representing RDB as RDF graph data model none of these models defined a formal model for RDF graph model. Some database features like the normalization, function dependency, and query optimization does not address in the current graph representations. The purpose of this study is to present the important contributions that have been produced in the area of representing RDF as graph and hypergraph data model. Two models for representing relational database as an RDF graph data model are also reviewed.
Formalizing an RDF abstract graph model to be compatible with the RDF formal semantics has remained one of the foundational problems in the Semantic Web. In this paper, we propose a new formal graph model for RDF datasets. This model allows us to express the current model-theoretic semantics in the form of a graph. We also propose the concepts of resource path and triple path as well as an algorithm for traversing the new graph. We demonstrate the feasibility of this graph model through two implementations: one is a new graph engine called GraphKE, and the other is extended from RDF-3X to show that existing systems can also benefit from this model. In order to evaluate the empirical aspect of our graph model, we choose the shortest path algorithm and implement it in the GraphKE and the RDF-3X. Our experiments on both engines for finding the shortest paths in the YAGO2S-SP dataset give decent performance in terms of execution time. The empirical results show that our graph model with well-defined semantics can be effectively implemented.
AAAI Spring Symposium Series, 2010
2003
Abstract RDF is the first W3C standard for enriching information resources of the Web with detailed meta data. The semantics of RDF data is defined using a RDF schema. The most expressive language for querying RDF is RQL, which enables querying of semantics. In order to support RQL, a RDF storage system has to map the RDF graph model onto its storage structure. Several storage systems for RDF data have been developed, which store the RDF data as triples in a relational database.
2024
Baseado na investigação de um processo inquisitorial, François Soyer faz-nos um relato biográfico e vívido de Maria Duran, desde a fuga do seu casamento com um homem, na Catalunha, até à sua passagem pelo Sul de França, e por Barcelona, onde virá a integrar o exército espanhol como soldado. Posteriormente viaja para Portugal, onde, como mulher, dará entrada em sucessivas casas de recolhidas em instituições eclesiásticas para mulheres. Com uma personalidade complexa, seduz diversas freiras e recolhidas, é acusada de ser um homem e de se fazer passar por mulher num contexto conventual e de ter tratos com o Diabo. Um percurso por várias organizações conventuais leva-a a Évora, onde após novas aventuras será finalmente detida pela Inquisição. O Santo Ofício reuniu vários médicos, cirurgiões e parteiras para realizar exames minuciosos ao corpo de Maria, e em particular aos seus órgãos sexuais. Os relatórios e discussões dos inquisidores oferecem relatos fascinantes das atitudes em relação ao sexo e género na Europa do início da era moderna. Com base nos extensos arquivos do julgamento, o autor utiliza a história de Maria para trazer novas perspetivas sobre aspetos da vida muito raramente registados em documentos do início da era moderna: a transgressão das normas de género, sexualidade transgressora e a violência sexual em instituições religiosas femininas, para além dos medos e debates sobre o poder que o Diabo poderia exercer sobre o corpo humano. E tudo isto num contexto português.
Journal of British Studies, 2024
A review of Philip MacDougall 'The Great Anglo-Russian Naval Alliance of the Eighteenth Century and Beyond'
2020
Gocemos y meditemos esta sublime Enseñanza para que nuestra plegaria, a partir de hoy, brille como Dios la desea y espera.
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