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In the last years, Linked Data initiatives have encouraged the publication of large graph-structured datasets using the Resource Description Framework (RDF). Due to the constant growth of RDF data on the web, more flexible data management infrastructures must be able to efficiently and effectively exploit the vast amount of knowledge accessible on the web. This book presents flexible query processing strategies over RDF graphs on the web using the SPARQL query language. In this work, we show how query engines can change plans on-the-fly with adaptive techniques to cope with unpredictable conditions and to reduce execution time. Furthermore, this work investigates the application of crowdsourcing in query processing, where engines are able to contact humans to enhance the quality of query answers. The theoretical and empirical results presented in this book indicate that flexible techniques allow for querying RDF data sources efficiently and effectively.
A father's love. A family's tragedy. A daughter's revenge. Honor student Emma knows more about galvanic cell diagrams than guns. College is the only way out of her gang-ridden hometown, but her parents can't afford it. When her unemployed dad lands a job as a census taker, things start looking up. But he's sent deep into East Malo Verde, where gang members rule the streets and fear anyone with a badge who knocks on doors. One night, a gang member mistakes him for a cop and beats him savagely, leaving him for dead. Her best friends, her chem lab partner, her mom, and the detective assigned to the case all try to convince her to focus on school. But school won't prepare her for a world that ignores a crime against a good man. Emma must decide what's more important: doing what's expected, or doing what she feels is right . . . even if it leads her down a dark and dangerous path of revenge. The Red Road is about a girl in turmoil, coming of age as she discovers the depths - and the limits - of friendship, first love, and the bond between parents and their children. Subjects: contemporary literature, literary fiction, psychological fiction, family drama