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One important technique for reasoning about query containment in the context of bag semantics is to translate the queries to alternatives using aggregate functions and assuming set semantics. Bag Semantics Chaudhuri& Vardi–1993 Optimization of Real Conjunctive Queries Called for a re-examination of conjunctive-query optimization under bag semantics. In particular, they initiated the study of the containment problem for conjunctive queries containment under bag semantics. We show that bag semantics makes conjunctive query answering in OBDA coNP-hard in data complexity. To regain tractability, we consider a rather general class of queries and show its rewritability to a generalisation of the relational calculus to bags. READ FULL TEXT VIEW PDF A bag is a multi-set, a set that potentially contains multiple copies of the same tuple (depending on the schema).

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Bowerbags™ are an all-in-one modular carrying system, backpack, messenger bag, shoulder bag and more. Save money and design yours to fit your lifestyle. Semantics: the meaning of those expressions, statements, and program units. • Syntax of Java's while statement: while ( boolean_expr ) statement. Semantics: If   18 Jul 2019 Helpful resources for your journey with artificial intelligence; videos, articles, techniques, courses, profiles, and tools. Much of this is represented as semantic information or general knowledge.

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The element is used to describe a list of values that do not have to be in a specific  Our Products. Pneumatic conveying system · Rotary Valves · storage silos · Bin Vent Filter · Bag Slitting Machines. Our Systems. Container Filling · Batch Plants  and bag-semantics, as well as query processing with access control notion of certain answers for set [37] and bag [24] semantics.

Lei Wu, Steven C.H. Hoi, and Nenghai Yu. Abstract—The Bag-of-Words (BoW) model is a  The bag-of-words model is a simplifying representation used in natural language processing Part-of-speech tagging · Semantic similarity · Sentiment analysis · Stemming · Terminology extraction · Text A variation of bag semantics called bag-set semantics is obtained by requiring source relations to be sets, while allowing views and query answers to contain  The Bag-of-Words (BoW) model is a promising image representation technique for image One critical limitation of existing BoW models is that much semantic  Bag Of Words Models, Semantic Gap, Distance Metric Learning, Object Codebook, Image Annotation, Object Recognition, Multimedia And Graphics, IEEE Multi  Answer to 2. Set vs. Multiset Semantics SQL, by default, uses multiset (bag) semantics, whereas the pure relational model is set s The six collection classes are Set, SetHash, Bag, BagHash, Mix and MixHash. They all share similar semantics. In a nutshell, these classes hold, in general,  Traditional Search Principles Bag-of-words principle User need: Machine understands document Christmas tree as a set of word frequencies.
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The bag semantics we consider in this article generalises the bag-set semantics, and restricting ourselves to bag-set semantics would not change any of our results. bag semantics makes conjunctive query answering in OBDA CONP-hard in data complexity. To regain tractability, we consider a rather general class of queries and show its rewritability to a generalisa-tion of the relational calculus to bags. 1 Introduction Ontology-based data access (OBDA) is an increasingly popu- In particular, SQL queries are evaluated under bag semantics and return multisets as answers, since duplicates are not eliminated unless explicitly requested.
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e <- new.env() e$a <- FALSE complete name. partial name. copy-on-modify semantics Semantic versioning. Advanced R  satisfactory account of meaning relations on the semantic and pragmatic levels.

The.NET collections framework lacks an IBag interface, hence you have to emulate it with an IList. bag semantics; People. Names.