Data Models in DBMS TheData Modelis defined as an abstract model that organizes data description, data semantics, and consistency constraints of data. The data model emphasizes on what data is needed and how it should be organized instead of what operations will be performed on data. Data Model...
The appropriate support and retrieval services to enable inference and retrieval tasks over scientific data sets semantics is developed. The conceptualization of the subject domain including the development of the vocabulary is performed using RDF model and schema constructs. The notion of a semantic ...
shouldbewelldefinedsothatchangesinsomepartsdonotseriouslyinfluenceothers.DataModels nAcollectionoftoolsfordescribinglDatalDatarelationshipslDatasemanticslDataconstraints nRelationalmodelnEntity-Relationshipdatamodel(mainlyfordatabasedesign)nObject-baseddatamodels(Object-orientedandObject-relational)nSemistructureddatamodel...
on the description of the Gaea kernel, specifically the portion of the metadata manager that involves the management of the semantics of derived data. Meta... Y Zhang,MO Ward,NI Hachem,... - CiteSeer 被引量: 6发表: 1993年 Managing Derived Data in Gaea Scientific DBMS Managing Derived Data...
changingthelogicalschemaApplicationsdependonthelogicalschemaIngeneral,theinterfacesbetweenthevariouslevelsandcomponentsshouldbewelldefinedsothatchangesinsomepartsdonotseriouslyinfluenceothers.DataModelsAcollectionoftoolsfordescribingDataDatarelationshipsDatasemanticsDataconstraintsRelationalmodelEntity-Relationshipdatamodel(mainly...
再次强调syntax-correct和semantics-aware这两点。 Generatiing Syntax-Correct Queries 使用IR来表示SQL queries 好处: structual and informative way; 每个IR只有两个operands,操作起来简易 每个IR statement都有一个grammar type,比如SelectStmt 剥离每个IR上面的具体数值,比如table names,聚焦于变异语法骨架 ...
That has motivated the development of the collaborative data sharing system (CDSS), which builds upon data integration techniques to provide a principled semantics for exchanging data and updates among autonomous sites. The CDSS models the exchange of data among sites asupdate propagation among peers,...
A man-machine interface in natural language for a DataBase Management System (DBMS) called VORAS, based upon semantics, is presented. This DBMS can also be used for knowledge representation, and is well-suited to the design of queries in natural language. The system VORAS is an object-oriente...
6、oad assistant. Data upload process is styled in analogy to eBay sales upload assistant,Internal Semantics,SDDB metadata are held in a fully normalised relational database. SDDB metadata are fully browseable to allow iterative search. SDDB has (so far) no full-text search,Projects and Expedi...
H Wang,Q Liu,T Penin,... - 《Web Semantics Science Services & Agents on the World Wide Web》 被引量: 147发表: 2009年 From Browsing to Interacting: DBMS Support for Responive Websites (Abstract) Internet websites increasingly rely on database management systems. There are several reasons ...