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Relational Databases in RDF: Keys and Foreign Keys [chapter]

Georg Lausen
Lecture Notes in Computer Science  
In this paper, we discuss several possible ways to map relational databases into an RDF graph.  ...  We discuss the problem of how to represent the original key and foreign key constraints in the resulting RDF graph and demonstrate, that different kinds of mappings require different solutions.  ...  I wish to thank Wolfgang May and Michael Schmidt for their insightful comments on this paper.  ... 
doi:10.1007/978-3-540-70960-2_3 fatcat:voseagwswrhzhpeyljbekxlcuy

Sparql query processing in relational databases

Ju Ri Kim, Zhanfang Zhao, Sung Kook Han
2018 International Journal of Engineering & Technology  
Both the relationships in ER model and predicates in RDF model describe the relations between things.Since RDB and RDF share the similar modeling approach at the schema level, it is reasonable that mapping  ...  This paper shows how to implement SPARQL endpoint in RDB using a conceptual level mapping approach.Methods/Statistical analysis: Many diverse approaches and related languages for mapping RDB to RDF have  ...  Entity predicates are the ordinary column names in relational table, which are neither primary key nor foreign key such as "name", "age" and "phone".  Self-Link Predicate.  ... 
doi:10.14419/ijet.v7i2.33.13860 fatcat:xoolr2gxdjfhvpka4wjrbzerj4

SPARQLing constraints for RDF

Georg Lausen, Michael Meier, Michael Schmidt
2008 Proceedings of the 11th international conference on Extending database technology Advances in database technology - EDBT '08  
In contrast to relational databases, where data relationships are implicitly given by schema information as well as primary and foreign key constraints, relationships in semantic markup languages are made  ...  As an improvement over existing approaches, our scheme allows for translating conventional databases into RDF without losing general constraints and vital key information.  ...  RELATED WORK Relational Databases and RDF. Relational databases are typically used in the context of RDF as a back end to store the RDF-statements, e.g. in Jena [14] and Sesame [28] .  ... 
doi:10.1145/1352431.1352492 fatcat:jeslpc6xpnbdjhtvpo7d6x5aca

SPARQLing constraints for RDF

Georg Lausen, Michael Meier, Michael Schmidt
2008 Proceedings of the 11th international conference on Extending database technology Advances in database technology - EDBT '08  
In contrast to relational databases, where data relationships are implicitly given by schema information as well as primary and foreign key constraints, relationships in semantic markup languages are made  ...  As an improvement over existing approaches, our scheme allows for translating conventional databases into RDF without losing general constraints and vital key information.  ...  RELATED WORK Relational Databases and RDF. Relational databases are typically used in the context of RDF as a back end to store the RDF-statements, e.g. in Jena [14] and Sesame [28] .  ... 
doi:10.1145/1353343.1353404 dblp:conf/edbt/LausenMS08 fatcat:njfbgiusrzb2ziognbnijqin4a

Relational Databases as Semantic Web Endpoints [chapter]

Matthias Hert
2009 Lecture Notes in Computer Science  
This proposal explores the promotion of existing relational databases to Semantic Web Endpoints.  ...  It presents the benefits of ontology-based read and write access to existing relational data as well as the need for specialized, scalable reasoning over that data.  ...  (e.g. primary keys, foreign key relationships, etc.).  ... 
doi:10.1007/978-3-642-02121-3_84 fatcat:mncx3ldjvfc5nbtajfrbe6migi

On-demand RDF to relational query translation in Samizdat RDF store

Dmitry Borodaenko
2009 2009 IEEE International Conference on Intelligent Computing and Intelligent Systems  
Query capabilities implemented by the algorithm include optional and negative graph patterns, nested sub-patterns, and limited RDFS and OWL inference backed by database triggers.  ...  and arbitrary RDF triples with a performance comparable to that of relational systems.  ...  The adaptation process involves adding attributes, foreign keys, tables, and triggers to the database to enable RDF query translation and support optional features of Samizdat RDF store, such as statement  ... 
doi:10.1109/icicisys.2009.5358140 fatcat:zecmmiqh7fahdhj5glm4tgt5ju

Accessing and Documenting Relational Databases through OWL Ontologies [chapter]

Carlo Curino, Giorgio Orsi, Emanuele Panigati, Letizia Tanca
2009 Lecture Notes in Computer Science  
Relational databases have been designed to store high volumes of data and to provide an efficient query interface.  ...  The goal of this work is to bridge the relational and ontological worlds, in order to leverage the efficiency and scalability of relational technologies and the high level view of data and metadata proper  ...  in the Field of Science and Technology between Italy and the United States of America for the years (2008-2010).  ... 
doi:10.1007/978-3-642-04957-6_37 fatcat:w7fxmjlfjjcflf2vsfpxc5ifgq

Transformation of a Relational Database to RDF/RDFS with ER2iDM

Mi-Young CHOI, Chang-Joo MOON, Doo-Kwon BAIK
2013 IEICE transactions on information and systems  
Web using database stored data. key words: Semantic Web, relational data model, relational database, RDF/RDFS  ...  But most web data is not available in RDF/RDFS documents because most web data is still stored in databases. It is much more favorable to use stored data in a database to build the Semantic Web.  ...  The ResourcePredicate is composed of three attributes, which all are foreign keys from the Resource and Predicate.  ... 
doi:10.1587/transinf.e96.d.1478 fatcat:fjaqnvxp2jc4rnurrfar5yo3n4

Semantic query in a relational database using a local ontology construction

Saeed M. Sedighi, Reza Javidan
2012 South African Journal of Science  
Acknowledgements Competing interests We declare that we have no financial or personal relationships which may have inappropriately influenced us in writing this paper.  ...  The parent class (class-1) is defined as a range class for the related object property in order to have each foreign key value mapped to a common object property.  ...  system, making querying such data very difficult. 4 Other systems transform the ontology data into RDF form and store the RDF triples (the subject-predicate-object statements) in a relational database  ... 
doi:10.4102/sajs.v108i11/12.1107 fatcat:uqqzvzjzqrhtrpssp73wfbct34

Semantic - Based Querying Using Ontology in Relational Database of Library Management System

Ayesha Banu, Syeda Sameen Fatima, Khaleel Ur Rahman Khan
2011 International journal of Web & Semantic Technology  
The traditional Web stores huge amount of data in the form of Relational Databases (RDB) as it is good at storing objects and relationships between them.  ...  In this paper we consider the Library Management System (LMS) database, taking some tuples of the LMS Relational Schema.  ...  RDF Knowledge Modeling Table 3 : 3 A Relational Database for the Library Management System Relation Primary Key Foreign Key Book(Bid,Title,Author,Price,Status,Mid,Pid) Bid Mid ref. to Member  ... 
doi:10.5121/ijwest.2011.2402 fatcat:ssqcf4dnzzecblwi2mlnltoqgy

D2RQ Platform – Treating Non-RDF Databases as Virtual RDF Graphs

Radoslaw Oldakowski
2011 Nature Precedings  
DB into Semantic Web  What is needed • A way to map between the relational data model and RDF -Data Model heterogeneity » relations vs.  ...   Inference  Support for Named Graphs Radoslaw Oldakowski D2RQ Mapping Language Specification  Declarative language for describing the relations of a relational database schema and RDFS vocabularies  ... 
doi:10.1038/npre.2011.5660.1 fatcat:xdarzx2ca5fujcze2t7xmxsdnu

Cohabitation of Relational Databases and Domain Ontologies in the Semantic Web Context

Leila Zemmouchi-Ghomari
2018 Journal of Systems Integration  
This paper aims to bridge the gap between ontologies and databases in the context of the Semantic Web by highlighting their advantages and disadvantages, their complementarity, and the most popular means  ...  Despite the fact that database technology is mature, it is not yet compatible with Semantic Web requirements, such as Semantic Web language concordance.  ...  o Foreign key constraint: A foreign key of  ... 
doi:10.20470/jsi.v9i1.334 fatcat:2mw64w4ecbhprogngqrh5745mi

Htab2RDF: Mapping HTML Tables to RDF Triples

Djelloul Bouchiha, Mimoun Malki, Abdullah Alghamdi, Khalid Alnafjan
2017 Computing and informatics  
A significant number of Web documents include HTML tables generated dynamically from relational databases. Often, there is no direct public access to the databases themselves.  ...  To allow direct access to data on the Web as Linked Data, we propose in this paper an approach to transform HTML tables into RDF triples.  ...  A Direct Mapping from relational data to RDF has been presented in [1] . It takes as input a relational database (schema and data), and produces an RDF graph called the direct graph.  ... 
doi:10.4149/cai_2017_6_1467 fatcat:ncjdocckqrehfmb5wtngklwhj4

An Approach for Automatically Generating R2RML-Based Direct Mapping from Relational Databases [chapter]

Mohamed A. G. Hazber, Ruixuan Li, Guandong Xu, Khaled M. Alalayah
2016 Communications in Computer and Information Science  
The R2RML mapping reflects the behavior of the DM specification and allows any R2RML parser to generate a set of RDF triples from relational data.  ...  For integrating relational databases (RDBs) into semantic web applications, the W3C RDB2RDF Working Group recommended two approaches, Direct Mapping (DM) and R2RML.  ...  key (UK), and/or foreign key (FK).  ... 
doi:10.1007/978-981-10-2053-7_15 fatcat:l7hu77rxpjhgto5irhdygdnjsy

Different RDB to RDF mapping languages

Priyanka Shukla, Vaibhav Singh, Akanksha Shukla
2014 International Journal of Computer Applications Technology and Research  
and a conceptual gap is to be bridged between the Relational Database model and RDF to make this data available on web semantic.Many mapping languages and approaches have been found leading to the ongoing  ...  standardization of the World WideWeb Consortium(W3C) carried out in the RDB2RDF Working Group(WG).This paper would provide help and recommendations for selecting a mapping language.  ...  ,monotone and query preserving only when relational databases contain null values.But unfortunately we found that no monotone direct mapping is semantic preserving if foreign keys are considered.  ... 
doi:10.7753/ijcatr0306.1011 fatcat:tfciv4tijzhrfgs6nrv6kvm2su
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