Semantic Web Design Patterns - Introduction - Cambridge Semantics. Introduction Linked Data Patterns book.
This free book is available online, as as PDF, and an Ebook. The articles will pick out some of the more useful patterns from the book that address commonly encountered problems. Prerequisites Today's Lesson Like a question on Stack Overflow, a design pattern is often posed as a question: how do we solve some design problem? 6. Administration. This section explains the use of the server executables, configuration files and general administration procedures.
These include backup, server tuning and profiling, installing extension packages etc. See the Access Interfaces chapter for a discussion of the command line SQL interface. 6. Administration. This section describes how to administer the Virtuoso server from the Conductor interface. It primarily allow users to administer the server while giving access to many of the features that Virtuoso has to offer providing many conceptual demonstrations and introductions. Most of the pages from the administration interface are provided to help administrators quickly and easily tune the Virtuoso server or navigate the various interfaces and features that Virtuoso has to offer. The Main Navigation Bar provides different tabs that allow you to administrate your Virtuoso server or use one of the provided samples.
From "System Admin" you can view and change the Conductor Dashboard, manage user accounts; scheduler; Virtuoso Server parameter and Access Control Settings. You can also install /upgrade /uninstall Virtuoso packages and Monitor Virtuoso Server Statistics. From "XML" you can query Relational and XML Data using SQL, XQUERY, XPATH, and FREE TEXT. Using Virtuoso Open-Source Edition on Windows. Building Virtuoso on Windows requires some time and the user should be proficient with Windows software development.
The build is not guaranteed to succeed out of the box. Unless you plan to actually modify the Virtuoso code, we recommend using the binary distribution. Getting Started with the VOS Binary Distribution for Windows Prerequisites Appropriate environment variables should be set before any of the steps below -- Determine the root location for your Virtuoso installation. Basic Installation Simply unzip the binary distribution zip file to your chosen location (see Prerequisites, above). Bin lib hosting database vad vsp. RDB2RDF Working Group. This charter is now obsolete, has been superceded by the renewed group charter.
The mission of the RDB2RDF Working Group, part of the Semantic Web Activity, is to standardize a language for mapping relational data and relational database schemas into RDF and OWL, tentatively called the RDB2RDF Mapping Language, R2RML. From the beginning of the deployment of the Semantic Web there has been increasing interest in mapping relational data to the Semantic Web. This is to allow relational data to be combined with other data on the Web, to link semantics directly to relational data and to aid in enterprise data integration. In October 2007 the W3C organized a workshop on RDF Access to Relational Databases. Tutorial de Triplificação (PUC-Rio) Autor: Percy Rivera O seguinte tutorial describe como realizar a disponibilização dos dados de banco de dados relacionais (RDB) em Triplas RDF atraves de mapeamentos realizados por ferramentas de Triplicação (e.g.
FOAF Vocabulary Specification. Classes Class: foaf:Agent Agent - An agent (eg. person, group, software or physical artifact).
The D2RQ Mapping Language. 1.
Introduction # The D2RQ Mapping Language is a declarative language for describing the relation between a relational database schema and RDFS vocabularies or OWL ontologies. A D2RQ mapping is itself an RDF document written in Turtle syntax. Generate-mapping: Auto-generating D2RQ mapping files. The generate-mapping tool creates a D2RQ mapping file by analyzing the schema of an existing database.
This mapping file, called the default mapping, maps each table to a new RDFS class that is based on the table's name, and maps each column to a property based on the column's name. This mapping file can be used as-is or can be customized. Usage # generate-mapping [-u user] [-p password] [-d driver] [-l script.sql] [--[skip-](schemas|tables|columns) list] [--w3c] [-v] [-b baseURI] [-o outfile.ttl] [--verbose] [--debug] jdbcURL Connection parameters # jdbcURL # JDBC connection URL for the database. 17 - 19 de setembro - Recife/PE - Brasil. 5º Seminário de Pesquisas em Ontologias do Brasil 7º International Workshop on Metamodels, Ontologies, Semantic Technologies Em conjunto com : 1st Workshop on Semantic Web and Amazonian Biodiversity Ontology Ontologia é uma área multidisciplinar que estuda teorias utilizadas na representação de conceitualizações compartilhadas em domínios específicos.
Virtuoso SPARQL Query Editor. OpenLink Virtuoso Universal Server: Documentation. Tutorial básico do Protege. SPARQL 1.1 Federated Query. Abstract RDF is a directed, labeled graph data format for representing information in the Web.
SPARQL can be used to express queries across diverse data sources, whether the data is stored natively as RDF or viewed as RDF via middleware. This specification defines the syntax and semantics of SPARQL 1.1 Federated Query extension for executing queries distributed over different SPARQL endpoints. The SERVICE keyword extends SPARQL 1.1 to support queries that merge data distributed across the Web. Resource Description Framework - Introduction to ontologies and semantic web - tutorial. Resource Description Framework (RDF) is a framework for representing information about resources in a graph form.
Since it was primarily intended for representing metadata about WWW resources, it is built around resources with URI. Information is represented by triples subject-predicate-object in RDF. An example of a triple is shown in the figure below. It says that "Joe Smith has homepage All elements of this triple are resources defined by URI. FOAF Vocabulary Specification. Classes Class: foaf:Agent Agent - An agent (eg. person, group, software or physical artifact). The Semantic Web.
Web Ontology Language. The OWL family contains many species, serializations, syntaxes and specifications with similar names. OWL and OWL2 are used to refer to the 2004 and 2009 specifications, respectively. Full species names will be used, including specification version (for example, OWL2 EL). When referring more generally, OWL Family will be used. History[edit] Early ontology languages[edit] Semantic Web. Semantic Web Architecture - Introduction to ontologies and semantic web - tutorial. The architecture of semantic web is illustrated in the figure below. The first layer, URI and Unicode, follows the important features of the existing WWW. Unicode is a standard of encoding international character sets and it allows that all human languages can be used (written and read) on the web using one standardized form. Uniform Resource Identifier (URI) is a string of a standardized form that allows to uniquely identify resources (e.g., documents).
A subset of URI is Uniform Resource Locator (URL), which contains access mechanism and a (network) location of a document - such as Another subset of URI is URN that allows to identify a resource without implying its location and means of dereferencing it - an example is urn:isbn:0-123-45678-9. The usage of URI is important for a distributed internet system as it provides understandable identification of all resources. OWL Web Ontology Language Reference. W3C Recommendation 10 February 2004 New Version Available: OWL 2 (Document Status Update, 12 November 2009) The OWL Working Group has produced a W3C Recommendation for a new version of OWL which adds features to this 2004 version, while remaining compatible.
Please see OWL 2 Document Overview for an introduction to OWL 2 and a guide to the OWL 2 document set. Semantic Web Standards. DCMI Home: Dublin Core® Metadata Initiative (DCMI) Becker-etal-LDIF-SemTechSanFrancisco. Linked Data. Linked / Open Data. Linked data. Linked data. Business Models for Linked Data.