background preloader

Teaching: RDF

Facebook Twitter

Google Structured Data Markup Helpers by □ Classy Schema. Position Statement: The RDF* and SPARQL* Approach to Annotate Statements in RDF and to Reconcile RDF and Property Graphs. 2 people like this post.

Position Statement: The RDF* and SPARQL* Approach to Annotate Statements in RDF and to Reconcile RDF and Property Graphs

This post presents my position statement for the W3C Workshop on Web Standardization for Graph Data. Update (April 23, 2020): In addition to the two RDF graph database systems mentioned in the blog post (Blazegraph and AnzoGraph), two more such systems have added support for RDF* and SPARQL* in the meantime; these systems are Stardog and GraphDB. Update (June 27, 2019): We now have a W3C mailing list to discuss question related to RDF* and SPARQL*. Update (June 9, 2019): In the meantime, I have defined SPARQL* Update. The lack of a convenient way to annotate RDF triples and to query such annotations has been a long standing issue for RDF. We are proposing an alternative approach that is based on nesting of RDF triples and of query patterns. The goal of this position statement is to bring the approach to the attention of the workshop attendees and to put on the workshop agenda a discussion regarding standardization opportunities for this approach.

Ending the RDF vs. Property Graph debate with RDF* - AI Business. For a long time, there were only two main types of graph databases: Resource Description Framework (RDF) and Labeled Property Graphs (LPGs).

Ending the RDF vs. Property Graph debate with RDF* - AI Business

Each of these graphs excelled at different things; you had to choose one based on your main use case and hope it didn’t change too much. RDF graphs are either triple or quad stores. Their chief benefits are interoperable standards that eliminate silos, the ease of use of their data models (ontologies), and their superior inferencing that supports machine intelligence.

The principal benefit of LPGs is the richness of detail they give data. These graphs let users quickly add properties to nodes to describe them with any assortment of additional information, like dates. Today, there’s a third graph type that combines the best of these approaches. OWL 2 Validator. Validating RDF data with SHACL. Last month, in The W3C standard constraint language for RDF: SHACL, I described the history of this new standard that lets us define constraints on RDF data and an open source tool that lets us identify where such constraints were violated.

Validating RDF data with SHACL

The presence of the standard and tools that let us implement the standard will be a big help to the use of RDF in production environments. There's a lot you can do with SHACL--enough that the full collection of features available and their infrastructure can appear a bit complicated. I wanted to create some simple constraints for some simple data and then use the shaclvalidate.sh tool to identify which parts of the data violated which constraints, and it went very nicely. Introduction to rdf schema revised 1spp. Ending the RDF vs. Property Graph debate with RDF* Graph Data Model. RDF Schema. Our solutions. The ISA² Programme has developed a number of semantic specifications and interoperability solutions which are available to public administrations, namely: the e-Government Core Vocabularies, the DCAT Application Profile for Data Portals in Europe (DCAT-AP) and the Asset Description Metadata Schema (ADMS). e-Government Core Vocabularies These are simplified, reusable, and extensible data models that capture the fundamental characteristics of an entity, such as a person or a public organisation, in a context-neutral manner.

Our solutions

Public administrations can use and extend the e-Government Core Vocabularies in the following contexts: Information exchange between systems: the Core Vocabularies can become the basis of a context-specific data model used to exchange data among existing information systems. From Taxonomies over Ontologies to Knowledge Graphs - Semantic Web Company. With the rise of linked data and the semantic web, concepts and terms like ‘ontology’, ‘vocabulary’, ‘thesaurus’ or ‘taxonomy’ are being picked up frequently by information managers, search engine specialists or data engineers to describe ‘knowledge models’ in general.

From Taxonomies over Ontologies to Knowledge Graphs - Semantic Web Company

In many cases the terms are used without any specific meaning which brings a lot of people to the basic question: What are the differences between a taxonomy, a thesaurus, an ontology and a knowledge graph? This article should bring light into this discussion by guiding you through an example which starts off from a taxonomy, introduces an ontology and finally exposes a knowledge graph (linked data graph) to be used as the basis for semantic applications. 1. Taxonomies and thesauri Taxonomies and thesauri are closely related species of controlled vocabularies to describe relations between concepts and their labels including synonyms, most often in various languages. 2. 3.

Validata: RDF Validator. RDFa 1.1 Validator. This is validator is meant to validate RDFa content in an HTML or an XML file.

RDFa 1.1 Validator

The validator does not analyze the HTML/XML content itself. It is advised to use, e.g., the separate HTML validator for that purpose. By default, the validator considers RDFa 1.1, but RDFa 1.0 is also recognized if the @version attribute is set in the source If you intend to use this service regularly on large scale, consider downloading the package and use it locally. This validator is based on the RDF 1.1 Distiller: it uses the same code base, just produces a different output more suitable for validation purposes. NCBI RDF URI Standards – Linked Data for Professional Education. Topic: Publishing RDF; Competency: Determines whether to use hash (#) or slash (/).

NCBI RDF URI Standards – Linked Data for Professional Education

This document describes standards for NCBI-minted persistent URIs that identify RDF resources. The goals of this document include: Provide guidance to help projects get started publishing data on the Semantic Web; Provide standards and recommendations for the forms that the published RDF URIs should take; Provide distributed authority and control, that allows for groups/projects to mint their own identifiers, by providing namespaces; Specify a centralized system for handling HTTP requests to RDF URIs, in accordance with current best practices (e.g. Hash vs. Slash: What Is Identified? from Sean B. Palmer on 2001-11-28 (www-archive@w3.org from November 2001) To hash or to slash... here are some things to consider.

Hash vs. Slash: What Is Identified? from Sean B. Palmer on 2001-11-28 (www-archive@w3.org from November 2001)

This is also me doing my bit for rdfms-fragments [1]. Abstract: The question is whether or not "namespaces" on the Semantic Web should end with a hash "#", or a slash "/" (or even a question mark "? "). For example, the RDF Schema terms are all in the "namespace":- wheras the Dublin Core terms are in:- The difference?

Terms with the former will necessarily be URI-references, that is, a URI with a FragmentID on the end, whereas terms with the latter will most likely be URIs. TimBL's view is, apparently, that of the hashist. Language tags in HTML and XML. Overview Terminology In this article we refer to the value of a language attribute such as fr-CA as a language tag.

Language tags in HTML and XML

The fr and CA parts are referred to as subtags when described as parts of a tag. Language subtag lookup app. BCP 47 language tags are built from subtags in the IANA Subtag Registry.

Language subtag lookup app

This tool helps you find or look up subtags and check for errors in language tags. Read Choosing a Language Tag for step-by-step guidelines on creating language tags. This tool also provides information to guide your choices. 1 Raw data. Untitled. Graphite PHP Linked Data Library. RDF Triple-Checker. RDF Triple-Checker. RDF Translator. Contextus. Haystack Blog » A Quick Tutorial on the Turtle RDF Serialization. This post was going to be an email to a project mate in my database class, but I found myself wanting to markup the text in HTML so I figured I’d put it here. Unlike web specifications like HTML, which have only one representation on paper/disk, RDF is just an abstract model — it doesn’t matter how you represent it as long as you stay true to its abstract properties. So one of the first things people ask when it comes to RDF is, “Ok, so how to I write it?”

If you Google the web for this answer, you will probably come up with RDF/XML as your answer, which is the “official” representation. Unfortunately it is also a pretty painful and hard-to-read one, too. It would be as if the United States made its official food the brussel sprout. So this is a quick tutorial in Turtle, one of the more humane RDF serializations, IMHO, because it is simple to understand, quite readible/editable in raw form by a human, and relatively compact as far as RDF goes.

URIs, Literals, and Triples. Rdfabout/intro-to-rdf.md at gh-pages · JoshData/rdfabout. The Difference Between URLs and URIs. URI Conventions (OData Version 2.0) · OData - the Best Way to REST. OData Version 4.0 is the current recommended version of OData. OData V4 has been standardized by OASIS and has many features not included in OData Version 2.0. Go to OData Version 4.0 Introduction The Open Data Protocol (OData) enables the creation of REST-based data services, which allow resources, identified using Uniform Resource Identifiers (URIs) and defined in a data model, to be published and edited by Web clients using simple HTTP messages.

This specification defines a set of recommended (but not required) rules for constructing URIs to identify the data and metadata exposed by an OData server as well as a set of reserved URI query string operators, which if accepted by an OData server, MUST be implemented as required by this document. It is encouraged that servers follow the URI construction conventions defined in this specification when possible as such consistency promotes an ecosystem of reusable client components and libraries. 1. 2. The Registry! RDF data model and storage. Tutorial: Jena Semantic Web Framework. Today I was poking around the Jena RDF Framework, mostly to figure out how one would use an OWL reasoner there. The Data My test ontology is fairly simple: @prefix xsd:< . @prefix:< . @prefix rdfs:< .

:Person a owl:Class . :Opus a owl:Class . Owl:equivalentClass and owl:sameAs considered troublesome? "In creating an ontology it is best practice not to reinvent the wheel but to reuse existing classes and properties" I'd disagree with that, quite strongly. One of the ways that beginners get in trouble with the semantic web is that they try too hard to reuse existing classes and properties. Turtle-validator. RDF Validation and Conversion - ResearchSpace - Ontotext Wiki. Every Turtle/RDF file must be validated before committing to SVN. Access Innovations. Q? RDFS-Plus - ML Wiki. Semantic Web Technologies: XML, RDF, OWL. This talk summarizes material from the appropriate RFCs and W3C Recommendations, as well as: Extensible Markup Language (XML) 1.0 W3C Recommendation, 2006 Michel Klein. Tutorial: The Semantic Web. IEEE Intelligent Systems,(16)2. 2001.

Stefan Decker, Sergey Melnik, Frank Van Harmelen, Dieter Fensel, Michel Klein, Jeen Broekstra, Michael Erdmann, and Ian Horrocks. The Semantic Web: The Roles of XML and RDF. IEEE Internet Computing,(4)5. 2000. Cambridge Semantics. Introduction. Using SKOS vocabularies for improving web search. Bio2RDF v2.7a. RDA Registry. The Music Ontology – Getting started. The Music Ontology – Specification. The Music Ontology Specification provides main concepts and properties fo describing music (i.e. artists, albums and tracks) on the Semantic Web. Welcome to the OpenUp Data Enrichment Service. OpenUp Client. RDF and JSON: A Clash of Model and Syntax – Lost Boy. Relationship. RDFS and Inferencing. What is an RDF Vocabulary? A Resource Description Foundation (RDF) vocabulary is a defined set of predicates that can be used in an application.

RDFa 1.1 Distiller and Parser. XHTML+RDFa 1.1 - Third Edition. Learning Linked Data: Making Your data harvestable via RDFa. Association for Library Collections & Technical Services (ALCTS) Structured Data Validation and Testing Tools. Rdfabout/intro-to-rdf.md at gh-pages · JoshData/rdfabout. An introduction to the Semantic Web for health sciences librarians. Association for Library Collections & Technical Services (ALCTS)

Perpetual Enigma. RDF-Gravity. Gephi - The Open Graph Viz Platform. RDF Validation and Conversion - ResearchSpace - Ontotext Wiki. Seebi/rdf.sh. Rdfabout/intro-to-rdf.md at gh-pages · JoshData/rdfabout. How to publish Linked Data on the Web. Problems of the RDF model: Blank Nodes. RDF Translator. RDF - Semantic Web Standards. Graphs, XML, and RDF. SWValidators - Semantic Web Standards. What is difference b/w rdfs:domain and rdfs:range.? Things%20to%20be%20careful%20about%20-%20RDF.pdf. Namespace lookup for RDF developers.

Hyperthing - the Linked Data Validator. Semantic web - RDFS vs. OWL Reasoners — Design considerations. SemApps - Creating Semantic Applications: Using Jena to convert RDF/OWL file formats. The Music Ontology – Getting started. ISO 8601. First steps in RDFa: Creating a FOAF profile. Movie. Tutorial_Hermans. Linked Open Vocabularies. SKOS Simple Knowledge Organization System Primer. 02%20-%20Sean.pdf. 11ProtegeOWL2.pdf. Designing An Ontology In OWL - Using A Domain Or Range. Difference between domain and range in rdf schema? WAND Taxonomies Blog: Common Taxonomy Questions: What is the difference between a Taxonomy and an Ontology? What is the difference between a Taxonomy and an Ontology?

What is the difference between a taxonomy and an ontology? Semantic web - What is the difference between RDF Schema and Ontology? 02%20-%20Sean.pdf. Prefix.cc. Blazegraph. What is an RDF Blank Node? Jena - create RDF using defined OWL ontology. w3. Rdfabout/intro-to-rdf.md at gh-pages · JoshData/rdfabout.