Introduction - semanticweb.com http://semanticweb.com The Voice of Semantic Web Business Copyright 2013 Tue, 18 Jun 2013 20:30:26 +0000 http://blogs.law.harvard.edu/tech/rss http://wordpress.org/?v=3.4.1 Introduction to: Reasoners Name Tag: Hello, we are ReasonersReasoning is the task of deriving implicit facts from a set of given explicit facts. These facts can be expressed in OWL 2 ontologies and stored RDF triplestores. For example, the following fact: “a Student is a Person,” can be expressed in an ontology, while the fact: “Bob is a Student,” can be stored in a triplestore. A reasoner is a software application that is able to reason. For example, a reasoner is able to infer the following implicit fact: “Bob is a Person.”

Reasoning Tasks

Reasoning tasks considered in OWL 2 are: ontology consistency, class satisfiability, classification, instance checking, and conjunctive query answering.

continued…

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]]> Juan Sequeda http://semanticweb.com/introduction-to-reasoners_b36245#disqus_thread http://semanticweb.com/introduction-to-reasoners_b36245 http://semanticweb.com/?p=36245 Wed, 29 May 2013 15:55:51 +0000 Introduction to: Triplestores Badge: Hello, my name is TriplestoreTriplestores are Database Management Systems (DBMS) for data modeled using RDF. Unlike Relational Database Management Systems (RDBMS), which store data in relations (or tables) and are queried using SQL, triplestores store RDF triples and are queried using SPARQL.

A key feature of many triplestores is the ability to do inference. It is important to note that a DBMS typically offers the capacity to deal with concurrency, security, logging, recovery, and updates, in addition to loading and storing data. Not all Triplestores offer all these capabilities (yet).

Triplestore Implementations

Triplestores can be broadly classified in three types categories: Native triplestores, RDBMS-backed triplestores and NoSQL triplestores. continued…

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]]> Juan Sequeda http://semanticweb.com/introduction-to-triplestores_b34996#disqus_thread http://semanticweb.com/introduction-to-triplestores_b34996 http://semanticweb.com/?p=34996 Thu, 31 Jan 2013 15:30:54 +0000 Getting Started with the Semantic Web Using SPARQL with R

A new article on R Bloggers explains how to get “up and running on the Semantic Web” using SPARQL with R in under five minutes. The article states, “We’ll use data at the Data.gov endpoint for this example. Data.gov has a wide array of public data available, making this example generalizable to many other datasets. One of the key challenges of querying a Semantic Web resource is knowing what data is accessible. Sometimes the best way to find this out is to run a simple query with no filters that returns only a few results or to directly view the RDF. Fortunately, information on the data available via Data.gov has been cataloged on a wiki hosted by Rensselaer. We’ll use Dataset 1187 for this example. It’s simple and has interesting data – the total number of wildfires and acres burned per year, 1960-2008.” continued…

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]]> Angela Guess http://semanticweb.com/getting-started-with-the-semantic-web-using-sparql-with-r_b35030#disqus_thread http://semanticweb.com/getting-started-with-the-semantic-web-using-sparql-with-r_b35030 http://semanticweb.com/?p=35030 Tue, 29 Jan 2013 13:00:28 +0000 Infographic: The Importance of RDFa

Mind Development and Design has shared an infographic on The Importance of RDFa. The article states, “RDFa (or Resource Description Framework – in – attributes) is a W3C Recommendation that adds a set of attribute-level extensions to HTML, XHTML and various XML-based document types for embedding rich metadata within Web documents. What does that mean? It means that RDFa give your content more meaning… it allows content to make sense to the search engines.” continued…

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]]> Angela Guess http://semanticweb.com/infographic-the-importance-of-rdfa_b32320#disqus_thread http://semanticweb.com/infographic-the-importance-of-rdfa_b32320 http://semanticweb.com/?p=32320 Tue, 25 Sep 2012 14:30:46 +0000 Video: Linked Data for Libraries The OCLC has created a video entitled Linked Data for Libraries. The fourteen minute video provides an introduction to the concepts and technology behind linked data as well as how linked data works and how it is used in libraries.

According to the organization website, “OCLC is a nonprofit, membership, computer library service and research organization dedicated to the public purposes of furthering access to the world’s information and reducing information costs. continued…

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]]> Angela Guess http://semanticweb.com/video-linked-data-for-libraries_b31326#disqus_thread http://semanticweb.com/video-linked-data-for-libraries_b31326 http://semanticweb.com/?p=31326 Wed, 08 Aug 2012 16:30:09 +0000 Presentation: SPARQL, Queries, & Linked Data A new presentation from the ICWE Conference is available online. The presentation is titled An Introduction to SPARQL and Queries over Linked Data: “Nowadays, more and more datasets are published on the Web adhering to the Linked Data principles. The availability of this data, including the existence of data-level connections between datasets, presents exciting opportunities for the next generation of Web-based applications. As a consequence, consuming Linked Data is a highly relevant topic in the context of Web engineering. Our introductory tutorial aims to provide participants with an understanding of one of the basic aspects of Linked Data consumption, that is, querying Linked Data.” continued…

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]]> Angela Guess http://semanticweb.com/presentation-sparql-queries-linked-data_b31033#disqus_thread http://semanticweb.com/presentation-sparql-queries-linked-data_b31033 http://semanticweb.com/?p=31033 Thu, 26 Jul 2012 14:30:39 +0000 Linked Data: An Introduction John Goodwin has written a useful introduction to linked data. He begins, “In the early 1990s there began to emerge a new way of using the internet to link documents together. It was called the World Wide Web. What the Web did that was fundamentally new was that it enabled people to publish documents on the internet and link them such that you could navigate from one document to another. Part of Sir Tim Berners-Lee’s original vision of the Web was that it should also be used to publish, share and link data. This aspect of Sir Tim’s original vision has gained a lot of momentum over the last few years and has seen the emergence of the Linked Data Web.” continued…

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]]> Angela Guess http://semanticweb.com/linked-data-an-introduction-2_b30559#disqus_thread http://semanticweb.com/linked-data-an-introduction-2_b30559 http://semanticweb.com/?p=30559 Mon, 09 Jul 2012 11:15:05 +0000 Semantic Web Lessons from Cambridge Semantics As part of their Semantic University, Cambridge Semantics has published a number of helpful “lessons” covering concepts related to the Semantic Web. Since we last checked in with this excellent tutorial series, they have added several lessons:

Semantic Web vs. Semantic Technologies – “That Semantic Web technologies and semantic technologiesboth start with semantic is often a source of confusion. This short lesson clarifies the relationship between Semantic Web technologies and semantic technologies.” continued…

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]]> Angela Guess http://semanticweb.com/semantic-web-lessons-from-cambridge-semantics_b28345#disqus_thread http://semanticweb.com/semantic-web-lessons-from-cambridge-semantics_b28345 http://semanticweb.com/?p=28345 Thu, 19 Apr 2012 17:00:15 +0000 Introduction to: RDFa Name Badge - Hello, My Name is RDFaSimply put, RDFa is another syntax for RDF. The interesting aspect of RDFa is that it is embedded in HTML. This means that you can state what things on your HTML page actually mean. For example, you can specify that a certain text is the title of a blog post or it’s the name of a product or it’s the price for a certain product. This is starting to be commonly known as “adding semantic markup”.

Historically, RDFa was specified only for XHTML. Currently, RDFa 1.1 is specified for XHTML and HTML5. Additionally, RDFa 1.1 works for any XML-based language such as SVG. Recently, RDFa Lite was introduced as “a small subset of RDFa consisting of a few attributes that may be applied to most simple to moderate structured data markup tasks.” It is important to note that RDFa is not the only way to add semantics to your webpages. Microdata and Microformats are other options, and I will discuss this later on. As a reminder, you can publish your data as Linked Data through RDFa. Inside your markup, you can link to other URIs or others can link to your HTML+RDFa webpages.

Why publish RDFa? continued…

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]]> Juan Sequeda http://semanticweb.com/introduction-to-rdfa-2_b26361#disqus_thread http://semanticweb.com/introduction-to-rdfa-2_b26361 http://semanticweb.com/?p=26361 Mon, 06 Feb 2012 09:00:43 +0000 Learn Ontology Development at SemTechBiz DC In less than one week SemTechBiz DC will arrive at the Kellogg Conference Hotel in Washington, DC. The conference, which takes place November 29-December 1, 2011, will feature highly-anticipated sessions led by top thinkers in the fields of Open Government, Content Management, Enterprise Data Management, Linked Data, and much more.

Featured Presentation

Photo of Presenters Elisa Kendall and Deborah L. McGuinness

Elisa Kendall and Deborah L. McGuinness

Ontology 101: An Introduction to Knowledge Representation and Ontology Development with Elisa Kendall, Partner – Thematix LLC and Deborah McGuinness, Tetherless World Chaired Constellation Professor – Rensselaer Polytechnic Institute (RPI)

This presentation will provide an introductory-level technical examination of ontologies. continued…

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]]> Angela Guess http://semanticweb.com/learn-ontology-development-at-semtechbiz-dc_b24886#disqus_thread http://semanticweb.com/learn-ontology-development-at-semtechbiz-dc_b24886 http://semanticweb.com/?p=24886 Wed, 23 Nov 2011 11:12:40 +0000 Summer School – Excecutive Briefing on Linked Data Summer can be a great time to learn something new, and SemanticWeb.com is always on the lookout for new ways of explaining the terms, techniques, standards, and technologies involved in the world of Semantic Web. We were thrilled, then, to see this much-needed executive briefing on Linked Data from our colleagues at 3 Round Stones:

Please share this video with anyone you think would benefit, leave a comment below, and check out some of these other resources:

 

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]]> Eric Franzon http://semanticweb.com/summer-school-excecutive-briefing-on-linked-data_b20742#disqus_thread http://semanticweb.com/summer-school-excecutive-briefing-on-linked-data_b20742 http://semanticweb.com/?p=20742 Fri, 17 Jun 2011 18:30:02 +0000 Spotlight on Callimachus One of the many innovative semantic solutions that was presented at this week’s SemTech conference is Callimachus, a linked data management system that “allows Web authors to quickly and easily create semantically-enabled Web applications with a minimal knowledge of Semantic Web principles.” According to Bernadette Hyland, Callimachus is the first system of its kind. continued…

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]]> Angela Guess http://semanticweb.com/spotlight-on-callimachus_b20500#disqus_thread http://semanticweb.com/spotlight-on-callimachus_b20500 http://semanticweb.com/?p=20500 Fri, 10 Jun 2011 09:00:08 +0000 Introduction to: Ontologies Hello my name is ontologyIn my most recent post, I introduced RDF as a flexible and schema-less data model. However, some of you may think then that using RDF data is going to be a complete mess. In some cases, that may be true; and it’s fine! There are use cases in which all you want is messy data. What if you want to do more interesting stuff with your RDF data like infer new knowledge? This is where ontologies come in.

What is an Ontology?

Let me scare you for a minute. The computer science definition of ontology is:

a formal and explicit specification of a shared conceptualization

Huh?!

Let’s break this down and get our hands dirty. continued…

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]]> Juan Sequeda http://semanticweb.com/introduction-to-ontologies_b18705#disqus_thread http://semanticweb.com/introduction-to-ontologies_b18705 https://semanticweb.com/?p=18705 Tue, 05 Apr 2011 11:30:02 +0000 Introduction to: RDF Hello, My Name is... RDFRDF stands for Resource Description Framework and it is a flexible schema-less data model. Do not confuse or compare it with XML (more about this later)! It is one of the core technologies of the Semantic Web and the current W3C standard to represent data on the web. But what is RDF exactly?
 
As I mentioned, it is a data model. It can be compared to the relational model which is the way you organize data in a relational database: group related things in tables with attributes, create links between tables, etc. RDF is just another way of organizing your data. In which way? As a graph.

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]]> Juan Sequeda http://semanticweb.com/introduction-to-rdf_b17953#disqus_thread http://semanticweb.com/introduction-to-rdf_b17953 https://semanticweb.com/?p=17953 Wed, 23 Feb 2011 11:30:28 +0000 Semantic Web – Pitch of the week Last week, SemanticWeb.com put out a challenge to our readership to answer the questrion, “What is the Semantic Web?” in the form of a 90-second elevator pitch.  Read the original challenge and watch the video here.

This week, we are pleased to feature this entry from Sandro Hawke of the World Wide Web Consortium.  It’s a good one, and Sandro gets extra points for actually shooting his video in an elevator (at MIT’s Stata Center, no less)! 

What is the Semantic Web? (for a general, non-technical audience)

Shortly after we published the initial request for pitches, Sandro reached out asking if a better question might not be, “What is the Semantic Web good for?” addressing the value proposition.  It’s a good point, and I expect that many pitches will answer this question as well.  Certainly, if you feel that’s a stronger angle, feel free to pitch accordingly.

As Sandro’s video shows, a pitch doesn’t have to be complicated.  In fact, it should not be.  It does not need to explain the many nuances of semantic technology.  The main goal of these pitches should be to grab a listener’s interest such that the listener says, “Tell me more.”

So, Semantic Web community, “Tell me more!” keep those pitches coming!

See how to submit your own pitch here.

–Eric Franzon
VP Community
SemanticWeb.com

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]]> Eric Franzon http://semanticweb.com/semantic-web-pitch-of-the-week_b17527#disqus_thread http://semanticweb.com/semantic-web-pitch-of-the-week_b17527 https://semanticweb.com/?p=17527 Thu, 03 Feb 2011 11:51:02 +0000