linkeddata
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logd.tw.rpi
The TWC LOGD team has developed several tools that are helpful for creating and hosting semantic web versions of government data. On this page we share them so that others can do the same thing: In its simplest form, csv2rdf4lod is a quick and easy way to produce an RDF encoding of data available in Comma-Separated-Values (CSV). In its advanced form, csv2rdf4lod is a custom reasoner tailored for some heavy-duty data integration. The Google Visualization API lets you access multiple sources of structured data that you can display, choosing from a large selection of visualizations.rww
openapi
The semantic web is given a rough raking by the syntactic web, and it is not impossible to see why when you first get taken down the SPARQL/RDF/Ontology rabbit hole. It is not great fun learning to develop with the semantic web today. (As an aside, using a semi-SQL model as a primary metaphor in SPARQL did not help me personally. But then, SQL has always seemed like an assembly language designed by Prolog programmers)
Linked Data at the Guardian | Open Platform | guardian.co.uk
Linked Data Entity Extraction with Zemanta and OpenCalais - benjamin nowack's blog
A comparison of the NER APIs by Zemanta and OpenCalais. I had another look at the Named Entity Extraction APIs by Zemanta and OpenCalais for some product launch demos. My first test from last year concentrated more on the Zemanta API. This time I had a closer look at both services, trying to identify the "better one" for "BlogDB", a semi-automatic blog semantifier. My main need is a service that receives a cleaned-up plain text version of a blog post and returns normalized tags and reusable entity identifiers. So, the findings in this post are rather technical and just related to the BlogDB requirements.
Linked data is the first practical expression of the semantic Web , useful and doable today, and applicable to all forms of data. Sources such as the four principles of linked data in Tim Berners-Lee's Design Issues: Linked Data and the introductory statements on the linked data Wikipedia entry approximate -- but do not completely express -- an accepted or formal or official definition of linked data per se . Building from these sources and attempting to be more precise, here is the definition of linked data used internally by Structured Dynamics:
Linked Data FAQ
Pezholio » Blog Archive » A beginner’s guide to SPARQLing linked data (Part 1)
Regular readers of this blog will have seen that, over the past 12 months or so, I’ve been banging on about linked data and SPARQL quite a bit, posting up example queries and the like, but with not much explanation about why I’m doing what I’m doing. Thanks to the good folks at Talis and their offer of a free linked data store for spending data , I’ve also got a nice little store of my own, and I thought it was high time I went back to basics and passed on what I’ve learnt to other people. First, a bit of background The web, as most of us know it, is a network of documents , with each document having an individual URI to show its location on the web. With linked data, the web becomes an network of things with each thing having an individual URI to tell us more about it.
The Semantic Link is open | Paul Miller - The Cloud of Data
At the end of last month, I wrote about the new Semantic Link podcast that I’m involved with for SemanticWeb.com. I look forward to lining up some great conversations – and guests – in the year ahead. We will record and publish regularly each month.Web 2.0 is so yesterday. Perhaps, that’s an overstatement, but Web 3.0, the semantic web , is rapidly moving beyond the academic laboratory to real-world utilization. Now the W3C RDB2RDF Working Group has published the First Public Working Draft of " A Direct Mapping of Relational Data to RDF .” This work is a major step towards making the astounding amount of data stored in relational databases more easily available to the semantic web. Semantic What? Web 2.0 focused on establishing interactive human-to-human communities on the internet with rich content.
Semantic Web Gets Closer to Relational Data
Opening Linked Data – webr3.org
Linked Data has done fantastically well so far, but, compared to how well it could be doing, given the calibre and amount of data that's been opened up, it's not doing too well at all. Why? well the sem web community is packed full of the most technically skilled and decent people I've come across so far, so it can't be that, the tooling is pretty damn good, there's loads of data, most of the data's of a high quality, wanted by developers, and certainly more than usable. The concepts, theory and technical aspects are all solid as a rock.
Linked Open Data Around-the-Clock ( LATC ) is a new project that aims to make it easier for government agencies and web developers across the globe to gain access to information from other organisations. The project is being co-ordinated by the Digital Enterprise Research Institute at the National University of Ireland. The Linked Open Data (LOD) cloud has doubled in size every 10 months since 2007, and is a collection of more than 200 datasets that offer more than 25 billion interlinked facts available from various domains.
Linked Open Data cloud takes shape - 25 Nov 2010 - Computing News
Linked Data Patterns
This work is licenced under the Creative Commons Attribution 2.0 UK: England & Wales License. To view a copy of this licence, visit http://creativecommons.org/licenses/by/2.0/uk/ . Thanks to members of the Linked Data mailing list for their feedback and input, and Sean Hannan for contributing some CSS to style the online book.
Virtuoso Linked Data Deployment In 3 Simple Steps
Injecting Linked Data into the Web has been a major pain point for those who seek personal, service, or organization-specific variants of DBpedia . Basically, the sequence goes something like this: Inability to find robust tools with which to generate Linked Data from existing data sources such as relational databases, CSV files, XML, Web Services, etc. Install the Sponger Bookmarklet for the URIBurner service . Bind this to your own SPARQL -compliant backend RDF database (in this scenario, your local Virtuoso instance), and then Sponge some HTTP-accessible resources. Use the CVS import feature to import their content into Virtuoso's relational data engine; then use the built-in RDF Views Wizard as with other RDBMS data.ISKO–UK Linked Data Conference, 26/10/10, WRAP repository blog
This event, hosted by UCL, was one that I had been looking forward to for some time. Whether or not linked data is the 'next big thing' in web technology, and one that has to potential to solve a number of thorny problems for the administrators and maintainers of web resources in the face of increasingly complex demands, is a question that only time will answer. However as it stands at present linked data has enormous potential as a service and as a tool and I wanted to find out more before I started getting any awkward questions from stakeholders! The sessions on the day were a nice mix of technical and non-technical and my biggest fear of being lost before the end of the keynote was mercifully misplaced. Also very usefully the presenters not only spoke about the technology and standards underpinning the creation of linked data but also presented us with a number of real world example of things that linked data can be used to achieve.Cette semaine une information a commencé à circuler sur le net: Météo-France libérait ses données ! Je me rendis donc, enthousiaste, sur https://public.meteofrance.com/ . Déjà refroidie par l’encart Données et tarifs , je décide de passer outre et après quelques minutes de navigation et de téléchargements de PDF, je découvre effectivement le lien - Observation France en format CSV - esseulé en bas de la page https://public.meteofrance.com/france/observations . L’IGN également annonce que leur RGE sera bientôt gratuit et accessible à toutes les collectivités . Deux initiatives (sic) qui découlent de la directive Inspire. Côté breton, un relent d’information avec un article de David Mentré qui interpelle Kéolis et Rennes Métropole sur leur licence d’utilisation des données : Pourquoi l’ouverture des données de Rennes Métropole est insuffisante ?
L’opendata dans tous ses états – Veille Oct. II «
There are several different opinions and definitions on what data quality is supposed to be. Most of the time, we adapt the “fitness for use by data consumers” definition as defined by Richard Wang and Diane Strong [1] who investigated the subjective quality perception of data quality by data consumers. Although this research work has been a milestone in data quality research, in my opinion data quality is not necessarily always subjective. Imagine valid combinations of cities and countries or accurate population values.