My name is Richard Cyganiak.
I'm a software engineer at TopQuadrant. I work on web technologies for managing data and am based in Dublin, Ireland.
Author Archives: Richard Cyganiak
URIs have a namespace part and a local part, right?
This is a technical post on the way URIs break down into “namespace parts” and “local parts” in RDF. It was prompted by this comment in a recent discussion: In a URI, the namespace part ends with the last slash … Continue reading
Posted in General, Semantic Web Comments Off on URIs have a namespace part and a local part, right?
Multiple itemtypes in Microdata
There’s a lot of discussion recently around HTML5’s microdata proposal, and how it relates to W3C’s earlier RDFa standard that is currently being updated for HTML5. Microdata solves many of the use cases of RDFa in a much simpler way. … Continue reading
Posted in General 4 Comments
The RDF 1.1 Literal Quiz
Let’s pretend we live in January 2013, and RDF 1.1 has just been published. This including the RDF Working Group’s attempt to clean up string literals. The issue with string literals is that RDF currently offers three different ways for … Continue reading
Posted in Semantic Web 1 Comment
Creating an RDF vocabulary: Lessons learned
With tools like Neologism and OpenVocab, creating an RDF vocabulary is easy. But if your goal is re-use within a wider community, you will face many questions that are not so easy to answer: How much work is it going … Continue reading
Posted in General 4 Comments
Blank nodes considered harmful
Well, they are not always harmful. But most of the time. I’ll get to that in a minute. On the firstname.lastname@example.org list, W3C’s Sandro Hawke has a lucid and concise summary of the problems with blank nodes in RDF. It’s … Continue reading
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Top 100 most popular RDF namespace prefixes
I run prefix.cc, a website for RDF developers where anyone can register and look up the expansion URIs for namespace prefixes such as foaf, dc, qb or void. The site tracks which prefixes gets looked up most often. This allows … Continue reading
Posted in General 2 Comments
This weblog has become quiet. These days, most of my word count goes into mailing lists, Twitter, and way too much personal email. Over here on the blog, cobwebs are gathering and some signs of bitrot have become evident. So … Continue reading
Posted in General Comments Off on Maintenance
prefix.cc is a website I’ve made last February to ease a very common task in the life of RDF developers and SPARQL users: looking up namespace URIs. A short summary of what the site can do for you is available … Continue reading
Posted in General, Semantic Web Comments Off on prefix.cc, MkII
What’s in a name? And the Linked Data Police
So I wrote a rather angry private email to Erik Wilde a few days ago, complaining about his use of the term “linked data” for a site that doesn’t follow the linked data practices. Erik decided to publish my email … Continue reading
Posted in General, Semantic Web 7 Comments
Linked data at the New York Times: Exciting, but buggy
Update: Evan Sandhaus reports that all the issues mentioned below will be fixed. Great! Yesterday at the International Semantic Web Conference, Evan Sandhaus of the New York Times unveiled data.nytimes.com, a site that publishes linked data for some parts of … Continue reading
Posted in General, Semantic Web 10 Comments