Posts Tagged ‘Kendall Clark’

Stardog 2.1 Hits Scalability Breakthrough

Stardog LogoWashington, DC – January 21, 2014 – The new release (2.1) of Stardog, a leading RDF database, hits new scalability heights with a 50-fold increase over previous versions. Using commodity server hardware at the $10,000 price point, Stardog can manage, query, search, and reason over datasets as large as 50B RDF triples.

The new scalability increases put Stardog into contention for the largest semantic technology, linked data, and other graph data enterprise projects. Stardog’s unique feature set, including reasoning and integrity constraint validation, at large scale means it will increasingly serve as the basis for complex software projects.

“We’re really happy about the new scalability of Stardog,” says Mike Grove, Clark & Parsia’s Chief Software Architect, “which makes us competitive with a handful of top graph database systems. And our feature set is unmatched by any of them.”

The new scalability work required software engineering to remove garbage collection pauses during query evaluation, which the 2.1 release also accomplishes. Along with a new hot backup capability, Stardog is more mature and production-capable than ever before.

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Stardog Meets SPARQL

Kendall Clark recently discussed what users can expect from Stardog next. Clark wrote, “The most pressing need in Stardog is support for SPARQL 1.1. We got stuck between the devil and the deep blue sea—trying to push the 1.0 release before the SPARQL Working Group was completely finished with the SPARQL 1.1 spec. We were motivated to avoid reimplementing any parts of SPARQL 1.1 because the spec shifted. So we decided SPARQL 1.10 for the Stardog 1.0 release. Then we told everyone that SPARQL 1.1 would be the highest priority item for the post-1.0 release cycle. And so it’s been.” Read more

Stardog 1.0 Released

Kendall Clark of Clark & Parsia has announced the release of Stardog 1.0. Clark opines that this release is “the fastest, smartest, and easiest to use RDF database on the planet. Stardog fills a hole in the Semantic Technology (and NoSQL database) market for an RDF database that is fast, zero config, lightweight, and feature-rich. RDF and OWL are excellent technologies for building data integration and analysis apps. Those apps invariably require complex query processing, i.e., queries where there are lots of joins, complex logical conditions to evaluate, etc. Stardog is targeted at query performance for complex SPARQL queries. We publish performance data so you can see how we’re doing.” Read more

Highlights from WWW 2012 Conference

Juan Sequeda photoThis year was the 21st World Wide Web Conference located in Lyon, France. This conference is a unique forum for discussion about how the Web is evolving. There were hundreds of talks over 3 days. Let me summarize some Semantic Web presentations I was able to attend.


Programmers daily use the wget tool to specify and retrieve data on the Web. However, wget is limited since it cannot dig into the semantics of Web data to do the job. What if you were to add semantics to wget? This is the question that Valeria Fionda, Claudio Gutierrez and Giuseppe Pirró asked themselves. They took that question to the next level: imagine a semantic wget on top of Linked Data. They wanted to create a language to declaratively specify portions of the Web of Data, define routes and instruct agents that can do things for you on the Web. All this by exploiting the semantics of information (RDF data) found in online data sources. For example, find all the Wikipedia pages of directors that have been influenced by Stanley Kubrick and send them to my email; retrieving information about David Lynch from different information providers only gives a hint of what can be done. The researchers developed a simple, generic declarative language, NautiLOD and implemented it in swget (semantic wget). swget comes in two flavors: a simple command line tool (to give the Web back to users) and a GUI. This is not a fantasy anymore. Check it our for yourself (

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Attune Part II: Productivity Built on Semantics

“Attune is my favorite kind of semantic app: the kind where users can’t see the semtech, but it’s making life easier and better for them, and the developers, by being smart and flexible. We’re proud that Pancake has built Attune using Stardog as its RDF database.” – Kendall Clark, Clark & Parsia

Robert ButlerYesterday, in Part I of this two-part series, we learned about the new productivity application, Attune. Here in Part II, Robert Butler, president of Pancake Technology, tells us about the technology under the hood and why he chose to build Attune from the ground-up on top of Semantic Technologies. What Semantic Tech are you using?
Robert Butler: Attune was built on top of Stardog, Clark & Parsia’s new RDF database. All of the data, therefore, is stored as RDF data and we use Stardog’s intuitive native interface to update or create data. Queries are run using SPARQL. We have built OWL 2 ontologies for Attune, currently targeted at the QL profile. We plan to increase our use of ontology expressability, eventually using either EL or RL.

SW: Why did you choose Semantic Technologies rather than other options?
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Attune Part I: Productivity with Semantics (and Pancakes?)

Attune - keeping you in tune with everything you need.Pancake Technology, LLC has released a new productivity application called Attune and we caught up with Robert Butler, the company’s president (“The president of Pancake” — now there’s a job title I’m envious of!) to learn more about Attune and the semantic platform under its hood. In part one of this two-part interview, we learn about what users of Attune can experience now and what they can look forward to as the product matures.

Q: What is Attune?
A: Attune is a flexible and powerful personal productivity application, built to overcome limitations in current productivity tools. Attune allows you to create lists, notes, tasks and projects and relate them to each other.

Q: With a lot of productivity applications out there, what’s different here? Why did you create Attune?
Robert ButlerA: I have long been frustrated by the inflexibility of existing productivity tools. They almost always seem overly rigid and unable to capture the complexity of my thoughts and projects. My brain doesn’t always operate in terms of tasks and projects, which is why I often resort to note taking to capture my thoughts and why I like products like Evernote. If you are going to build a tool that can capture and remember the vast majority of information in the world, you need text and images. On the other hand, the goal of all the free-form text and images out there is to actually use it to get something done, which brings you back to the structure of tasks and projects. To our knowledge, there isn’t a tool out there that handles this duality well.

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Data Integration: What’s The Way You Like It?

Ask a group of Semantic Web professionals where the data should live when you’re doing data integration projects – which is just what Cambridge Semantics VP Lee Feigenbaum, acting in his capacity as co-chair of the W3C’s SPARQL Working Group, did at a panel at last week’s SemTech – and don’t expect to get a single, agreed-upon answer.

Among the choices:

“Federation will crush warehousing,” Eric Prud’hommeaux of the W3C and its Semantic Web Health Care and Life Sciences Interest Group said with an eye to provocation. “Leave data where the authorities have it and take advantage of individual domain contributions.” The basic idea of federation is that data stays in its source systems and you do integration dynamically, querying source systems on the fly.

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Clark & Parsia: New Products to Save Data From Death In An ECM Repository, And To Tackle Smaller Data Sets of Big Strategic Value

Is your enterprise content management system the place where your information goes to die? It doesn’t have to be that way.

At the SemTech conference in June, Kendall Clark of Clark & Parsia will formally launch Spanner and Stardog, the former of which is already in use at NASA and the latter of which will be entering private beta mode in the next couple of weeks. Spanner takes semantics to ECM, to help enterprises make the pivot from unstructured to semi-structured and structured information management affordable, useful and valuable, Clark says.

Stardog is its RDF database aimed at the high-value, lower-dataset size of the market, and Spanner will be able to utilize it. Alternately, organizations that already have an existing commitment to an RDF database can continue to employ that in conjunction with Spanner.

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SemTech 2009 Post-Event Media, Blogs, and Trip Report Items

There were a lot of articles and blog postings written about the Semantic Technology Conference. Below is a list of those we are aware of.  If you know of others, feel free to send them to us at info (at) so we can add them to this list.

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