Drupal

A week in Ecuador - Viva el Drupal Latino!

Earlier this month I spent a week in Ecuador. It was my first time in Latin America. I wasn't sure what to expect given that I don't speak Spanish, but I must say I had a blast, it was a lot of fun! I was invited to present a couple of sessions on the Semantic Web and Drupal at the Drupal Summit Latino which took place in the city of Loja. Besides the usual RDF, SPARQL and schema.org topics, I also presented something new this time: WebID. Even though the Drupal implementation is still maturing, there was quite some interest and enthusiasm, followed by a conversation with Felix Delattre on WebID + OpenID. The Drupal Latino Summit event gathered around 150 people mostly from Ecuador, although the speakers were coming from all over Latin America and a few flew from North America. Drupal was new to many of the attendees. Some attendees were familiar with Free Software in particular Debian. The organizers did an amazing job at running the Camp which from my point of view went very smoothly. They hired a translator to translate my sessions in Spanish and distributed remote headsets to the attendees. Questions from the audience were translated from Spanish back to English to my headset. When the translator wasn't around, others were happy to act as translators (thanks Molly, Rommel, Felix and Eric among others!). The event was hosted by one of the local universities: Universidad Tecnica Particular de Loja, located on a hill looking over the city. Combined with a perfect weather, this was an ideal location for spending some time talking Drupal and meeting new people.

Log in with WebID and get to comment without moderation

Last week I released a new alpha version of the WebID module for Drupal, and today I've just added a first integration with the Drupal Rules modules allowing to trigger customizable actions whenever someone logs in with his WebID. For example, the WebID module now comes out of the box with a default rule to grant user logging in with their WebID the role "webid guest". From there it's easy to give them specific permissions on your site, such as skipping the moderation queue for comments. This is currently set on this site, to try it out, first log in with your WebID at the top right corner, and then leave a comment. Let's see how long it takes for spammers to catch up with WebID...

Can microdata support multiple vocabularies?

In Drupal 7 we often use multiple types to describe pieces of content, for example a node is a sioc:Post and a foaf:Document, a comment a sioc:Post and a sioct:Comment. This is useful when you want to be generic and specific at the same time, or when a consumer only recognizes one vocabulary and not the other. For example imagine that you want to combine Facebook's Open Graph protocol and schema.org vocabularies onto the same page elements so that your blog posts are recognized by Facebook, Google and Bing. Another use case is a news website using rNews, a proposed standard developed by the IPTC for annotating news-specific metadata. There is great incentive for such news website to also be indexed by the major search engines, which will only recognize the schema.org vocabularies.

Update: alex b posted another interesting use case on the schemaorg-discussion mailing list:

I can imagine that some businesses may fit into more than one Schema
tag. Will there be a problem with applying more than one? For
example I might want to apply the following tags to a car dealer:
AutoDealer,
AutoRepair, AutoPartsStore if they perform all of these functions of
course. Is this going to fly or is this something we're not
supposed to do?

From the use cases above, it is clear that the ability to combine vocabularies is essential for allowing a decentralized extensibility on the Web.

Background research work leading to RDF in Drupal 7 released as part of my Master's thesis

Oct 22nd, 2010 NUIG graduation leaflet (Photo credit: Anna Dabrowska)

Today it's about time to make my M.Sc. thesis available online. The review process took a long while, but I finally graduated from DERI, National University of Ireland, Galway last October. That's more than a year after I submitted my thesis and actually left Galway to move to Boston.

The Open Graph protocol and Drupal

Administration interface of the open graph protocol Drupal module

A couple of days after Dries Buytaert gave his keynote at DrupalCon San Francisco and reaffirmed his support for the Semantic Web in Drupal, Facebook co-founder Mark Zuckerberg announced at the f8 developer conference the brand new Open Graph protocol, a technology to turn webpages into social objects and capture them in a social graph. The announcement was backed up by a lot of PR and according to Facebook, 50,000 websites have already implemented OGP including IMDb, NHL, Posterous, Pandora, Rotten Tomatoes, Yelp and more. There is plenty to read about the marketing around this announcement, but I'm going to keep this post at a technical level only.

RDFa in Drupal 7: last call for feedback before alpha release

The first alpha release of Drupal 7 will be created next Friday Jan 15th. We've already incorporated most of the feedback we received from the semweb community so far, but I wanted to give the community a last chance to review the RDFa markup and the default RDF mappings we use before it's too late. I should emphasize that all the markup and default RDF mappings that we ship in core will be pretty much set in stone after the stable release of Drupal 7, hence this call for feedback. Site administrators who care about semantics will be able to alter these mappings by installing extra modules, but many people (read several 10K sites) will just install Drupal 7 and not care about the semantics it generates. Therefore we want to make sure the RDFa generated by Drupal out of the box is somewhat correct and does not make folks from the semantic/pedantic web community angry :) - we've tried to keep the semantics as generic as possible for that reason.

RDF mappings

I've created a diagram representing the default semantics of the core data structure which has been committed and I would appreciate feedback on the RDF terms we've used.

Drupal 7 core RDF schema

RDFa markup

To make the RDFa markup review process easier, I've updated the usual testing site at http://drupalrdf.openspring.net/. It features a blog post with some comments which represents a typical Drupal 7 page annotated with RDFa. Some other pages have been randomly generated to be able to test the tracker which acts as a very simple sitemap in RDFa.

Status of RDF in Drupal (November 09) and wrap up of ISWC2009

ISWC 2009 background - http://www.flickr.com/photos/kasei/4055714142/

I had the pleasure to give a presentation of the paper "Produce and Consume Linked Data with Drupal!" at ISWC2009 last, and I was very honored we won the Best Semantic Web in Use Paper award! The 30 minutes of presentation + Q/A passed very quickly and I didn't have much time to expand on the status of RDF in Drupal 7 vs. Drupal 6 after describing the inner workings of the modules we developed. I'm sure this will also interest some people outside the attendees. First of all, the current stable version of Drupal is Drupal 6 (the latest version at the time of this writing being Drupal 6.14). This is the version on which we started to implement the contributed modules presented at ISWC2009, namely RDF CCK, RDF external vocabulary importer (Evoc), SPARQL Endpoint and RDF SPARQL Proxy. Contributed modules means they do not get included in the core Drupal package, but people can download them from drupal.org for free and drop them on their server so Drupal core can be extended. These 4 modules work pretty well on Drupal 6, you can get RDF export in RDF/XML, N-Triples, turtle, json. However generating RDFa is not very easy as it requires to patch the CCK on which we rely to generate the content pages and store the various field data. We made sure this would not be a problem in the next version of Drupal (Drupal 7) which is still under development, and due to be released sometime next year.

Produce and Consume Linked Data with Drupal!

Drupal in the Linked Data CloudProduce and Consume Linked Data with Drupal! is the title of the paper I will be presenting next week at the 8th International Semantic Web Conference (ISWC 2009) in Washington, DC. I wrote it at the end of M.Sc. at DERI, in partnership with the Harvard Medical School and the Massachusetts General Hospital which is where I am now working.

It presents the approach for using Drupal (or any other CMS) as a Linked Data producer and consumer platform. Some part of this approach were used in the RDF API that Dries committed a few days ago to Drupal core. I have attached the full paper, and here is the abstract:

Currently a large number of Web sites are driven by Content Management Systems (CMS) which manage textual and multimedia content but also - inherently - carry valuable information about a site's structure and content model. Exposing this structured information to the Web of Data has so far required considerable expertise in RDF and OWL modelling and additional programming effort. In this paper we tackle one of the most popular CMS: Drupal. We enable site administrators to export their site content model and data to the Web of Data without requiring extensive knowledge on Semantic Web technologies. Our modules create RDFa annotations and - optionally - a SPARQL endpoint for any Drupal site out of the box. Likewise, we add the means to map the site data to existing ontologies on the Web with a search interface to find commonly used ontology terms. We also allow a Drupal site administrator to include existing RDF data from remote SPARQL endpoints on the Web in the site. When brought together, these features allow networked RDF Drupal sites that reuse and enrich Linked Data. We finally discuss the adoption of our modules and report on a use case in the biomedical field and the current status of its deployment.

Half way through the RDF code sprint - Google Announces Support for RDFa

We're half way through the sprint and we just heard that Google has announced support for RDFa. What a coincidence, surely another sign proving Drupal's heading in the right direction! Now is time for some update on the sprint.

During day 1, we decided to split the group into two in order to enable some parallel developement and to make use of the 2 main skills we had at hand: RDF semantics and Drupal coding.

RDFa in Drupal: Bringing Cheese to the Web of Data

"RDFa in Drupal: Bringing Cheese to the Web of Data" is the title of our short paper which was recently accepted at the 5th Workshop on Scripting and Development for the Semantic Web. It seems that the topic of food on the semantic web is the new black as this paper comes out at the same time as Boris Mann's announcement about the Open Restaurants aka "BaconPatioBeer".

This paper illustrates how a CMS like Drupal can be used on the Semantic Web and make every Drupal site part of the growing Web of Data. We created a cheese review site as a use case. It relies on the RDF API and the RDF CCK modules.

The good news is that we are working to get this RDF goodness into Drupal core! We are organizing an RDF code sprint. This sprint builds on Dries' ideas expressed in his recent posts Drupal, the semantic web and search and RDFa and Drupal. With RDF in the core of Drupal and RDFa output by default, it's dozens of thousands of websites which will all of a sudden start publishing their data as RDF.

So far, Stéphane Corlosquet, Florian Loretan, Benjamin Melançon and Rolf Guescini have signed up. How about you?

Some others are willing to come but cannot afford the trip until some funding is secured. To help us fund the sprint and bring more Drupal rockstars on board, please consider making a donation using the ChipIn widget on this page. The money will be used to cover flight, food and hotel costs for the sprinters. All sprinters are generously donating their time to make this happen. It would also be great to fly in a few additional people with extensive testing and Fields experience. Any excess money will be used to add more people, or will be donated to the Drupal Association.

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