Dave Johnson on open web technologies, social software and Java
This is the closest thing to a blog post that I've written lately, a post to the OpenSocial specification group on aligning OpenSocial with RDF and Linked Data:
Link: RDF and OpenSocial
This is a topic of interest to me, so I'll try to elaborate.
First, I want to point out that RDF is not a representation, it's a way to model data and it's multiple ways to represent that data (in XML, JSON, etc.). I think the real question is: how do we enable OpenSocial to hook into the RDF-based web of "Linked Data" that is rapidly growing up around scientific data, government open data and the academic world. I'm not going to go into the benefits of Linked Data in this post, but I will disclose that I work for a company that uses RDF as a common data model to enable loosely coupled integration across our web application products (see also Jazz Integration Architecture  and OSLC ). We'd like to be able to integrate with OpenSocial services in the same ways.
I'll explain the basics of RDF. RDF is way to model web data and ways to represent that data in XML, JSON, Turtle, etc. The RDF data model is simple, we have resources identified by URIs and property values associated with those resources. Resources can have types, each type is identified by a URI. Property types have URIs too. Once you have defined your data model in terms of RDF types and properties, you can represent resources and their properties using RDF representations. There's RDF/XML for XML, there's RDFa for embedding properties in HTML. There's are JSON representations too, but not a standard for JSON yet.
So, to bring OpenSocial in-line with the world of Linked Data, we would define each class of OpenSocial objects as an RDF type, with a URI. We would define each OpenSocial property as an RDF property, with a URI. In some cases, we'll want to use existing properties, like the Dublin Core title, name, etc., and in some cases we'll want to define entirely new types and properties.
As a starting point, I think we would do the following:
* In OpenSocial v2, we would define all OpenSocial objects and properties as RDF types in the OpenSocial Specs. This means simply assigning a URI to every class and every property we define, using standard properties where appropriate and defining new ones as needed. Object and property names would rename the same and we'd have what is essentially an RDF mapping built into the spec. Existing OpenSocial representation formats would stay the same, but we'd add some new RDF representations.
* We'd introduce an optional new OpenSocial spec that services MAY implement: the OpenSocial RDF Specification. The specification would simply require that a service provide RDF representations of it's resources via content-negotiation. The service could offer RDF/XML or HTML with RDFa, JSON/RDF or all of the above.
That's a starting point and I think we could come up with some other ideas if we thought more about use cases. Anybody else interested in aligning the worlds of OpenSocial and Linked Data?
Here's summary of last week's OpenSocial State of the Union, including news of two new board members: Cody Simms from Yahoo and Jason Gary from IBM:
Mark Weitzel (on behalf of the OpenSocial Foundation): The event started off with introductions of the Foundation Board members and officers. Cody Simms is Yahoo!s corporate designate. IBM is a new corporate member and has designated Jason Gary as their representatives. Welcome Cody and Jason. The complete list of your Foundation Officers and Board Members is in the FAQs.
In addition to new corporate members of the OpenSocial Foundation Board, there are two community seats available. Anyone is able to serve on the board. The only requirement to nominate or hold the position is that you must be a member of the OpenSocial Foundation. There are no membership fees to join OpenSocial. All you need to do is fill out a simple on-line membership application.
Its been an exciting year and a half for OpenSocial! Weve seen continued adoption of the specification as new containers come on line. Perhaps what is more interesting is that we are starting to see OpenSocial adoption outside of traditional social networks. This includes adoption by enterprise vendors such as Jive, Atlassian, and IBM.
IBM is going to be at Google I/O again this year, talking about OpenSocial and giving demos of new OpenSocial features in IBM products. Randy Hudson of IBM/Rational will be there to show how OpenSocial Gadgets can be used in Jazz-based product dashboards (introduced in Jazz Foundation 3.0 Milestone 5).
And IBM's Mark Weitzel, who happens to be an officer of the OpenSocial Foundation, will participate in panel discussion on Best practices for implementing OpenSocial in the Enterprise.
Best practices for implementing OpenSocial in the Enterprise
Social Web, Enterprise - Mark Weitzel, Matt Tucker, Mark Halvorson, Helen Chen, Chris Schalk
Enterprise deployments of OpenSocial technologies brings an additional set of considerations that may not be apparent in a traditional social network implementation. In this session, several enterprise vendors will demonstrate how they've been working together to address these issues in a collection of "Best Practices". This session will also provide a review of existing challenges for enterprise implementations of OpenSocial.
Session type: 201
Attendee requirements: General understanding of OpenSocial technologies. Some Enterprise experience is also recommended.
Tags: OpenSocial, Enterprise
Date: Thursday May 20
Here's another thing I've been involved with at IBM: the Enterprise OpenSocial white paper which was published just before Christmas 2009.
The paper is a group effort, written by folks from Alfresco, Atlassian, Cisco, Cubetree, Google, IBM, SAP and SocialText. It explains why OpenSocial is relevant and "ready for both Internet scale web communities and enterprise applications." It also lays out some specific areas for improvement in OpenSocial that will make the technology an even better fit in the enterprise. Here's the opening paragraph to get you started:
Enterprises are collections of people, and thus inherently social. Employees of any organization benefit from social connections, group affiliations and relationships both within their own business and between other businesses. As a result, social networking capabilities have become increasingly popular in business-to-consumer, business-to-business, and internal enterprise collaboration applications. New technologies and standards such as Web 2.0 and OpenSocial  are helping software providers better model relationships between people, allowing end-users to benefit from such relationships in day-to-day business processes within their own enterprise, and across business networks.
Read the rest of the Enterprise OpenSocial white paper at OpenSocial.org.
It's been over a month since the Enterprise 2.0 OpenSocial panel and since we were never able to get a group blog post together, I've decided to publish a short summary of what I said about IBM on the panel. I'm paraphrasing myself from memory so this is not exactly what I said but it should be pretty close:
IBM has been successfully innovating in the area of browser-based components, also known as widgets or gadgets, and social APIs for years now. If you haven't seen the IBM Mashup Center you should visit the IBM booth and take a look at the demo. It allows you to create Web 2.0 style mashup applications by dragging-and-dropping widgets into place and wiring them together. You've probably heard of Lotus Connections. Connections is IBM's social software suite and it includes blogs, wikis, forums, social bookmarking and more. Each one of those components features a comprehensive AtomPub-based REST API.
We're working with the OpenSocial community to ensure that the specification meets the needs of our customers and is able to interoperate with our existing iWidget technology (and I think I mentioned the OpenAjax Hub here too). You can see most of the improvements that we're interested in the slides, so I won't go into detail now, but I will mention a couple of things for example: we would like to see better inter-gadget communication, specification modularity (coming in OpenSocial 1.0) and a stable and predictable specification change process.
I work for Rational, the part of IBM that creates tools for software development and delivery, something that is also social and collaborative in nature. We're enthusiastic about OpenSocial and we hope to enable use of OpenSocial Gadgets in Jazz-based product dashboards sometime in 2010. We may also support some of the OpenSocial Social APIs, but we are still learning and experimenting. Jazz products are developed in an open and transparent way so you can track our progress via our wiki and work-items at Jazz.net.
I won't try to paraphrase what the other panelists said, I'll let them do that, and I'll leave out my SocialSite pitch for now as most of my readers have already heard it. I'll put together an update on SocialSite during the next month and I think I'll have some good news to report.
The early-bird special ends on August 14, so you'd better get moving.
Sign up for ApacheCon US by 14 August and save up to $500!
This year's ApacheCon US promises to deliver our most extensive program to date, and largest anticipated gathering of the global Apache community to celebrate the ASF's milestone 10th Anniversary. The San Francisco Bay Area is where the very first ASF official user conference was held, and we hope that you will join us in celebrating the ASF's success!
Apache members, code contributors, users, developers, system administrators, business managers, service providers, and vendors will convene 2-6 November in Oakland, California, for a week of training, presentations, sharing and hacking. ApacheCon US 2009 features new content tracks, MeetUps, and GetTogethers, as well as a number of events open to the public free of charge, such as the Hackathon and 2-day BarCampApache, in appreciation of their support over the past decade.
Be sure to register by 14 August to save up to $500! To sign up, visit http://www.us.apachecon.com
I took a break from blogging during my first couple of weeks at IBM. My blog broke and it took me a while to find the time and motivation to fix it, but now it's time to return. I think. I have been doing some internal blogging at IBM, but so far it's been mostly boring stuff: status reports and the like.
What I want to talk about today is Project SocialSite. Since my last post, where I mentioned that Sun is willing to contribute SocialSite to Apache, I did some work to move things along. I wrote an Apache Incubator proposal, started a discussion and this week calling for a vote on the proposal. Here are the relevant links:
If you want to support the project, and especially if you're on the Incubator's Project Management Committee, now's the time to do so.
I'm going to be following up my OAuth everywhere! post, with several more OAuth related posts this week. So, just in case you are wondering "why is Dave going off on this cockamamie OAuth tangent?", I'll take some time now to explain a little about OAuth to help you understand.
OAuth is a emerging protocol that one web site can use to access your data on another website without asking you to reveal your username and password. For example, when the sinister BuddyNet9000(TM) Social Network site wants to access your GMail account so it can spam your "friends" on your behalf, you can use OAuth to give it access without telling it your username and password. Why risk your GMail security when all you want to do is spam some people? There are less snarky examples, but that one makes the point well, I think.
There's a good end-user oriented introduction on OAuth.net titled Beginner's Guide to OAuth: Protocol Workflow. OAuth is not that widely deployed yet, and is not perfect, but it is emerging and going the IETF standards route.
I'm interested in OAuth because it's part of the OpenSocial spec, used to authorize access to the OpenSocial REST API and to enable OpenSocial Gadgets to call out to OAuth protected resources. Also, because it's used to protect AtomPub-based services, including the Google Data APIs. I needed to learn about it for my Roller and SocialSite work and if you're going to be doing much OpenSocial work, you'll need to learn about it too.
I'm off to ApacheCon EU 2009> tomorrow in Amsterdam to speak on the topic of Shindig for Blogs and Wikis. I'm really looking forward to catching up with my Apache friends and colleagues. That's the conference venue in the photo on the right, the Movenpick hotel (in the background behind the music hall).
I'm staying a couple of extra days, so I hope to have time for bicycling around the city as I've done in the past (see also: Flickr photo sets for 2007 and 2008). Unfortunately, the weather forecast stinks. There's a 60% chance of rain every day that I'm in town. Oh well; guess I'll have plenty of time for blogging.
Speaking of blogging.This week, I'll be posting some blog entries to highlight the work that I've done in preparation for my talk. Here's what I plan to cover:
* Monday: OAuth for AtomPub in Roller
* Tuesday: OAuth for ROME Propono
* Wednesday: SocialSite on rollerweblogger.org
* Thursday: OAuth everywhere (continued)
* Friday: the future of Project SocialSite
If you plan to attend my talk, at 4:30PM on Friday March 27, then you should follow along. Pay special attention to the SocialSite on rollerweblogger.org and OAuth everywhere (continued) posts, which will include detailed background info. I'm looking forward to seeing you there.
I started a new blog on this site to explore what's possible with Google Friend Connect (GFC). It's called the G Friend Connect blog. I've added the GFC Members Gadget and I replaced Roller's built-in comment macro with the GFC Wall Gadget. In theory, if you have a Google, Yahoo or Open ID account, you should be able to login via a gadget, make friends with other site members and leave comments. If you have a minute or two, try it out. Join the site and leave a comment. That will give me (and you) a better idea of how things work.
So far I'm not particularly impressed with the Wall Gadget as a comments replacement. Here is an example. It doesn't support rich-text editing, no HTML is allowed, the comment area is too small and there's no preview button. Maybe that's why it's called a Wall Gadget rather than a Comments Gadget. Or maybe I'm just not doing it right.
The day before the layoff axe fell at Sun, I blogged about my upcoming Shindig for Blogs and Wikis talk at ApacheCon EU in March. Since then, I've been working almost non-stop on finding a new gig and have had little time to work on my presentation. That's not good, because I have fairly ambitious plans for this talk. I'll explain.
I want to be able to show how to add social features including OpenSocial support to a blog server and a wiki server by using plain old Shindig and then Project SocialSite. I'm targeting Roller and JSPWiki because they're the blog and wiki source code bases that I know best right now and they're both Apache efforts, but the same techniques should work with other systems like Wordpress or Drupal. If I have time I might be able to demo those too (but I wouldn't count on it).
I'm not sure how far I can go with plain old Shindig because, like most blog and wiki servers, neither Roller nor JSPWiki has detailed profile data, social relationships or activities. I should be able to get Google Gadgets working via Shindig, but OpenSocial Gadgets will take a lot more thought and effort.
I'm much more confident in the Project SocialSite approach. SocialSite provides for storage of detailed profile information, groups, activities and app data as well as the necessary UI. I'm confident enough that I'm going to deploy it on this site. So, stay tuned. I hope to have something to show by the end of next week.
Oh, and by the way. Today is the last day to register for ApacheCon EU with the early-bird discount. So sign-up already!
I'm always happy to see Google talking about Project SocialSite in their OpenSocial presentations and pitches. We need all the help we can get with getting the word out.
Now, Rajdeep Dua of Google Developer Relations has put together a 25 page presentation on Project SocialSite Architecture with data model diagrams, UML and lots of detail. Good stuff. I posted some comments and corrections to the Shindig-dev mailing list