A proposal for a conceptual “Open Stack”

Last summer, John McCrea and Joseph Smarr put together a diagram of the “open stack”. The image showed up in numerous talks throughout last year, culminating in an Open Stack Meetup in December. Last week, Marc Canter sent an email asking for thoughts on crafting a new revision to the “open stack” graphic. I’d like to propose a new stack based on the underlying concepts rather than the specific, possibly obsolete technology.

Here’s the open stack graphic from summer 2008:

The Original Open Stack

The Original Open Stack

Here’s the problem: how do I read this? If I’m an average businessperson or developer who has never read a spec, how do I know what these terms mean? Some of the ideas are in there … ID, Auth, Contacts … but others don’t make any sense. XRDS-Simple? My eyes start to glaze over - that doesn’t seem all that simple. I have to lean over to my friend and ask him what all these things mean.

Technology changes.

The technologies involved here change rapidly. In just the past six months, we’ve added draft specs for PortableContacts, ActivityStreams, OpenID / OAuth Hybrid, and OpenID User Experience. These are all draft specs, which means they will change (some more than others) in the near future. Other specs, like XRDS-Simple, are actively being deprecated in favor of newer versions, like LRDD. And the work is far from done - there will likely be even more specs developed and revved before the whole thing really starts to gel.

Do we really want every version of this graphic to be out of date shortly after it’s released? Or do we want something that is compelling, demonstrates the vision, and gets people thinking about how to do it themselves? We should use the underlying concepts to communicate ideas instead of specific technologies.

The "Real" Open Stack .. of papers.

For an example of a different approach, I looked at the messaging around Facebook Connect. A developer who’s deciding whether to implement Connect will see the three main benefits: Identity, Friends, and Feed. Sure, it’s much more complicated under the covers, and sure there are some pieces that aren’t covered (lots, actually), but those are the main points that everyone should think about. They will go home and think: “How can I fit each of these pieces into my own website?”

This is the Facebook Connect stack

The Facebook Connect value stack.

The “open stack” embodies a similar set of concepts, but they aren’t entirely the same. for example, to participate with a many-to-many decentralized web made up of open standards, Discovery becomes a really important element. Someone who views the diagram should be able to tell what’s going on without having to look up a bunch of terms or be involved with the community. They should also be able to immediately understand most of the terms, and apply them to their own use cases.

Here’s my proposed conceptual open stack:

Proposed new "concept" open stack

A conceptual open stack.

Let’s stack it up, with the highest-level concepts on top and the foundations for those concepts on the bottom. Thus we have:

  • Streams. Read recent activities that people are doing around the web. Can be implemented with Atom, RSS, or the newer ActivityStreams.
  • Friends. Get information about people you are connected to. Alternately, this could be called Contacts, although I think that word tends to turn people off since they think it means contact information (which it doesn’t always). Can be implemented with PortableContacts, the OpenSocial “People and Friends” API.
  • Identity. How does someone prove they are who they say they are? This one is solidly covered by OpenID.
  • Profile. All the information that goes along with an identity - name, profile picture, birthday, whatever. There are a bunch of ways of getting this, and it hasn’t really settled yet. The most popular now are OpenID Simple Registration and OpenID Attribute Exchange. Another possibility is to use the OpenSocial “People and Friends” API with the OpenID-OAuth hybrid (although to my knowledge nobody has implemented this yet).
  • Authorization. Allow someone to have access to private data. Alternately, this could be called Privacy. The open standard for authorization is clearly OAuth.
  • Discovery. In a decentralized system, we need a way to figure out where everything is. As we get more and more providers and consumers, a smooth discovery process becomes ever more important. It has hopped around, from simple link tags in OpenID 1.1, to XRDS-Simple in OpenID 2.0. Now Eran Hammer-Lahav is working on a Link-based discovery mechanism, which will hopefully replace the other forms of discovery going forward.

As you can see, the world of the open stack is constantly changing, but the underlying concepts are maturing. We should ask people to think about how they can apply the concepts to their own business or project, rather than asking them to check off a bunch of arcane technology names.

I’m sure that lots of people have thoughts on this. Let me hear ‘em!

16 Responses to “A proposal for a conceptual “Open Stack””

  • Allen Tom Says:

    Do you think there should be a Messaging layer in the stack? Sites and Connections should be able to communicate with you, and email is awful.

  • Luke Shepard Says:

    Sure, Messaging belongs conceptually. But besides email, are there existing open standards for messaging? I guess Jabber could make sense.

  • Johannes Ernst Says:

    Here is my version of this diagram. I call it “Open Identity Stack” and it has fewer layers than your’s ;-)

  • Bertil Hatt Says:

    I made a different classification, based on how Facebook introduce their own ideas, that make more sense — and actually justify why some have to be below other in a graphical way. I still need to find a way to include Meta-tags in there, but I’ll be sure to send you a link when I’m done.

  • Luke Shepard Says:

    Johannes, I like yours because it strives to be an actual “stack” - like a technology stack. However, I don’t think these concepts *really* work together into a stack all that easily- they are all approximations. I also don’t really like putting “Mashups” at the top- that word makes me think of simple data widgets, instead of the full-featured applications that should be living at the top. (For example, would you list the New York Times as a “mashup”?)

    Also, mine has fewer “things” even if I chose to stack them in more layers :)

    Finally, how would you update yours to incorporate Streams?

    Bertil, I’m interested to see yours when it’s ready

  • Chris Messina Says:

    Weird, I’m logged in with BOTH Facebook and Friend Connect! Ha!

    So, what do you think of my blimp?

    Detail: http://www.flickr.com/photos/factoryjoe/3341539323/

  • Luke Shepard Says:

    Ha, I was playing around with the plugin but as you point out, it’s pretty inconsistent to have both up there at once. I’ll take it down until I can figure out how to do both.

  • Allen Tom Says:

    Email sucks because anyone with your email address can send you mail. In an ideal world, someone would be able to send a message to your OpenID, and your Open Stack Provider would determine who the sender is and route the message to the communication channel of your preference.

    This also assumes that the sender can be authenticated. I would imagine that users would have a Messaging Service that is OAuth protected. The Messaging Provider would determine if the sender is authorized to send messages to the user, and could possibly apply sorting roles to the message depending on the recipient’s relationship to the sender. The message could be routed to the recipient’s email address, cell phone, IM, or whatever, based on the recipient’s preference.

    If I remember correctly, I think you blogged about something similar, so this is not exactly all that new. :)

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