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Subject: Proposal for Alternate oBIX Encodings
Today oBIX defines an abstract object
model with a single encoding based on XML. But the original vision behind
oBIX was that multiple encodings could be defined all sharing the same
interoperable object model. I would like to propose adding two alternate
encodings of the oBIX object model to the 1.1 draft specification: JSON and
Binary. One of the things we are starting to see
is many people are using oBIX as an AJAX data feed to their browser. In
this use case, it is preferable to deliver the oBIX information directly in a JSON
format rather than requiring JavaScript to parse the XML into a usable format. Why a binary oBIX encoding? This requirement
takes a little more background discussion. One of the technologies I have
been deeply involved in is 6LoWPAN which is an RFC specifying how to run IPv6
over 802.15.4 wireless networks. I firmly believe that 6LoWPAN has the potential
to unleash the Pervasive Internet by adding billions of new nodes to the
Internet. But putting these devices onto the Internet is just the first
step. The next step is to put them onto the Web so that they can be wired
into humanities existing information infrastructure. Due to their
resource and power constraints, 6LoWPAN devices cannot fully run HTTP or mange XML
payloads. To the solve the HTTP problem, I am working on an RFC to run a compressed
version of HTTP over 6LoWPAN. On the payload side, oBIX fits
perfectly for defining a RESTful information model. But we need a compact
encoding which can work with the small packet sizes required for 802.15.4 networks.
I have some good ideas on how to achieve this without loosing any of oBIX’s
modeling capability. Clients would perform negotiation with
servers for their preferred encoding using the Accept header (standard HTTP content
negotiation). Comments? I would suggest we try to setup a
teleconference next week (Mon or Tue preferably) to discuss this strategy. Brian |
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