Some progress on a SPARQL engine

I figured out how to get a graph pattern to resolve to a list of bindings, so the core of what will hopefully be a SPARQL processor for Wilbur is proceeding:

* (present-results 
    (graph-pattern-run 
      (compile-graph-pattern
        '(graph-pattern (triple x !foaf:knows y) 
                        (triple x !foaf:name name))) 
    *db*))
Result 1:
  X         |   !rich:Anthony
  Y         |   !rich:John
  NAME      |   "Anthony"
-----
Result 2:
  X         |   !rich:Richard
  Y         |   !rich:Anthony
  NAME      |   "Richard"
-----

The code is much lighter-weight than I expected; less than 200 lines with heavy comments and docstrings, and planning for the future. Next up are optionals, unions, and so on, culminating in a proper s-expression SPARQL processor. All that's left after that is a parser….

Posted at 2005-06-15 16:17:12 by Richard • Link to Some progress on a…

Cool things

A Unix in Javascript. Wow.

The net-casting spider. It doesn't make a web like a normal spider, it makes a net, then throws it on its prey. Awesome.

I'm rather frustrated about finding accommodation in the United States, and a number of other things besides. It's a remarkable amount of effort, and the US Embassy certainly don't make my life any easier! Still, it should be worth it.

Posted at 2005-06-15 12:13:43 by Richard • Link to Cool things

iPod to car stereo

VR3 FM Modulator. Looks brilliant. $35.94. Why don't they ship to the UK? I'd buy one.

Maybe I'll send them an email. Or maybe I'll get one when I'm in the US.

Update: they're on eBay. Search for “fm modulator”. £27 not too bad (you get stung on shipping), but hey. I'll let you know if it's any good!

Posted at 2005-06-15 10:43:20 by Richard • Link to iPod to car stereo