arc2 (3 out of 3)

ARC2 SPARQL Endpoint

So Slog'd got stuck for a little while because the fast, nice-looking, somewhat magical SPARQL endpoint provided by ARC2 stopped working for no discernable reason.

I thought I'd try leaving it alone for a few weeks to see if it started working again by itself, but alas, it has not.

Everything is fine until I try to query for a specific predicate. (Specific objects or subjects are fine). The query runs, it just returns no results. I know the data is in there, because I can get it out with less specific queries. Also because I can see it all in the MySQL database on which it is based. When I left it, it was working fine.

I'm going to kill the database and set it up again.

I did this by - and oh, it was joyous - going into the database settings and appending '2' to the name of the database. I then reloaded the endpoint page, and it set everything up by itself :)

I inserted two triples, and successfully queried for a specific prefix. So, it works. I wonder what will happen if I dump all my old data back in there? (I validated the raw file with all the triples in RDF/XML, and they're fine).

I inserted the rest the rest: LOAD <path/to/rdf.rdf> INTO <>

Ran a test query, aaaand... it's fine.

So what the hell was wrong with my other database? Perhaps I'll never know...

🏷 http://vocab.amy.so/blog#Doing http://vocab.amy.so/blog#Doing arc2 blog hacking learning rdf semantic web slogd sparql triplestores

Thu 1st of May 2014 at 7:38pm (+00:00)

Graphite

I think I'll use Chris Gutteridge's Graphite layer on top of ARC2. I've been putting off thinking about yet more libraries, but I think I'll end up implementing bits of Graphite in an effort to make ARC2 more friendly anyway, and I'm sure he's done a better job than I ever could.

🏷 http://vocab.amy.so/blog#Doing http://vocab.amy.so/blog#Doing arc2 chrisgutteridge graphite hacking learning php semantic web slogd triples

Fri 25th of October 2013 at 4:32pm (+00:00)

Metadata parsing

Right-ho, it parses whatever arbitrary metadata I put in the comments of the markdown files providing they start with "label:" and end with a newline (" ").

And lumps it into displayable html along with the post it belongs to, mostly for easier testing.

The next step is to engage some ontologies and turn the metadata and posts into a graph. It's ARC2 time!

Update: Actually the metadata it accepts is not all that arbitrary. Will remedy.

Update 2: Fixed that.

🏷 http://vocab.amy.so/blog#Doing http://vocab.amy.so/blog#Doing arc2 blog hacking learning markdown metadata semantic web slogd

Sun 13th of October 2013 at 9:20pm (+00:00)

Last modified: Sun 13th of October 2013 at 9:53pm (+00:00)