Hi,
I'm trying to have Fuseki serve whole graphs with the SPARQL HTTP Graph
Store Protocol, i.e. it should respond to HTTP GETs using a URL such as
/ds/data?graph=http://example.org/my-graph
It does give me the data, but it will not give me the right namespace
prefixes. In previous correspondence about namespace prefixes on the
list [1] and elsewhere [2] it has been said that TDB will pick up
prefixes from the data, but I can't get that to work. Fuseki will only
give me prefixes such as j.0.
I'm using jena-fuseki-0.2.6-SNAPSHOT from a few days ago.
I've tried three different ways of setting up Fuseki and loading the
data. I'm using the Fuseki stock config.ttl file as a test data set,
because it contains several namespace prefixes such as fuseki: and tdb:.
A: In-memory model loaded directly from the file at startup:
./fuseki-server --file config.ttl /ds
B: In-memory model updated via HTTP PUT:
./fuseki-server --update --mem /ds
./s-put http://localhost:3030/ds/data default config.ttl
C: File-backed model updated via HTTP PUT:
mkdir DS
./fuseki-server --update --loc DS /ds
./s-put http://localhost:3030/ds/data default config.ttl
After each of these, I've tried accessing the graph at
http://localhost:3030/ds/data?graph=default
I get back the triples, but not the correct namespace prefixes, like this:
--snip--
<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#";
xmlns:j.0="http://jena.hpl.hp.com/2005/11/Assembler#";
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#";
xmlns:j.1="http://jena.apache.org/fuseki#"; >
<rdf:Description
rdf:about="http://localhost:3030/ds/data?default#emptyDataset";>
<rdf:type
rdf:resource="http://jena.hpl.hp.com/2005/11/Assembler#RDFDataset"/>
</rdf:Description>
--snip-- (omitted the remaining data)
My question is, isn't Fuseki/TDB supposed to pick up the prefixes, store
them in the in-memory or TDB store, and then use them in the reply to
the HTTP GET request? Why isn't that happening?
-Osma
[1]
http://mail-archives.apache.org/mod_mbox/jena-users/201108.mbox/%3c4e40f3b5.3020...@epimorphics.com%3E
[2] http://tech.groups.yahoo.com/group/jena-dev/message/47330
--
Osma Suominen | osma.suomi...@aalto.fi | +358 40 5255 882
Aalto University, Department of Media Technology, Semantic Computing
Research Group
Room 2541, Otaniementie 17, Espoo, Finland; P.O. Box 15500, FI-00076
Aalto, Finland
