One more information. Today I tried from scratch, reinstalling Marmotta, creating the end-point from the load sample. And then querying "http://dbpedia.org/resource/Europe"; with LDPath. LDPath result was: resource http://dbpedia.org/resource/Europe does not exist But I had one error message in the console:
07:38:52.962 ERROR - the HTTP request failed (status: HTTP/1.1 406 Unacceptable) 07:38:52.963 ERROR - HTTP client error while trying to retrieve resource http://dbpedia.org/resource/Europe: the HTTP request failed (status: HTTP/1.1 406 Unacceptable) After that I tried again, but this message didn't come up again. I don't think it comes from some firewall settings we have internally, but I'll check about that. Thank you for any help Fabian >>> "Fabian Cretton" <[email protected]> 08.09.2014 15:50 >>> Hi, Today I tried without success to setup the LDCache from the Marmotta interface. A first thing is that it is not clearly stated, in my opinion, when the LDCache is triggered. The only further information I found was here: http://markmail.org/message/m3ft65du5kbuzy5z#query:+page:1+mid:j347sjyegwshvhc7+state:results and thus I understood that the SPARQL interface don't interact with LDCache, but the LDPath functionality does. Is there anything else then running a LPath that would trigger the cache ? First of all, I see this error when launching Marmotta 3.2.1, could it be related to my problems ? INFO: Server startup in 11332 ms 15:25:45.495 WARN - pattern (C:\marmotta_inst\marmotta-home/resources|http://wh55650:8080/marmotta/resource/|urn:).* is not a valid regular expression; disabling reader/writer filesystem (message was Illegal/unsupported escape sequence near index 4 (C:\marmotta_inst\marmotta-home/resources|http://wh55650:8080/marmotta/resource/|urn:).* ^) My "ldcache.enabled" parameter is checked. I guess my problem is with setting up the end-point correctly. I first tried the provided sample "load sample -> dbpedia", which gives in the interface: kind: ld cache Prefix: http://dbpedia\.org.* Endpoint: http://dbpedia.org/sparql But a few things are already not clear for me: * kind: ld cache When referring to a sparql end-point, shouldn't the kind be "sparkl" ? (I did try changing this, but with no success) By the way, what is the meaning of the "cache" mode, I can't understand from reading the explanation. Is it a server that servers "linked data" ? if so, what is the difference with "linked data". * prefix: What are the "rules" to define those prefixes ? for instance I see in the example that "." are escaped ? Defining a prefix as "http://dbpedia\.org ( http://dbpedia/.org ).*" will thus mean that a URI as http://dbpedia.org/resource/Europe is bound to that end-point, right ? *endpoint: The explanation says that for a SPARQL end-point, some parameters have to be specified: "http://sparql.sindice.com/sparql?default-graph-uri=&query={query}&format={contenttype}"; Is this mandatory ? (as the provided sample don't specify them but just specifies "http://dbpedia.org/sparql";), are there default values ? *mimetype: Not filled by the sample, are their default values depending on the "mode of operation" ? If it is possible to get a few full examples of those settings, for the different operation modes, it would be very helpful I guess. Than, after trying different configurations, I tried from the LDPath interface to add the URI "http://dbpedia.org/resource/Europe"; and the LDPath "rdfs:label :: xsd:string". When hitting "Test", a message appears next to the button: resource http://dbpedia.org/resource/Europe does not exist. It seems I don't see any corresponding message neither in the console nor in the marmotta-main.log. I tried so many different configurations, on different SPARQL end-point, also trying a "linked data" as DBPedia does provide the content negociation mecanism, but without success. Finally I tried to run a: curl http://wh55650:8080/marmotta/cache/live?uri=http://dbpedia.org/resource/Europe and it did return the rdf/xml file. But what I discovered then is that even without configuring any 'end-point' in Marmotta, this command was succeeding every time, so I think this command is not a sign that my end-point is well configured ? Except maybe if I was dealing with data that are not provided as derefencable "linked data" ? I also tried on my local version 3.3.0, but with the same results. And also with the same WARNING when starting Marmotta. Thank you for any help. Fabian
