Named graphs

If I've read the W3 standards correctly, labels for graphs must be IRIs. Jena also seems to enforce this behaviour, as it throws an exception if I use a literal. My question is, why is this enforced at all? Why can't I name my graphs with literals, for example "graph-1" or "graph-2"? And related

Re: Named graphs

Hi Laura If you're asking "why did the W3 decide that graph names must be absolute IRIs?" then this is probably not the best forum to ask, but anyway ... One reason is so that absolute IRIs can be used as part of the WWW; graph names may actually resolve to serializations of the graph content. Th

Re: Named graphs

Thank you for the great response. == Subject: Re: Named graphs Hi Laura If you're asking "why did the W3 decide that graph names must be absolute IRIs?" then this is probably not the best forum to ask, but anyway ... One re

Re: Named graphs

will have pretty strong effects on your ability to refer to named graphs from other contexts than the one in which you created them. On the other hand, as the same recommendation says just a bit later: "SPARQL 1.1 Query Language only allows RDF Graphs to be identified using an IRI." h

tdbloader2 named graphs

Hi all, I’m trying to use tdbloader2 to import multiple ttl files into DB. I want (the triples from) certain files to go to certain named graphs, but I don’t know how to specify that – it all goes to the default graph. Does anybody know? Regards, Stefan

nested named graphs

Hi, I am getting myself familiar with named graphs and with the possibility to include subgraphs into the data. I saw a couple of examples demonstrating signing chains that include nested graphs like this (in Trig format): @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax

Inferred Named Graphs

Hi,,I am justwondering if this scenario is correct or not. I have a TDB dataset containsseveral named graphs and I would like to apply reasoning on all these namedgraphs. I will apply the following steps:1-    Loading the named graphs into models one by one. 2-    Applying reasoning on every

many named graphs

Hi All, How many named graphs can Jena gracefully handle? Hundreds, thousands, millions? I've found references to Jena handling large triple stores, with billions of statements; but nothing about how many named graphs. I'm writing a system where I'm considering giving each re

Re: tdbloader2 named graphs

Figured it out – gotta convert my .ttl files to .trig format … S. From: Stefan Dimov Date: Friday, January 5, 2018 at 3:31 PM To: "users@jena.apache.org" Subject: tdbloader2 named graphs Hi all, I’m trying to use tdbloader2 to import multiple ttl files into DB. I want (the tr

Re: tdbloader2 named graphs

ot;users@jena.apache.org" Subject: tdbloader2 named graphs Hi all, I’m trying to use tdbloader2 to import multiple ttl files into DB. I want (the triples from) certain files to go to certain named graphs, but I don’t know how to specify that – it all goes to the default graph. Does anybody k

Re: tdbloader2 named graphs

d it out – gotta convert my .ttl files to .trig format … > > S. > > From: Stefan Dimov > Date: Friday, January 5, 2018 at 3:31 PM > To: "users@jena.apache.org" > Subject: tdbloader2 named graphs > > Hi all, > >

Re: nested named graphs

On Fri, Jun 20, 2014 at 10:34 AM, Yana Panchenko wrote: > Hi, > > I am getting myself familiar with named graphs and with the possibility to > include subgraphs into the data. I saw a couple of examples demonstrating > signing chains that include nested graphs like this

Re: nested named graphs

On Fri, Jun 20, 2014 at 10:58 AM, Joshua TAYLOR wrote: > On Fri, Jun 20, 2014 at 10:34 AM, Yana Panchenko > wrote: >> Hi, >> >> I am getting myself familiar with named graphs and with the possibility to >> include subgraphs into the data. I saw a couple of exam

Re: nested named graphs

eff: Re: nested named graphs On Fri, Jun 20, 2014 at 10:58 AM, Joshua TAYLOR wrote: > On Fri, Jun 20, 2014 at 10:34 AM, Yana Panchenko > wrote: >> Hi, >> >> I am getting myself familiar with named graphs and with the possibility to >> include subgraphs into the d

Re: nested named graphs

On Fri, Jun 20, 2014 at 11:29 AM, Yana Panchenko wrote: > Yes, that's page I found the example. There, G2 is a graph that contains > triples describing the signature of G1 and G1 itself as nested graph (the > latter you omitted from the example in your reply). It not clear to me how > should I rep

Re: nested named graphs

thanks, you comments are very helpful Von: Joshua TAYLOR An: Yana Panchenko CC: "users@jena.apache.org" Gesendet: 17:48 Freitag, 20.Juni 2014 Betreff: Re: nested named graphs On Fri, Jun 20, 2014 at 11:29 AM, Yana Panchenko wrote: > Yes,

Re: Inferred Named Graphs

On 05/05/16 19:32, Abduladem Eljamel wrote: Hi,,I am justwondering if this scenario is correct or not. I have a TDB dataset containsseveral named graphs and I would like to apply reasoning on all these namedgraphs. I will apply the following steps:1-Loading the named graphs into models

Re: many named graphs

Hi Chris, It is possible. In fact, I have loaded 57 million of named graphs and then queried without problem. You can see the details in http://users.dcc.uchile.cl/~dhernand/research/ssws-2015-reifying.pdf Daniel El 04/07/16 a las 19:21, Chris Jones escribió: Hi All, How many named graphs

Re: many named graphs

uot;, to create multiple Named Graphs based on the value of "user _number"? Thank you for help... Al  On Monday, July 4, 2016 8:38 PM, Daniel Hernández wrote: Hi Chris, It is possible. In fact, I have loaded 57 million of named graphs and then queried without p

Re: many named graphs

created, for example, I have successfully used GRAPH qm:g1 to create a Named Graph "g1", can I substitute a variable for "g1" such as "user _number", to create multiple Named Graphs based on the value of "user _number"? Thank you for help... Al

Re: many named graphs

Daniel, Thank you, this gives me part of the answer... Can you give me an example(s) of the IRI's that you used to name your Named Graphs and how they are defined as an IRI, in Sparql?. Please withhold any proprietary info... Thank you again, Al   On Tuesday, July 5, 2016 9:55 PM, D

Re: many named graphs

I suggest that you first translate your data to RDF using an script (e.g., in Ruby, Python, etc.) to generate a text file in one of the RDF serialization formats that support named graphs (e.g., nquads). Then, you can load the data into jena using tdbloader. Daniel El 06/07/16 a las 01:10

Re: many named graphs

rmats that support named graphs (e.g., nquads). Then, you can load the data into jena using tdbloader. Daniel El 06/07/16 a las 01:10, Al Shapiro escribió: > Daniel, > Thank you, this gives me part of the answer... > Can you give me an example(s) of the IRI's that you used to name your

Re: many named graphs

Wednesday, July 6, 2016 6:45 AM, Daniel Hernández > wrote: > > > I suggest that you first translate your data to RDF using an script > (e.g., in Ruby, Python, etc.) to generate a text file in one of the RDF > serialization formats that support named graphs (e.g., nquads). Th

Re: many named graphs

ggest that you first translate your data to RDF using an script > (e.g., in Ruby, Python, etc.) to generate a text file in one of the RDF > serialization formats that support named graphs (e.g., nquads). Then, > you can load the data into jena using tdbloader. > > Daniel > > E

Re: many named graphs

to know how to generate the Named Graph based on IRI? >> Do I create a NameSpace for the IRI? >> Please give me an example... >> Thank you, >> Al >> >> On Wednesday, July 6, 2016 6:45 AM, Daniel Hernández >> wrote: >> >> >> I suggest t

Re: many named graphs

NameSpace for the IRI? Please give me an example... Thank you, Al On Wednesday, July 6, 2016 6:45 AM, Daniel Hernández wrote: I suggest that you first translate your data to RDF using an script (e.g., in Ruby, Python, etc.) to generate a text file in one of the RDF serialization formats that

Re: many named graphs

>> I need to know how to generate the Named Graph based on IRI? >>> Do I create a NameSpace for the IRI? >>> Please give me an example... >>> Thank you, >>> Al >>> >>>      On Wednesday, July 6, 2016 6:45 AM, Daniel Hernández >>>

Named graphs and inference

Is it possible to configure Fuseki to run inferences across named graphs and have the triples, including the inferred triples, appear in the default graph? In my attempt to do this, included below (along with the triples I'm testing with), I have a configuration that will run the inferenc

Copy triples in named graphs

Hi, is it possible to copy all data from one Jena instance to other which is running and containing data already? So I want to dump all NQuads (triples in named graphs) in one db and insert them into other running db without affecting existing data. All I know is sparql construct which

Handling named graphs in Jena.

Dear all, This might be due to my lack of knowledge on SPARQL syntax. 1. I try to construct a named graph via SPARQL query, but it fails. so What I did is like following /// Model model = ModelFactory.createDefaultModel(); String queryStr ="CONSTRUCT {GRAPH { .} } W

Reasoner works on named graphs

cific graph data and then insert new information data frequently, and I also want to keep some basic knowledge data in the default graph. 3. In the ttl configuration file, the "tdb:unionDefaultGraph true" is set, the expected result should be the data from the union named graphs, if se

Problem inserting into named graphs

I'm encountering a problem inserting into named graphs when doing so programmatically. Pardon my clojure, but I think its intent is pretty clear, let me know and I'll translate to java-ish pseudocode: (let [model (TDBFactory/createModel (ensure-directories-exist "/home/

Text search and named graphs

Is the text search module named graph aware and capable of being configured (assembled) such that each named graph in a dataset can have its own text indexes configured separately with their own EntityMap definitions? I have a TDB dataset composed of multiple named graphs (i.e. one per 'v

transitive reasoning and named graphs

We are running into an issue trying to use reasoning with Fuseki over owl:TransitiveProperties. Our example (below) works when the triples are uploaded into the default graph but when we upload them to a named graph reasoning doesn't seem to work. (We have tried querying both the named graph and

Jena Support for named graphs

Hello, I was trying to load a toy example on named graphs approach in Jena and test it using some queries. While doing this, the syntax below didn't work for me: |ex:G rdfg:isGraph { ex:B ex:prop2 ex:C } | But instead this syntax using GraphLiteral works. ex:G rdfg:isGraph "ex:

Re: Named graphs and inference

On 26/08/2024 22:57, Scott Henninger wrote: Is it possible to configure Fuseki to run inferences across named graphs and have the triples, including the inferred triples, appear in the default graph? I don't think it's possible if you want to more complicated in the inference

Re: Copy triples in named graphs

I want to dump all NQuads (triples in named graphs) in one db and insert them into other running db without affecting existing data. POST = "add into" N-Quads will miss prefixes, if that matters. All I know is sparql construct which doesn't work here I think. Br, Mikael

Re: Copy triples in named graphs

data from one Jena instance to other which is > > running and containing data already? > > Yes - pull the data out of one store (GET) and push it into another POST. > > See the thread "Streaming data to Fuseki" > > > So I want to dump all NQuads (triples in n

Re: Copy triples in named graphs

te: Hi, is it possible to copy all data from one Jena instance to other which is running and containing data already? Yes - pull the data out of one store (GET) and push it into another POST. See the thread "Streaming data to Fuseki" So I want to dump all NQuads (triples in named grap

Re: Copy triples in named graphs

Are you sure you have named graphs in that dataset? On Mon, Nov 9, 2020 at 12:42 PM Mikael Pesonen wrote: > > > Hi, > > this command returns triplets although content-type is set as requested: > > curl -H "Accept: application/n-quads" http://localhost:3030/ds >

Re: Copy triples in named graphs

: application/n-quads" -X POST --data-binary "select * WHERE{GRAPH ?g {?s ?p ?o}} limit 5" -H 'Content-Type: application/sparql-query' http://localhost:3030/ds BR, Mikael On 09/11/2020 13.50, Martynas Jusevičius wrote: Are you sure you have named graphs in that datase

Re: Copy triples in named graphs

ot;select * > WHERE{GRAPH ?g {?s ?p ?o}} limit 5" -H 'Content-Type: > application/sparql-query' http://localhost:3030/ds > > BR, > Mikael > > On 09/11/2020 13.50, Martynas Jusevičius wrote: > > Are you sure you have named graphs in that dataset? > > >

Re: Copy triples in named graphs

t-Type: application/sparql-query' http://localhost:3030/ds BR, Mikael On 09/11/2020 13.50, Martynas Jusevičius wrote: Are you sure you have named graphs in that dataset? On Mon, Nov 9, 2020 at 12:42 PM Mikael Pesonen wrote: Hi, this command returns triplets although content-type is set

Re: Copy triples in named graphs

ql-results+xml curl -H "Accept: application/n-quads" -X POST --data-binary "select * WHERE{GRAPH ?g {?s ?p ?o}} limit 5" -H 'Content-Type: application/sparql-query' http://localhost:3030/ds BR, Mikael On 09/11/2020 13.50, Martynas Jusevičius wrote: Are you sure you have

Re: Copy triples in named graphs

cation/sparql-query' http://localhost:3030/ds BR, Mikael On 09/11/2020 13.50, Martynas Jusevičius wrote: Are you sure you have named graphs in that dataset? On Mon, Nov 9, 2020 at 12:42 PM Mikael Pesonen wrote: Hi, this command returns triplets although content-type is set as requested:

Re: Copy triples in named graphs

On 09/11/2020 14:16, Mikael Pesonen wrote: We are also using 3.16.0 Just noticed with GET there is this warning, if it's related Well, you aren't going to get an results! The connection was closed early. Client issue. 16:10:35 INFO  Fuseki  :: [125415] GET http://localhost:303

Re: Copy triples in named graphs

Sorry disconnect, not timeout. On 09/11/2020 17.05, Mikael Pesonen wrote: Okay, weird... I'm making the curl call on same server, what could cause the timeout then? On 09/11/2020 16.18, Andy Seaborne wrote: On 09/11/2020 14:16, Mikael Pesonen wrote: We are also using 3.16.0 Just not

Re: Copy triples in named graphs

Okay, weird... I'm making the curl call on same server, what could cause the timeout then? On 09/11/2020 16.18, Andy Seaborne wrote: On 09/11/2020 14:16, Mikael Pesonen wrote: We are also using 3.16.0 Just noticed with GET there is this warning, if it's related Well, you aren't going

Re: Handling named graphs in Jena.

1. You haven't followed the example. You are missing Syntax.syntaxARQ in QueryFactory.create(), I guess this makes a difference since CONSTRUCT with quads is not standard SPARQL. 2. Because INSERT is an update and not a query? Se UpdateFactory: https://jena.apache.org/documentation/javadoc/arq/org

Re: Handling named graphs in Jena.

Thanks for the answers! It solved the error. But I got a followup question... After constructing a named graph with the previous code, I tried to SELECT all the triples in the graph by the following query, and it gives nothing... / String selectQueryStr = "SELECT ?s ?p ?o where{GRAPH

Re: Handling named graphs in Jena.

On 02/11/16 02:28, Jason Koh wrote: Thanks for the answers! It solved the error. But I got a followup question... After constructing a named graph with the previous code, I tried to SELECT all the triples in the graph by the following query, and it gives nothing... / String select

Problems with SPARQL and named graphs

Hi all, I’m trying to understand how SPARQL with named graphs works within Jena, but I’m having strange results. I have defined one default graph and two named graphs. Very basic example. |Dataset dataset = TDBFactory.createDataset(tdbPath); Model m = dataset.getDefaultModel(); m.add

Re: Reasoner works on named graphs

sert new information data frequently, and I also want to keep some basic knowledge data in the default graph. 3. In the ttl configuration file, the "tdb:unionDefaultGraph true" is set, the expected result should be the data from the union named graphs, if selecting data in default. Bu

Re: Reasoner works on named graphs

er to start over and loose all the prior work so performance would be terrible. Fundamentally the current inference engines are not well suited to a world of TDB-backed named graphs :( Dave On 20/06/17 22:05, Rui Zhang wrote: Hi, I face a problem, when I try to let my reasoner work on specific

Inference and persistence for named graphs

o have inference and persistence for named graphs? I've found that some other triplestores do not, e.g. Blazegraph which supports persistence, but doesn't support inference on named graphs ("quads" in their terms). Notes: - Each partition of triples only partially shares the s

Re: Problem inserting into named graphs

On 12/06/12 02:15, Eric Scott wrote: I'm encountering a problem inserting into named graphs when doing so programmatically. Pardon my clojure, but I think its intent is pretty clear, let me know and I'll translate to java-ish pseudocode: (let [model (TDBFactory/createModel (ensure-d

Re: Problem inserting into named graphs

Argh. That's right. The ol' model/dataset distinction. Sorry about that. Thanks, On 06/12/2012 02:43 AM, Andy Seaborne wrote: On 12/06/12 02:15, Eric Scott wrote: I'm encountering a problem inserting into named graphs when doing so programmatically. Pardon my clojure,

Fuseki: Named graphs disappear after restart

wever, once I shut down and start Fuseki again, the named graphs are gone. The triples I have inserted are still there, though – sitting in the union graph. Any hints on what might be going wrong here appreciated! Thanks Carsten --- http://carsten.io

Query the union of named graphs

I'm using the in-memory Jena implementation (not TDB). How do I query across the union of named graphs?

Combining default graph with named graphs

I have a graph that is referenced 'Event1' in my default graph, with object properties "w:userFollowed" and "w:occurred".This query works: "SELECT DISTINCT ?graph ?time WHERE { ?graph w:action w:userFollowed; w:occurred ?time }" This query works as well (which is in the named graph, Event1)

Re: Text search and named graphs

a TDB dataset composed of multiple named graphs (i.e. one per 'vendor') which I would like to index using the text search module and then search using named graph semantics. Some of my SPARQL queries reference all graphs and some reference just a single graph so splitting the data into multiple d

Loading named graphs from trig files?

Hi, I attempted to load the trig example from the spec, but Jena says: WARN jena.riot: Only triples or default graph data expected : named graph data ignored What knob do I have to turn for Jena to provide access to the named graphs? Be seeing you

Re: transitive reasoning and named graphs

> <#dataset> rdf:type ja:RDFDataset ; > ja:defaultGraph <#model_inf> ; > . > > <#model_inf> a ja:InfModel ; > ja:baseModel <#tdbGraph> ; > ja:reasoner [ > #ja:reasonerURL > #ja:reasonerURL

Re: transitive reasoning and named graphs

o store do the inference on an in-memory model and then store the materialized graph in Fuseki. How does this sound to you? Thanks, Guy From: Andy Seaborne To: users@jena.apache.org, Date: 09/10/2013 06:05 PM Subject:Re: transitive reasoning and named graphs > <#d

Re: transitive reasoning and named graphs

10/2013 06:05 PM Subject:Re: transitive reasoning and named graphs > <#dataset> rdf:type ja:RDFDataset ; > ja:defaultGraph <#model_inf> ; > . > > <#model_inf> a ja:InfModel ; > ja:baseModel <#tdbGraph>

Re: Jena Support for named graphs

On 01/03/2023 13:16, Ghinwa FAKIH wrote: Hello, I was trying to load a toy example on named graphs approach in Jena and test it using some queries. While doing this, the syntax below didn't work for me: |ex:G rdfg:isGraph { ex:B ex:prop2 ex:C } | That's N3 syntax for a g

Re: Jena Support for named graphs

Thank you! On 01/03/2023 14:16, Ghinwa FAKIH wrote: Hello, I was trying to load a toy example on named graphs approach in Jena and test it using some queries. While doing this, the syntax below didn't work for me: |ex:G rdfg:isGraph { ex:B ex:prop2 ex:C } | But instead this syntax

Inference across named graphs in Fuseki

I am looking for a way to run inference in Jena Fuseki across named graphs, preferably the union graph (i.e. across all of the named graphs). Is this possible? Below I have a configuration that will successfully infer triples in the default graph, but not across the named graphs. Is there a

Re: Problems with SPARQL and named graphs

" + " FROM NAMED <http://example.org/bob>" + " WHERE " + " { \n" + " ?graph dc:publisher ?who . " + " GRAPH ?graph { ?x foaf:mbox ?mbox . } " + " }"; Take out the FROM NAMED. Adding FROM or FROM NAMED creates a view of the original data - in this case with just 2 named graphs. You don't want a view - you want the real thing. Andy

Re: Problems with SPARQL and named graphs

?mbox" >> + " FROM NAMED <http://example.org/alice>" + " FROM NAMED >> <http://example.org/bob>" + " WHERE " + " { \n" + " ?graph dc:publisher >> ?who . " + " GRAPH ?graph { ?x foaf:mbox ?mbox . } " + "

Re: Problems with SPARQL and named graphs

SELECT ?graph ?who ?mbox" + " FROM NAMED <http://example.org/alice>" + " FROM NAMED <http://example.org/bob>" + " WHERE " + " { \n" + " ?graph dc:publisher ?who . " + " GRAPH ?graph { ?x foaf:mbox ?mbox . } " + " }";

Re: Problems with SPARQL and named graphs

/example.org/bob>" + " WHERE " + " { \n" + " ?graph dc:publisher >>>> ?who . " + " GRAPH ?graph { ?x foaf:mbox ?mbox . } " + " }"; >>> >>> Take out the FROM NAMED. >>> >>> Adding FROM or FROM

Re: Problems with SPARQL and named graphs

. " + " GRAPH ?graph { ?x foaf:mbox ?mbox . } " + " }"; Take out the FROM NAMED. Adding FROM or FROM NAMED creates a view of the original data - in this case with just 2 named graphs. You don't want a view - you want the real thing. Andy But then, how can

persistent inference on named graphs in Fuseki

Hello, I am currently setting up a Fuseki server with the following specs in mind: - everything persistent in TDB (it works) - many different named graph, with the default graph being the union of them (it works, but without inference) - very simple inferencing (works but not with named

persistent inference on named graphs in Fuseki

Hello, I am currently setting up a Fuseki server with the following specs in mind: - everything persistent in TDB (it works) - many different named graph, with the default graph being the union of them (it works, but without inference) - very simple inferencing (works but not with named graphs

Re: Inference and persistence for named graphs

of the Fuseki. Is it supported by Fuseki at all, to have inference and persistence for named graphs? Short ans: no, no persistence of inferred graphs automatically. Longer ans: Fueski obviously supports persistence and named graphs through TDB, so without inference you would be fine. However, the i

Re: Inference and persistence for named graphs

uery to >> delete a specific partition of triples and leave the rest untouched. >> Therefore I tried to use a separate named graph for each partition and >> I was able to configure RDFS inference for them. >> >> But the problem is that I can't find a way to make all t

Re: Fuseki: Named graphs disappear after restart

named graph specified in the request. However, once I shut down and start Fuseki again, the named graphs are gone. The triples I have inserted are still there, though – sitting in the union graph. Any hints on what might be going wrong here appreciated! Thanks Carsten --- http://carsten.io

Re: Fuseki: Named graphs disappear after restart

and OWL-Mini >> inference (the full configuration file: >> https://gist.github.com/3990276). When I upload triples through the >> graph store endpoint, this works fine and the triples end up in the >> named graph specified in the request. However, once I shut down and >>

Re: Fuseki: Named graphs disappear after restart

docs and googling around for a whole afternoon and couldn't find any example of how to set this up. Best, Carsten You can have inference on an existing graph - it's the fact you added new (named) graphs, not altered an existing graph, that caused your disappearing data. (I hope so

Re: Query the union of named graphs

On 10/06/13 21:52, Cindy A McMullen wrote: I'm using the in-memory Jena implementation (not TDB). How do I query across the union of named graphs? Union of named graphs is really a feature of the storage and not as uniformly treated as I would like. For an in-memory dataset, this

Re: Combining default graph with named graphs

Disregard -- this was a test data issue, not a SPARQL query issue. On Jun 11, 2013, at 9:39 AM, Cindy A McMullen wrote: > I have a graph that is referenced 'Event1' in my default graph, with object > properties "w:userFollowed" and "w:occurred".This query works: > > "SELECT DISTINCT ?graph

Re: Query the union of named graphs

On 11/06/13 16:06, Andy Seaborne wrote: On 10/06/13 21:52, Cindy A McMullen wrote: I'm using the in-memory Jena implementation (not TDB). How do I query across the union of named graphs? Union of named graphs is really a feature of the storage and not as uniformly treated as I would

Default and named graphs within TDB/Fuseki

Hi, I could use some help to understand default and named graphs within Jena (TDB/Fuseki)... In the following example taken from the W3C SPARQL 1.1 spec what needs to go in place of... FROM <http://example.org/dft.ttl> ...assuming I have loaded dft.ttl into the 'default' gra

Re: Loading named graphs from trig files?

On 17/09/13 16:09, Norman Walsh wrote: Hi, I attempted to load the trig example from the spec, but Jena says: WARN jena.riot: Only triples or default graph data expected : named graph data ignored What knob do I have to turn for Jena to provide access to the named graphs

How to write queries using named graphs?

I think jena employs named graphs as a way to achieve reification. As named graphs can achieve reification by attaching only one statement with named graphs. Is it possible to express information of the following form using named graphs, if yes then can someone please help me write this

Counting all triples performance and named graphs

Hi, we have a data set with 500 million triples. Single named graph, fuseki tdb2. We observe different performance between select (count(*) as ?cnt) { ?s ?p ?o } ~4 minutes select (count(*) as ?cnt) { graph  { ?s ?p ?o } } ~3 minutes select (count(*) as ?cnt) fr

Re: persistent inference on named graphs in Fuseki

the default graph being the union of them (it works, but without inference) - very simple inferencing (works but not with named graphs) - inferenced triples stored in TDB The first question is the following: is it realistic? Sorry, not really. Whether it's practical at all depends o

Re: persistent inference on named graphs in Fuseki

> Plus, as you already know, it's not named-graphs-aware. what does this mean?

Re: persistent inference on named graphs in Fuseki

On 02/04/17 09:18, Laura Morales wrote: Plus, as you already know, it's not named-graphs-aware. what does this mean? The rule-based inference engines only know about Graphs/Models, not Datasets. There's no built in support for inference over a dataset as a whole. There's

Re: persistent inference on named graphs in Fuseki

> There's no built in support for inference over a dataset as a > whole. There's no support for rules which test which graph a triple is > in or which assert results into difference graphs etc. - no inference over the whole graph, only inference on a single graph - no support to test which graph a

Re: persistent inference on named graphs in Fuseki

Hello, > Jena's inference is purely in memory so running over a TDB store is > possible but doesn't give you any scalability and is slower than > running over an in-memory copy of the same data. Plus, as you already > know, it's not named-graphs-aware. Thank you fo

Re: persistent inference on named graphs in Fuseki

On 02/04/17 10:04, Élie Roux wrote: Hello, Jena's inference is purely in memory so running over a TDB store is possible but doesn't give you any scalability and is slower than running over an in-memory copy of the same data. Plus, as you already know, it's not named-graphs-awa

Re: persistent inference on named graphs in Fuseki

asets and named graphs existed. Over the years Datasets, rather than single Graphs, have been the central concept for a lot of RDF processing and if you were designing an inference system now you would take that into account. Dave

Re: persistent inference on named graphs in Fuseki

>> - no inference over the whole graph, only inference on a single graph > > No inference support over the whole *Dataset*. "whole graph" I mean 2 or more graphs loaded into the server, that together make a larger graph. Isn't this the same thing as "dataset"? Or am I missing something?

Re: persistent inference on named graphs in Fuseki

ing as "dataset"? Or am I missing something? A Dataset is a collection of graph comprising one default graph and zero or more named graphs. The default graph in a dataset may be completely distinct from the named graphs or may contain some precomputed combination of them or (e.g

Re: persistent inference on named graphs in Fuseki

me thing as "dataset"? Or am I missing >> something? >> > > A Dataset is a collection of graph comprising one default graph and zero or > more named graphs. > > The default graph in a dataset may be completely distinct from the named > graphs or may

TDB Assembly: Multiple Named Graphs with RDFS Inferencing

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