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Questions tagged [stardog]

Questions related the Stardog RDF database.

Stardog is a fast, lightweight, RDF database: it supports ; HTTP and the SNARL protocol for remote access and control; as a data model; and for inference and data analytics. It also has advanced features such as full-text search via integration with and integrity constraints.

There is a mailing list and extensive documentation available online.

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Reasoning and datatypes of Literals

In Turtle-RDF it is convenient to omit the datatype extension ^^xsd:string for string literals. But when i try to do reasoning with StarDog, http://www.stardog.com/, only the individual :YYY with the extension "green"^^xsd:string is found to be a…
rmv
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Running Stardog-examples, build issues

I'm getting extremely frustrated. I've been trying to learn semantic web programming for the entire weekend and I've gotten no where. Nothing seems to build or work. I'm new to using maven and gradle but I've followed all the steps. Trying to build…
PoRco1x
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How can I get my Stardog service to autostart in azure ubuntu VM?

I'm a linux super newbie so let's break it down. I am following these instructions but it still doesn't seem to be working. My stardog.conf file looks like: description "stardog database" start on runlevel [2345] stop on runlevel [!2345] umask…
skylit
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Blank page in Stardog's database web interface

Whenever I create a new database from Stardog's web interface like this : I'm facing a blank page at http://localhost:5820/#/databases/cool. But http://localhost:5820/#/databases/cool/edit works perfectly. How to reproduce this bug Got Stardog 2.2…
Spadon_
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Stardog server start with license key : wrong STARDOG_HOME

I'm on MAC OSX. I added these lines in my ~/.bash_profile : PATH="/usr/local/stardog/bin:${PATH}" export STARDOG_HOME=/data/stardog export PATH Then, in command line, I execute cp stardog-licence-key.bin $STARDOG_HOME as the quick-start…
Spadon_
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Stardog 2.0 DataNotImpl cannot be cast to ClassExpression

I've created a (disk) database using stardog 2.0.0. I've loaded my ontology and some data to this database. I can see my ontology's axioms and this data when I execute the following command: ./stardog query -v --username user --passwd pass dbname…
gadeynebram
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example of stardog sparql insert query in java

Can somebody give one java example of sparql insert/Delete query in Stardog. there is only queryExecution.execSelect() method available. there is no queryExecution.execInsert() or queryExecution.execDelete() available. Please give one working…
Vishnudev K
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What happens if I close a connection from connection pool of stardog

Take a look at the following code. 1. I am creating a connection pool to stardog 2. Obtaining a connection from the pool. 3. Returning the connection to pool after the use. My question is what will happen if I do aConn.close() instead of returning…
Vishnudev K
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How to export database to OWL file in Stardog?

http://stardog.com/docs/using/#export shows help for exporting a db into "ttl" file. I wanted to export the database into some common formats like "rdf" or "owl". How to export to OWL format or RDF format?
Vishnudev K
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I have a problem in my React.js or Stardog server

I cloned the GitHub repository for the React.js tutorial, then I installed the dependencies. But I can't get the data from the database when I open the https:localhost:3000, and I have an error when I try to add data to the database. The error is…
Kheder
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Stardog on VM Linux Ubutu - memory capacity

We are experiencing performance problems with Stardog requests (about 500 000ms minimum to get an answer). We followed the Debian Based Systems installation described in the Stardog documentation and have a stardog service installed in our Ubutu…
SDA
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SPARQL how to get all triples with Individuals?

I'm just getting started with SPARQL. I am not sure where the error is. I came across the error as I was testing out the reasoner. i use Stardog as database and the reasoner is definitely on. i have a simple model with two classes: Building and Room…
mikst
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Push turtle file in bytes form to stardog database using pystardog

def add_graph(file, file_name): file.seek(0) file_content = file.read() if 'snomed' in file_name: conn.add(stardog.content.Raw(file_content,content_type='bytes', content_encoding='utf- 8'),…
Nilesh Gupta
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How to connect stardog studio with stardog server that has security disabled?

I am running stardog on the default port 5280 and i have successfully used stardog studio in the default configuration. To properly use stardog in my intranet i had to switch off security with ./stardog-server.sh start --disable-security and now i…
Wolfgang Fahl
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Stardog raises ConcurrentModificationException upon reasoned query on graph with SWRL Rules

When trying to execute a query with reasoning in a model, I get this error: 000012: com.complexible.stardog.plan.eval.operator.OperatorException: Uncaught error during query evaluation: ConcurrentModificationException Ontology model has 2 SWRL rules…
lore-f
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