Hi I have two csv data sources. The csv contains name of employees. csv1 with heading: Name Contents: Jack, Tom, Andy, Jim, Stella. csv2 with headi ...

I am creating a knowledge graph in SPARQL. I am importing data from a csv file. Now I want to filter a data corresponding to a country. In the csv I d ...

I have a org.apache.jena.riot.RiotException: Bad character in IRI (space) exception when reading an OWL/RDL model in Jena. I know that it's because I ...

What it says on the tin, I have a provided .ttl file which is in an n3 format, i.e.: Unfortunately I can't provide the full file. However, I can co ...

I have a knowledge base which includes multiple graphs. I want a way to formally define these graphs in my metadata layer. But I can't seem to find a ...

Suppose you know :hasFriend should be symmetric, but you don't have a schema and it is not always coded as such in the dataset. I can use a construct ...

I've set up some namespaces in virtuoso, but when I used jena to do sparql queries in virtuoso, some namespaces were not abbreviated: @prefix sio: ...

I design my own ontology and I reuse items from other ontologies. Is it good or bad practice to subclass an item from another ontology under an existi ...

So I am new to the world of the semantic web, RDF's and Ontologies How does the process of creating knowledge graphs work? Say I want to create knowle ...

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 d ...

Do you know of an RDF ontology for either football or tennis matches? I want to describe play-by-play events in the game and some statistics datasets. ...

I'm just starting to learn about the semantic web. can I perform CRUD operations using EasyRDF or other libraries? previously I saw other libraries l ...

Here is my simple working Sparql query: The thing is I'd like to add a variable in the select clause which is the duration between ?end and ?start, ...

I would like to write the following RDF data into MarkLogic: Expected result The data in the database is as following: Actual result There is ...

This is my RDF graph represented in RDF/XML fromat: These are the triples I get when I parse it with w3.org/RDF/Validator: My question is why ar ...

I want to create an edge list from a sparql query in which two nodes are connected by an edge if they are in the same document. The two nodes are both ...

I am trying to delete a known URI from our triplestore. It can be a subject or an object, by its predicates. So what I like to do is the following: ...

Say I have an update form such as: INSERT DATA { # ... data } WHERE { FILTER EXISTS { # ... condition } } which may or may not insert data dep ...

I need to embed RDFa data into HTML using Schema.org and DBpedia. Here is the HTML code (without DBpedia): I would like to declare also that the i ...

I know that the following remote HTTP IRI can be parsed directly with 'curl http://xxx' because they return RDF data directly: https://www.w3.org/ ...