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Questions tagged [semantic-web]

Representation of database record subjects (a/k/a keys, IDs, entities), predicates (a/k/a columns, attributes), and objects (a/k/a values) as triples, where the first two are always URIs, and the third is either a URI or a literal; enabling humans and machines to more easily share, merge, and evaluate data from heterogeneous origins.

The Semantic Web (Web 3.0) provides a common framework that allows data to be shared and reused across application, enterprise, and community boundaries. It is a collaborative effort led by the W3C with participation from a large number of researchers and industrial partners. It is based on the Resource Description Framework (RDF).

1956 questions
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Sparql Keys vs distinct values

I have a sparql query that returns duplicates, and I want it to clean them up on one of the values only (subjectID). Unlike DISTINCT that seems to find a unique value for the combination of values selected, rather than for only one of the…
Nava
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RDF, Triples, and Semantic Web in everyday apps

Vague, uninformed questions: 1: Why do nearly 100% of app developers, app development communities and literature (books, tutorials, etc) take for-granted that you want to express data using either a relational database or a key-value store? 2: Why…
themirror
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RDF namespaces (Semantic data)

I am trying to come up with an ontology (internal) for my application. However, I want to borrow as much as I can. When I look around different existing ontology, I observe an overlap. For eg: foaf:Person and dbpedia:Person etc. Both are subclasses…
gaurav jain
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Is there a way to represent temporal data in RDFs?

I have bunch of temporal data which I want to convert to RDF format. Is there any accepted way of doing so? Example of tabulated data which should be somehow converted into RDF format: | Name | Date | Salary …
gintas
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Querying with Spaces Sparql

Say if I want to return the result "having fun" of the triple. I don't know how to account for the space in between the words. Below is a query I tried but it didn't work. Let me know if anyone can spot what I doing wrong
Sam
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Semantic Web :Tutorial on RDF dev

I am new to Semantic Web. I want to start working on creating some basic RDF document and publish them to get a feel how it works.I found a lot of information about the concepts,vocabulary etc but I couldn't find any thing related to development as…
Kapil
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RDFS vs SKOS, when to use what?

As I'm learning semantic-web & sparql, sensing that RDFS & SKOS seem to offer very similar semantic relations modeling capabilities. For example, RDFS - rdfs:subClassOf, rdfs:superClassOf can be used to model the hierarchy SKOS - skos:narrower,…
Sahas
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What's the relationship between OWL, RDFs, RDFa, Dublin Core and FOAF?

Semantic web can be described as Layer Structure. we have URI in the button layer which is the unique identifier for data. and then we hay syntax like : xml, ns and xml xmls next it is the way how can we interpret semantic data : RDF and above RDF,…
Camellia
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Is there any web semantic framework who doesn't represent triple like a tri-node structure?

In my work we are building a huge aplication that will use billions of triples, to optmize the space required to store these triples I've been searching for a different way to represent them, any way that is more economic is welcome. Thanks
Guilherme
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Loading Notation3 into a Database

How do you parse and load the triples represented by a Notation3 file into a database? I'm somewhat familiar with Jena and Sesame, but these seemed geared to process RDF or Turtle, not full Notation3. I've found relatively few robust tools for…
Cerin
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Join semantic endpoints in SPARQL query

I'm trying to make a request which uses both bibleontology and dbpedia semantic databases: PREFIX bibleontology: PREFIX dbo: SELECT ?art ?abstract WHERE { bibleontology:Ezra…
raphink
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Querying JSON-LD at scale

The question of large scale data architecture is of course a vast topic and I am far from an expert. However, I am interested in how JSON-LD is used at scale, so please excuse the lack of specificity and the high-level question. Clearly, big players…
Boris
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open source semantic web project

I am looking for an open source semantic web project, I know there are Jena and Sesame but I'm looking for another open source semantic web project.
user458056
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Could anyone help me with a tool for RDF/OWL visualization?

I tried searching over the internet but could not find the right tool for the purpose, so if anyone could provide me a link to the tool which could parse and display a graph for RDF and OWL ontologies.
Dupsmaskara19
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boundary for arbitrary property path in SPARQL 1.1

Is it possible to bound the length of property path? For example getting all the triples with lengths that are between (m,n) or all that are not between this range? For instance, how could this be done with the following query? select ?x ?y where…
jd466
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