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Questions tagged [linked-data]

Linked Data refers to a set of best practices for publishing data on the Web under the Semantic Web standards (RDF, SPARQL, etc.). Please consider asking your question on https://opendata.stackexchange.com, if your question is not closely related to programming or is related to a particular Linked Data dataset.

T. Berners-Lee outlines four principles of linked data in his "Linked Data" note:

  1. Use URIs as names for things
  2. Use HTTP URIs so that people can look up those names
  3. When someone looks up a URI, provide useful information, using the standards (RDF*, SPARQL)
  4. Include links to other URIs, so that they can discover more things
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Is Linked MDB up-to-date?

When I try to look for The Machine and many other films in LinkedMDB, I'm not able to find them. I can get the film's IMDB URL and query for the foaf:page property with the SPARQL endpoint, using a query like this, but it returns no results. prefix…
Alessandro Suglia
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Difference between rdfs:seeAlso and rdfs:isDefinedBy

What is the difference between rdfs:seeAlso and rdfs:isDefinedBy? When I can use rdfs:seeAlso and when I can use rdfs:isDefinedBy? Can you do any examples for me?
user3582433
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Enumerating "type" properties used in DBpedia?

Given a random set of DBpedia resources (objects), I'd like to get all their types, e.g. resources they are related to with ANY KIND of type-relationship. Therefore, I want to identify that kind of property, i.e., all kinds of type-properties. I've…
SuperUser01
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OWL DL work-arounds instead of imports?

I'm learning how to use the Good relation ontology in particular, together with the Product type ontology that it recommend as a basic ontology to further describe/type your goods: http://www.productontology.org/ Looking at how the product type…
MaatDeamon
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Spatial indexing in Strabon

I recently installed several triple stores to test the performance of them regarding geospatial queries (when possible). One of those triple stores is Strabon. In the other triple stores it was necessary to do an index or specific a spatial index to…
Alex van den Hoogen
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How to write a simple content negotiation with apache

I would like to write a rules that says, whenever that resource is requested, if the content type is X return the file_x, if it is Y return file_Y Can anyone help here ? Many thanks, -D-
MaatDeamon
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Visualize sparql query

I am doing some work over a subscribe/publish system. With a ontology we can provide with some attributes for users to fill in and then we turn it into a sparql query to match with the items in our database, but there is a function in our system…
Stepin2
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What query languages are available for querying linked data?

I'm familiar with SPARQL, but when talking about SPARQL & linked data with people, occasionally they make comments about SPARQL not being a good query language, or having issues with the spec. So, naturally, I'd like to know, what other query…
Kristian
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How do I make my raw scientific data useful to the semantic web?

I have a large set of raw structured datasets in CSV and HDF5 format. I would usually upload these to a web server as they are, but what steps are required to incorporate this data to the semantic web?
kobrien
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owl ontology (data properties)

In Protégé, I've created an ontology with classes Service, Attributes, etc., and an object property hasAttributes as follow: Service has Attributes Attributes (serviceIdentifier:String, Type(String), Description (sting), providerIdentifier…
Nanis
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Extracting a Gzip-file leads to a Gzip-file

I have a nquads file 'articles.nq.gz', (can be found at http://opencitations.net/source-data/ )After using the command gunzip articles.nq.gz I end up with 'acrticles.nq', but the document isn't recognized as an .nquads type, but is still…
user3169904
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Querying across heterogeneous triplestores

What I currently believe to be true: Triplestores are all about 'linked data'; data that is decoupled from any given application and can be augmented through afferent links formed by new data. This concept drives the Web. URIs allow linked data to…
Lawrence Wagerfield
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museum ontology development

Currently, I am involved in cultural heritage ontology development for our local museum data to serve as metadata and the upper level semantic model. Our primary goal is to move data into linked open data cloud to enrich information about the items…
jrpathfinder
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Visio linked data connectors

I found some tutorials on how to relate a Visio shape to a rows of excel data. I found the Excel Visio plug in very useful too - as it allows multiple shapes and connections to be automatically generated and laid out from excel data. BUT I cannot…
SteveGroom
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Linked Data with google custom search API

I just want to make a project that i got my data from google custom search and then make these data as a linked data so i searched for this and got that there's something called implement wrapper around your api and found something called…
Sunshine 94
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