What is a SPARQL endpoint?
A SPARQL endpoint is a conformant SPARQL protocol service as defined in the SPROT specification. A SPARQL endpoint enables users (human or other) to query a knowledge base via the SPARQL… HTML (1350 views) (1189 Downloads)
What is FOAF in SPARQL?
Dataset: Friend of a Friend (FOAF) FOAF is a standard RDF vocabulary for describing people and relationships.
What is IRI in SPARQL?
The abbreviated forms (relative IRIs and prefixed names) in the SPARQL syntax are resolved to produce absolute IRIs. The following terms are defined in RDF Concepts and Abstract Syntax [CONCEPTS] and used in SPARQL: IRI (corresponds to the Concepts and Abstract Syntax term ” RDF URI reference “) literal.
Does Neo4j support SPARQL?
Since the Neo4j graph database is not a triple store, it is not equipped with a SPARQL query engine. However, Neo4j offers Cypher and for many semantic applications it should be possible to translate SPARQL to Cypher queries.
Where is SPARQL used?
SPARQL can be used to express queries across diverse data sources, whether the data is stored natively as RDF or viewed as RDF via middleware. SPARQL contains capabilities for querying required and optional graph patterns along with their conjunctions and disjunctions.
How do I filter a SPARQL query?
FILTER(condition) is a clause you can insert into your SPARQL query to, well, filter the results. Inside the parentheses, you can put any expression of boolean type, and only those results where the expression returns true are used.
What is a SPARQL server?
What is a SPARQL Query Service? A SPARQL Query Service is an HTTP Service (also known as a Web Service) that offers an API for performing declarative Data Definition and Data Manipulation operations on data represented as RDF sentence collections.
What is a virtuoso SPARQL endpoint, and why is it important?
A Virtuoso SPARQL endpoint is a major feature of every Virtuoso instance that delivers on the promise of increased expressivity and data access dexterity required by Knowledge Graphs that manifest as an AI-friendly Semantic Web of Linked Data. Fundamentally, it is an indispensable tool for modern data access, management, and integration.
When to use service clause in SPARQL query?
A SERVICE clause in the body of a SPARQL Query is used to identify a remote SPARQL Endpoint and the actual query that’s executed against that remote endpoint as part of a query solution production pipeline. What are SPARQL Query Result Serialization Formats?
What does it mean to support SPARQL federated queries?
Supports Federated SPARQL (a/k/a SPARQL-FED) — inclusion of a SERVICE clause that identifies an external SPARQL Protocol endpoint upon which to execute a sub-query — as one option for executing federated queries over SPARQL endpoints from the LOD Cloud
How is a query delivered to an endpoint?
A query is delivered to an endpoint via a HTTP request. The server associated with the endpoint returns a query solution via an HTTP response that includes a document URL.?s1 a?s9 .
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