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SPARQL language preview

1. SELECT with FILTER

keywords, variables, prefixed names, and built-in functions
horizon-dark
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT ?name ?email
WHERE {
  ?person a foaf:Person ;
          foaf:name ?name .
  OPTIONAL { ?person foaf:mbox ?email }
  FILTER (LANG(?name) = "en" || !BOUND(?email))
}
ORDER BY ?name
LIMIT 10
atom-one-dark
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT ?name ?email
WHERE {
  ?person a foaf:Person ;
          foaf:name ?name .
  OPTIONAL { ?person foaf:mbox ?email }
  FILTER (LANG(?name) = "en" || !BOUND(?email))
}
ORDER BY ?name
LIMIT 10
github-dark
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT ?name ?email
WHERE {
  ?person a foaf:Person ;
          foaf:name ?name .
  OPTIONAL { ?person foaf:mbox ?email }
  FILTER (LANG(?name) = "en" || !BOUND(?email))
}
ORDER BY ?name
LIMIT 10
dracula
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT ?name ?email
WHERE {
  ?person a foaf:Person ;
          foaf:name ?name .
  OPTIONAL { ?person foaf:mbox ?email }
  FILTER (LANG(?name) = "en" || !BOUND(?email))
}
ORDER BY ?name
LIMIT 10
nord
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT ?name ?email
WHERE {
  ?person a foaf:Person ;
          foaf:name ?name .
  OPTIONAL { ?person foaf:mbox ?email }
  FILTER (LANG(?name) = "en" || !BOUND(?email))
}
ORDER BY ?name
LIMIT 10
github
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT ?name ?email
WHERE {
  ?person a foaf:Person ;
          foaf:name ?name .
  OPTIONAL { ?person foaf:mbox ?email }
  FILTER (LANG(?name) = "en" || !BOUND(?email))
}
ORDER BY ?name
LIMIT 10

2. CONSTRUCT

building a new graph from a WHERE pattern
horizon-dark
PREFIX foaf: <http://xmlns.com/foaf/0.1/>

CONSTRUCT {
  ?person foaf:knows ?friend .
}
WHERE {
  ?person foaf:friendOf ?friend .
  FILTER NOT EXISTS { ?person foaf:knows ?friend }
}
atom-one-dark
PREFIX foaf: <http://xmlns.com/foaf/0.1/>

CONSTRUCT {
  ?person foaf:knows ?friend .
}
WHERE {
  ?person foaf:friendOf ?friend .
  FILTER NOT EXISTS { ?person foaf:knows ?friend }
}
github-dark
PREFIX foaf: <http://xmlns.com/foaf/0.1/>

CONSTRUCT {
  ?person foaf:knows ?friend .
}
WHERE {
  ?person foaf:friendOf ?friend .
  FILTER NOT EXISTS { ?person foaf:knows ?friend }
}
dracula
PREFIX foaf: <http://xmlns.com/foaf/0.1/>

CONSTRUCT {
  ?person foaf:knows ?friend .
}
WHERE {
  ?person foaf:friendOf ?friend .
  FILTER NOT EXISTS { ?person foaf:knows ?friend }
}
nord
PREFIX foaf: <http://xmlns.com/foaf/0.1/>

CONSTRUCT {
  ?person foaf:knows ?friend .
}
WHERE {
  ?person foaf:friendOf ?friend .
  FILTER NOT EXISTS { ?person foaf:knows ?friend }
}
github
PREFIX foaf: <http://xmlns.com/foaf/0.1/>

CONSTRUCT {
  ?person foaf:knows ?friend .
}
WHERE {
  ?person foaf:friendOf ?friend .
  FILTER NOT EXISTS { ?person foaf:knows ?friend }
}

3. Property paths and typed literals

a property path expression and a lang/datatype-tagged literal
horizon-dark
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

SELECT ?name ?age WHERE {
  ?person foaf:knows+/foaf:name ?name .
  ?person foaf:age "30"^^xsd:integer ;
          foaf:label "Alice"@en .
  FILTER (?age > 18)
}
atom-one-dark
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

SELECT ?name ?age WHERE {
  ?person foaf:knows+/foaf:name ?name .
  ?person foaf:age "30"^^xsd:integer ;
          foaf:label "Alice"@en .
  FILTER (?age > 18)
}
github-dark
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

SELECT ?name ?age WHERE {
  ?person foaf:knows+/foaf:name ?name .
  ?person foaf:age "30"^^xsd:integer ;
          foaf:label "Alice"@en .
  FILTER (?age > 18)
}
dracula
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

SELECT ?name ?age WHERE {
  ?person foaf:knows+/foaf:name ?name .
  ?person foaf:age "30"^^xsd:integer ;
          foaf:label "Alice"@en .
  FILTER (?age > 18)
}
nord
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

SELECT ?name ?age WHERE {
  ?person foaf:knows+/foaf:name ?name .
  ?person foaf:age "30"^^xsd:integer ;
          foaf:label "Alice"@en .
  FILTER (?age > 18)
}
github
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

SELECT ?name ?age WHERE {
  ?person foaf:knows+/foaf:name ?name .
  ?person foaf:age "30"^^xsd:integer ;
          foaf:label "Alice"@en .
  FILTER (?age > 18)
}