MarkLogic 12 EA 1 Product Documentationsem:rdf-builder
sem:rdf-builder( [$prefixes as map:map?], [$graph as sem:iri?] ) as function(item(),item(),item()) as sem:triple
Summary
This function returns a function that builds triples
from CURIE and blank node syntax. The resulting function takes
three string arguments, representing subject, predicate,
and object respectively, which returns a sem:triple object
using the graph and prefix mappings passed in to the call to
sem:rdf-builder.
Blank nodes specified with a leading underscore (_) will
be assigned blank node identifiers, and will maintain that
identity across multiple invocations; for example,
"_:person1" will refer to the same node as a later
invocation that also mentions "_:person1". In the
predicate position, the special value of "a" will be
interpreted as the same as "rdf:type".
| Parameters | |
|---|---|
| prefixes | An optional set of prefix mappings. |
| graph | The graph value in which to place triples. Defaults to "http://marklogic.com/semantics#default-graph". |
Usage Notes
If you pass in a string tosem:rdf-builder, it will be
interpreted as a CURIE. If you want it to be interpreted as an IRI,
then cast the string to an IRI using sem:iri.
Example
xquery version "1.0-ml";
import module namespace sem = "http://marklogic.com/semantics"
at "/MarkLogic/semantics.xqy";
let $fac := sem:rdf-builder()
let $triple := $fac("foaf:person1", "foaf:knows", "foaf:person2")
return <result>{$triple}</result>
=>
<result>
<sem:triple xmlns:sem="http://marklogic.com/semantics">
<sem:subject>http://xmlns.com/foaf/0.1/person1</sem:subject>
<sem:predicate>http://xmlns.com/foaf/0.1/knows</sem:predicate>
<sem:object>http://xmlns.com/foaf/0.1/person2</sem:object>
</sem:triple>
</result>
Example
xquery version "1.0-ml";
import module namespace sem = "http://marklogic.com/semantics"
at "/MarkLogic/semantics.xqy";
let $fac := sem:rdf-builder()
let $t1 := $fac("_:person1", "a", "foaf:Person")
let $t2 := $fac("_:person2", "a", "foaf:Person")
let $t3 := $fac("_:person1", "foaf:knows", "_:person2")
return ($t1,$t2,$t3)
=>
sem:triple(
sem:blank("http://marklogic.com/semantics/blank/3655782280846814211"),
sem:iri("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"),
sem:iri("http://xmlns.com/foaf/0.1/Person"))
sem:triple(
sem:blank("http://marklogic.com/semantics/blank/1129346327653055324"),
sem:iri("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"),
sem:iri("http://xmlns.com/foaf/0.1/Person"))
sem:triple(
sem:blank("http://marklogic.com/semantics/blank/3655782280846814211"),
sem:iri("http://xmlns.com/foaf/0.1/knows"),
sem:blank("http://marklogic.com/semantics/blank/1129346327653055324"))