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XQuery sem:bnode

MarkLogic 10 Product Documentation
sem.bnode

sem.bnode(
   [value as xs.anyAtomicType]
) as sem.blank

Summary

This function returns an identifier for a blank node, allowing the construction of a triple that refers to a blank node. This XQuery function backs up the SPARQL BNODE() function.

This function is a built-in.

Parameters
value If provided, the same blank node identifier is returned for the same argument value passed to the function.

Example

var sem = require("/MarkLogic/semantics.xqy");

var person1 = sem.bnode();
var person2 = sem.bnode();
var t1 = sem.triple(person1,
         sem.iri("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"),
	       sem.iri("http://xmlns.com/foaf/0.1/Person"));
var t2 = sem.triple(person2,
	       sem.iri("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"),
	       sem.iri("http://xmlns.com/foaf/0.1/Person"));
var t3 = sem.triple(person1,
	       sem.iri("http://xmlns.com/foaf/0.1/knows"), person2)
var results = new Array();
results.push(t1, t2, t3);
results;

 => // returns identifiers for blank nodes 
[{"triple":
  {"subject":
    {"value":"http://marklogic.com/semantics/blank/2404403597012311801"}, 
   "predicate":
    {"value":"http://www.w3.org/1999/02/22-rdf-syntax-ns#type"}, 
   "object":
    {"value":"http://xmlns.com/foaf/0.1/Person"}
   }
  }, 
 {"triple":
  {"subject":
    {"value":"http://marklogic.com/semantics/blank/499971585800807003"}, 
   "predicate":
    {"value":"http://www.w3.org/1999/02/22-rdf-syntax-ns#type"}, 
   "object":
    {"value":"http://xmlns.com/foaf/0.1/Person"}}}, 
 {"triple":{
   "subject":
    {"value":"http://marklogic.com/semantics/blank/2404403597012311801"}, 
   "predicate":
    {"value":"http://xmlns.com/foaf/0.1/knows"}, 
   "object":
    {"value":"http://marklogic.com/semantics/blank/499971585800807003"}
	  }
 }]

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