MarkLogic 9 Product Documentationop.pattern
op.pattern( subjects as String, predicates as String, objects as String, [systemCols as String] ) as patterndef
Summary
This function builds the parameters for the op.fromTriples function. The result is passed to op.fromTriples to project rows from the graph of triples. The columns in a pattern become the columns of the row. The literals in a pattern are used to match triples. You should specify at least one literal in each pattern, usually the predicate. Where a column appears in more than one pattern, the matched triples are joined to form the row. You can specify optional triples with a prototype.joinLeftOuter with a separate op.fromTriples .
| Parameters | |
|---|---|
| subjects | One column or one or more literal values, such as the literal returned by a sem.iri call. |
| predicates | One column or one or more literal values, such as the literal returned by a sem.iri call. |
| objects | One column or one or more literal values, such as the literal returned by a sem.iri call. |
| systemCols | Specifies the result of an op.fragmentIdCol or op.graphCol function to add columns for the fragment id or graph iri. |
Example
const op = require('/MarkLogic/optic');
// prefixer is a factory for sem:iri() constructors in a namespace
const resource = op.prefixer('http://dbpedia.org/resource/');
const foaf = op.prefixer('http://xmlns.com/foaf/0.1/');
const onto = op.prefixer('http://dbpedia.org/ontology/');
const person = op.col('person');
const Plan =
op.fromTriples([
op.pattern(person, onto('birthPlace'), resource('Brooklyn')),
op.pattern(person, foaf("name"), op.col("name"))
])
.select();
Plan.result();