YAML

YAML is a lightweight, human-readable data-serialization language. YAML is a ``superset'' of JSON (any JSON file can be specified in YAML) and, similarly to JSON, data can be organised in lists or associative arrays. However, differently from JSON, comments and custom data types are allowed. Therefore, in addition to the basic data structures required for capturing JSON files, instance-of is needed for representing custom data types.

Extensions

SPARQL Anything selects this transformer for the following file extensions:

• yaml

Media types

SPARQL Anything selects this transformer for the following media types:

• application/yaml
• text/yaml
• x-text/yaml

Default implementation

• io.github.sparqlanything.yaml.YAMLTriplifier

Default Transformation

Data

key: value
another-key:
  - name: john
    surname: smith
# A comment
boolean: true
float: 0.1
two-values:
  - 1
  - "2"
nested-array:
  - nested-array:
      - nested:key: "Value with spaces"

Located at https://sparql-anything.cc/examples/example.yaml

Query

CONSTRUCT 
  { 
    ?s ?p ?o .
  }
WHERE
  { SERVICE <x-sparql-anything:location=https://sparql-anything.cc/examples/example.yaml>
      { ?s  ?p  ?o }
  }

Facade-X RDF

@prefix fx:  <http://sparql.xyz/facade-x/ns/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix xyz: <http://sparql.xyz/facade-x/data/> .

[ rdf:type          fx:root ;
  xyz:another-key   [ rdf:_1  [ xyz:name     "john" ;
                                xyz:surname  "smith"
                              ]
                    ] ;
  xyz:boolean       true ;
  xyz:float         "0.1"^^xsd:double ;
  xyz:key           "value" ;
  xyz:nested-array  [ rdf:_1  [ xyz:nested-array  [ rdf:_1  [ <http://sparql.xyz/facade-x/data/nested%3Akey>
                                                                      "Value with spaces" ]
                                                  ]
                              ]
                    ] ;
  xyz:two-values    [ rdf:_1  "1"^^xsd:int ;
                      rdf:_2  "2"
                    ]
] .

Options

Summary

Option name	Description	Valid Values	Default Value
yaml.allow-duplicate-keys	Tolerate duplicate keys (last wins).	true,false	false

---

yaml.allow-duplicate-keys

Description

Yaml 1.2 forbids duplicate keys, raising an error (default behaviour). When true, duplicate keys are tolerated (last wins).

Valid Values

true false

Default Value

false