Question 255312 in Json Question posted in
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Json – validating typed literals in RDF

given this RDF:

@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
@prefix ex: <http://example.com/>.
@prefix xsd: <http://www.w3.org/2001/XMLSchema#>.

ex:bob ex:has '{"name": robert"}'^^rdf:JSON .
ex:bob ex:at "204453"^^xsd:dateTime .

an RDF engine (such as Apache Jena) can validate some of the typed literals (e.g. xsd:dateTime):

$ ~/Downloads/apache-jena-4.7.0/bin/riot --validate file.ttl 
11:48:47 WARN  riot            :: [line: 6, col: 14] Lexical form '204453' not valid for datatype XSD dateTime

will any RDF engines validate the rdf:JSON typed literal?

notice the json isn’t well-formed.

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2

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  1. Chosen as BEST ANSWER
    0

    I like John Walker's solution but we also discovered that if you attempt to serialize that RDF (with the malformed json literal) as jsonld using Apache Jena it will validate the json literals:

    $ apache-jena-4.7.0/bin/riot --formatted=jsonld file.ttl

org.apache.jena.shared.JenaException: Exception while writing JSON-LD 1.1
...
Caused by: JsonLdError[code=An invalid JSON literal was detected [code=INVALID_JSON_LITERAL]., message=An invalid JSON literal was detected [code=INVALID_JSON_LITERAL].]

  2. 0

    You can use JavaScript SPARQL Functions in ARQ to implement a simple custom function that will tell you if a literal is parsable as JSON.

    This Gist demonstrates how that can be done: https://gist.github.com/jaw111/3955e6fb9aa48c7d627cec685a9d5cca

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