Python - rdflib - json-ld - why does it not parse the nested triples

Question

I have the following code, parsing the JSON-ld file below. However, it only outputs the top-level triples and not the other, such as the name of the WebPage

from rdflib import Dataset
from rdflib.namespace import Namespace, NamespaceManager

local_input="""
[
    {
        "@context": "https://schema.org/"
    },
    {
        "@type": "WebPage",
        "@id": "https://example.com/glossary/term/",
        "name": "My Glossary Term",
        "abstract": "Just my glossary Term.",
        "datePublished": "2024-03-08T07:52:13+02:00",
        "dateModified": "2024-03-08T14:54:13+02:00",
        "url": "https://example.com/glossary/term/",
        "author": {
            "@type": "Person",
            "@id": "https://example.com/",
            "name": "John Doe"
        },
        "about": [
            {
                "@type": "DefinedTerm",
                "@id": "https://example.com/glossary/term/#definedTerm"
            }
        ]
    },
    {
        "@type": "DefinedTerm",
        "@id": "https://example.com/glossary/term/#definedTerm",
        "name": "My Term",
        "description": "Just my Term",
        "inDefinedTermSet": {
            "@type": "DefinedTermSet",
            "@id": "https://example.com/glossary/#definedTermSet"
        }
    }
]
"""

SCH = Namespace('https://schema.org/')
namespace_manager = NamespaceManager(Dataset(), bind_namespaces='none')
namespace_manager.bind('', SCH, override=True)
g = Dataset()
g.namespace_manager = namespace_manager
g.parse(data=local_input, format='json-ld', publicID="http://schema.org/")

print(len(g))

import pprint
for stmt in g:
    pprint.pprint(stmt)

OUTPUT:

2
(rdflib.term.URIRef('https://example.com/glossary/term/'),
 rdflib.term.URIRef('http://www.w3.org/1999/02/22-rdf-syntax-ns#type'),
 rdflib.term.URIRef('http://schema.org/WebPage'),
 rdflib.term.URIRef('urn:x-rdflib:default'))
(rdflib.term.URIRef('https://example.com/glossary/term/#definedTerm'),
 rdflib.term.URIRef('http://www.w3.org/1999/02/22-rdf-syntax-ns#type'),
 rdflib.term.URIRef('http://schema.org/DefinedTerm'),
 rdflib.term.URIRef('urn:x-rdflib:default'))

Nicholas Car · Accepted Answer · 2024-05-03 15:59:12Z

0

You JSON-LD input data is not quite right, try this:

{
  "@context": {
    "@vocab": "https://schema.org/"
  },
  "@graph": [
    {
      "@id": "https://example.com/glossary/#definedTermSet",
      "@type": "DefinedTermSet"
    },
    {
      "@id": "https://example.com/",
      "@type": "Person",
      "name": "John Doe"
    },
    {
      "@id": "https://example.com/glossary/term/",
      "@type": "WebPage",
      "about": {
        "@id": "https://example.com/glossary/term/#definedTerm"
      },
      "abstract": "Just my glossary Term",
      "author": {
        "@id": "https://example.com/"
      },
      "dateModified": "2024-03-08T14:54:13+02:00",
      "datePublished": "2024-03-08T07:52:13+02:00",
      "name": "My Glossary Term",
      "url": "https://example.com/glossary/term/"
    },
    {
      "@id": "https://example.com/glossary/term/#definedTerm",
      "@type": "DefinedTerm",
      "inDefinedTermSet": {
        "@id": "https://example.com/glossary/#definedTermSet"
      },
      "name": "My Term"
    }
  ]
}

You can load this and it will print out all the triples you tried to create in the data.

answered May 3, 2024 at 15:59

Nicholas Car

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2 Comments

Kaj Kandler Over a year ago

In what sense is the JSON-LD not quite right? I understand if I have no nested elements, such as ``` "author": { "@type": "Person", "@id": "example.com", "name": "John Doe" }, ``` it does not need to read them. Yet it does not explain why RDFLib does not read it.

Nicholas Car Over a year ago

I think it is to do with the @context part. I think you need to indicate a @vocab key in there for the base namespace of all the other keys in the document and then you also need to indicate a @graph element in the data. There are several ways to formulate JSON-LD but your data doesn't load correctly in RDFLib or in the JavaScipt-based JSON-LD playground (json-ld.org/playground)

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