Triples not loaded when using @context and @graph #40

algrebe · 2016-04-19T08:25:09Z

I tried converting the following rdfa to jsonld on rdf translator.

<body>   
<div typeof="rdfs:Class" resource="http://schema.org/CreativeWork">
      <span class="h" property="rdfs:label">CreativeWork</span>
      <span property="rdfs:comment">The most generic kind of creative work, including books, movies, photographs, software programs, etc.</span>
       <span>Subclass of: <a property="rdfs:subClassOf" href="http://schema.org/Thing">Thing</a></span>
       <span>Source:  <a property="dc:source" href="http://www.w3.org/wiki/WebSchemas/SchemaDotOrgSources#source_rNews">rNews</a></span>
    </div>

    <div typeof="rdfs:Class" resource="http://schema.org/WebPage">
      <span class="h" property="rdfs:label">WebPage</span>
      <span property="rdfs:comment">A web page. Every web page is implicitly assumed to be declared to be of type WebPage, so the various properties about that webpage, such as &lt;code&gt;breadcrumb&lt;/code&gt; may be used. We recommend explicit declaration if these properties are specified, but if they are found outside of an itemscope, they will be assumed to be about the page.</span>
       <span>Subclass of: <a property="rdfs:subClassOf" href="http://schema.org/CreativeWork">CreativeWork</a></span>
    </div>
</body>

The result was the following -

{
  "@context": {
    "dc": "http://purl.org/dc/terms/",
    "dcterms": "http://purl.org/dc/terms/",
    "rdf": "http://www.w3.org/1999/02/22-rdf-syntax-ns#",
    "rdfs": "http://www.w3.org/2000/01/rdf-schema#",
    "schema": "http://schema.org/",
    "xsd": "http://www.w3.org/2001/XMLSchema#"
  },
  "@graph": [
    {
      "@id": "schema:CreativeWork",
      "@type": "rdfs:Class",
      "dcterms:source": {
        "@id": "http://www.w3.org/wiki/WebSchemas/SchemaDotOrgSources#source_rNews"
      },
      "rdfs:comment": "The most generic kind of creative work, including books, movies, photographs, software programs, etc.",
      "rdfs:label": "CreativeWork",
      "rdfs:subClassOf": {
        "@id": "schema:Thing"
      }
    },
    {
      "@id": "schema:WebPage",
      "@type": "rdfs:Class",
      "rdfs:comment": "A web page. Every web page is implicitly assumed to be declared to be of type WebPage, so the various properties about that webpage, such as <code>breadcrumb</code> may be used. We recommend explicit declaration if these properties are specified, but if they are found outside of an itemscope, they will be assumed to be about the page.",
      "rdfs:label": "WebPage",
      "rdfs:subClassOf": {
        "@id": "schema:CreativeWork"
      }
    }
  ]
}

However, when I try to load this json-ld using the following

import rdflib
g = rdflib.Graph()
# converted.jsonld is the file I saved the above output to.
g.load("converted.jsonld", format="json-ld")
list(g.triples((None, None, None)))
# the output is []

The text was updated successfully, but these errors were encountered:

algrebe · 2016-04-19T08:28:36Z

I tried parsing the rdfa using rdflib, and then serializing with json-ld.

import rdflib
g = rdflib.Graph()
g.load("input.rdfa", format="rdfa")
with open("output.jsonld", "w") as fp:
    fp.write(g.serialize(format="json-ld", indent=4))

cat output.jsonld

[
    {
        "@id": "http://schema.org/CreativeWork",
        "@type": [
            "http://www.w3.org/2000/01/rdf-schema#Class"
        ],
        "http://purl.org/dc/terms/source": [
            {
                "@id": "http://www.w3.org/wiki/WebSchemas/SchemaDotOrgSources#source_rNews"
            }
        ],
        "http://www.w3.org/2000/01/rdf-schema#comment": [
            {
                "@value": "The most generic kind of creative work, including books, movies, photographs, software programs, etc."
            }
        ],
        "http://www.w3.org/2000/01/rdf-schema#label": [
            {
                "@value": "CreativeWork"
            }
        ],
        "http://www.w3.org/2000/01/rdf-schema#subClassOf": [
            {
                "@id": "http://schema.org/Thing"
            }
        ]
    },
    {
        "@id": "http://schema.org/WebPage",
        "@type": [
            "http://www.w3.org/2000/01/rdf-schema#Class"
        ],
        "http://www.w3.org/2000/01/rdf-schema#comment": [
            {
                "@value": "A web page. Every web page is implicitly assumed to be declared to be of type WebPage, so the various properties about that webpage, such as <code>breadcrumb</code> may be used. We recommend explicit declaration if these properties are specified, but if they are found outside of an itemscope, they will be assumed to be about the page."
            }
        ],
        "http://www.w3.org/2000/01/rdf-schema#label": [
            {
                "@value": "WebPage"
            }
        ],
        "http://www.w3.org/2000/01/rdf-schema#subClassOf": [
            {
                "@id": "http://schema.org/CreativeWork"
            }
        ]
    }
]

Parsing the above output.jsonld works perfectly fine. The difference between this and the original jsonld I've posted is the @context and @graph .

algrebe · 2016-04-19T08:36:57Z

When defining the context somewhere else, and specifying it in each of the objects in the list using @context, it still works -

[   
    { 
      "@context": "schema.context",
      "@id": "schema:CreativeWork",
      "@type": "rdfs:Class",
      "dcterms:source": {
        "@id": "http://www.w3.org/wiki/WebSchemas/SchemaDotOrgSources#source_rNews"
      },
      "rdfs:comment": "The most generic kind of creative work, including books, movies, photographs, software programs, etc.",
      "rdfs:label": "CreativeWork",
      "rdfs:subClassOf": {
        "@id": "schema:Thing"
      }
    },
    { 
      "@context": "schema.context",
      "@id": "schema:WebPage",
      "@type": "rdfs:Class",
      "rdfs:comment": "A web page. Every web page is implicitly assumed to be declared to be of type WebPage, so the various properties about that webpage, such as <code>breadcrumb</code> may be used. We recommend explicit declaration if these properties are specified, but if they are found outside of an itemscope, they will be assumed to be about the page.",
      "rdfs:label": "WebPage",
      "rdfs:subClassOf": {
        "@id": "schema:CreativeWork"
      }
    }
]

How can I avoid writing @context in each of the objects ?

ant1b · 2016-04-20T15:40:47Z

Currently experiencing similar trouble in parsing some json-ld making use of "@graph" to attach a common "@context" to a list of identically structured objects.

ddxgz · 2016-09-12T13:29:35Z

Similar problem here also. Cannot parse back the serialized json-ld (serialized by rdflib-jsonld).

fserena · 2016-12-12T13:03:26Z

It seems to work when using ConjunctiveGraph instead of Graph.

jangwhan · 2017-01-22T16:41:50Z

@fserena
ConjunctiveGraph works!
I created g=ConjunctiveGraph and it now works perfectly fine

kud1ing · 2017-02-20T09:28:32Z

Example 61 from https://www.w3.org/TR/json-ld/ gives an empty graph for me, even with ConjunctiveGraph.

danbri · 2018-03-27T12:28:52Z

#53 seems to be the same issue. The suggested fix from @niklasl there also uses ConjunctiveGraph but is not working for me. See also RDFLib/rdflib#436

danbri · 2018-03-27T12:54:00Z

Maybe this helps: I got it working, only when I stopped using the method-result chaining shortcut syntax:

foo = ConjunctiveGraph()
bar = foo.parse(data=mydoor, format='json-ld')
foo.serialize()

This works. However the object "bar" returned from calling 'parse' is the wrong/empty graph, so we can't chain the expressions together with ConjunctiveGraph().parse(etc...).

- This will likely be a case that impacts anticipated usage.

Chiang97912 · 2020-03-23T18:33:34Z

Maybe this helps: I got it working, only when I stopped using the method-result chaining shortcut syntax:

foo = ConjunctiveGraph()
bar = foo.parse(data=mydoor, format='json-ld')
foo.serialize()

This works. However the object "bar" returned from calling 'parse' is the wrong/empty graph, so we can't chain the expressions together with ConjunctiveGraph().parse(etc...).

Thanks, It's work fine for me! Don't use the chain expressions together with ConjunctiveGraph().parse(etc...).

danbri mentioned this issue Mar 27, 2018

not loading jsonld file #53

Open

metatoaster added a commit to PMR2/pmr2.virtuoso that referenced this issue May 2, 2019

Workaround RDFLib/rdflib-jsonld#40

8edf772

- This will likely be a case that impacts anticipated usage.

seitenbau-govdata mentioned this issue Jul 9, 2019

Support JSON-LD catalogs with @graph ckan/ckanext-dcat#159

Merged

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Triples not loaded when using @context and @graph #40

Triples not loaded when using @context and @graph #40

algrebe commented Apr 19, 2016

algrebe commented Apr 19, 2016

algrebe commented Apr 19, 2016

ant1b commented Apr 20, 2016

ddxgz commented Sep 12, 2016

fserena commented Dec 12, 2016

jangwhan commented Jan 22, 2017 •

edited

Loading

kud1ing commented Feb 20, 2017

danbri commented Mar 27, 2018

danbri commented Mar 27, 2018

Chiang97912 commented Mar 23, 2020 •

edited

Loading

Triples not loaded when using @context and @graph #40

Triples not loaded when using @context and @graph #40

Comments

algrebe commented Apr 19, 2016

algrebe commented Apr 19, 2016

algrebe commented Apr 19, 2016

ant1b commented Apr 20, 2016

ddxgz commented Sep 12, 2016

fserena commented Dec 12, 2016

jangwhan commented Jan 22, 2017 • edited Loading

kud1ing commented Feb 20, 2017

danbri commented Mar 27, 2018

danbri commented Mar 27, 2018

Chiang97912 commented Mar 23, 2020 • edited Loading

jangwhan commented Jan 22, 2017 •

edited

Loading

Chiang97912 commented Mar 23, 2020 •

edited

Loading