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This serialiser will output an RDF Graph as a JSON-LD formatted document. See http://json-ld.org/
Example:
```python
>>> from rdflib import Graph
>>> testrdf = '''
... @prefix dc: .
...
... dc:title "Someone's Homepage"@en .
... '''
>>> g = Graph().parse(data=testrdf, format='n3')
>>> print(g.serialize(format='json-ld', indent=2))
[
{
"@id": "http://example.org/about",
"http://purl.org/dc/terms/title": [
{
"@language": "en",
"@value": "Someone's Homepage"
}
]
}
]
```
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