Streaming parsers

[gromgull]

Currently all parsers write into a graph. For cases where you want to stream-process RDF, it would be nice if triples could be handled as they come in.

Two fold:

1 Most of our parsers have a Triple Sink object:

• https://github.com/RDFLib/rdflib/blob/master/rdflib/plugins/parsers/nt.py#L7
• https://github.com/RDFLib/rdflib/blob/master/rdflib/plugins/parsers/ntriples.py#L41
• https://github.com/RDFLib/rdflib/blob/master/rdflib/plugins/parsers/notation3.py#L1572

Define this interface centrally and unify

2 Make sure we read the input stream as a stream, and do not read the whole thing into a string :)

[uholzer]

The same would be useful for serializers. This would one allow to easily impelement convertors between different serializations. Of course, this would not easily work for serializers that want to have the triples in a certain order.

[rlk-ama]

Hi, have you done anything in that direction yet ?