No, there isn't currently support for N-Quads in EasyRDF.
Triples = [Subject, Property, Object]
Quads = [Subject, Property, Object, Graph]
The EasyRDF parsers currently have a fairly tight coupling with the
Graph object and don't support loading a document into multiple graphs.
Also, EasyRdf isn't very well suited to loading very large data sets -
it works much better with manipulating small documents.
I am not sure exactly what you are trying to achieve but one possibility
would be to pre-process the files and extract the sub-set of data that
you are interested in. Because of the simplicity of the n-quads format,
this could be done by processing one line at a time using PHP, perl, awk
Given the very large size of the datasets (nearly 500GB in total) you
may even want to look at something like Hadoop or Amazon EMR to
query/process/extract the dataset quickly.
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