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Facebook RDF Sync
see if we can get more fields per ObjectDocument ( with the fields=... parameter )
having too many triples is rarely an issue for the size of subgraphs we are downloading.
query IDs in bulk
Note that the memory usage will increase dramatically as we will receive several TTL documents in one response.
Idea: We could try to use a streaming json lib to parse the result
https://github.com/vibornoff/node-yajl
For some reason the Graph API may return blank IDs for some properties
For example:
"hometown": {
"id": "", <----- LIKE THIS ONE
"name": null
},
curl -H "Accept: text/turtle" -X GET "https://graph.facebook.com/555010177?access_token=AAAAAAITEghMBAEYd3iIfZCejGIA23hJeOMeQvvxBvkbMV9T0IxVCedWa1YCauWh90i6gmkcWmjnKQYLMZBatZC1JoPM7ZCBBfogkXXs9hAZDZD"
In Turtle, this results in the following triples
</555010177#> user:hometown </#> ;
And then:
</#> :id "" ; :name "" .
Therefore, it is safe to assume that all triples that contain the following
URI on any poisition are invalid:
<http://graph.facebook.com/#>
The following SPARQL query takes care of this issue
delete from <urn:divetouch:graph:facebook:friends>
{ ?s ?p ?o }
where
{ graph <urn:divetouch:graph:facebook:friends>
{ ?s ?p ?o .
filter ( ?s = <http://graph.facebook.com/#> || ?o = <http://graph.facebook.com/#> )
}
}
or, when you don't know the graph:
delete from ?g
{ ?s ?p ?o }
where
{ graph ?g
{ ?s ?p ?o .
filter ( ?s = <http://graph.facebook.com/#> || ?o = <http://graph.facebook.com/#> )
}
}
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