rdf2json
Reads RDF N-Triple/N-Quads that are sorted by subject and append a JSON/JSON-LD document per line in a designated output file.
Usage: rdf2json [options] --input filename.nt --output filename.json
Preliminaries
RDF N-Triples/N-Quads need to be sorted by subject, so that it is possible to output JSON/JSON-LD documents on-the-fly, without holding the entire input in memory or falling back to time consuming file-pointer seek operations.
Both RDF formats can be sorted on Mac OS X and Linux using the following shell command:
sort -k 1,1 UNSORTED.EXT > SORTED.EXT
Required options
-
-i
,--input FILE
: Input file for the conversion; either RDF N-Triples or N-Quads. -
-o
,--output FILE
: Output file to which JSON-LD/JSON is appended.
Options
-
-m
,--minimize
: Minimize JSON-LD to plain (semantically untyped) JSON. -
-n
,--namespace [NAMESPACE]
: Alternative name for JSON-LD's "@id" key; replaces it; turns on--minimize
-
-p
,--prefix [PREFIX]
: Prefix that should be removed from keys; requires--minimize
. -
-t
,--triples
: Input file is in RDF N-Triples format. -
-q
,--quads
: Input file is in RDF N-Quads format.
Common options
-
-s
,--silent
: Do not output summary statistics. -
-v
,--version
: Displays the version number of the software. -
-h
,--help
: Show this message.
JSON output (--minimize
option)
- replaces "@id" keys with an alternative name if the
--namespace
option is present - keys that start with the prefix of
--prefix
are shortened (prefix is removed) - array contents are "lifted up", i.e. for each entry of the array:
- hashes with a "@value" key are replaced by the value of "@value", or else
- hashes with a "@id" key are replaced by the value of "@id", or else
- the array value is left unchanged
- removes all "@type" key/value pairs
Installation
gem install rdf2json
Project home page
Information on the source tree, documentation, examples, issues and how to contribute, see
http://github.com/joejimbo/rdf2json
The BioRuby community is on IRC server: irc.freenode.org, channel: #bioruby.
Biogems.info
This Biogem is published at (http://biogems.info/index.html#bio-rdf2json)
Copyright
Copyright (c) 2014 Joachim Baran. See LICENSE.txt for further details.