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Generates a JSON-LD Context for Schema.org.
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from rdflib import * | |
SDO = Namespace("http://schema.org/") | |
datatype_coerce_map = { | |
#SDO.Number: XSD.double, | |
SDO.Date: 'xsd:date', | |
SDO.DateTime: "xsd:dateTime", | |
} | |
def make_context(graph, use_vocab=False, dt_coercion=False, object_coercion=False): | |
ctx = {'xsd': unicode(XSD)} | |
if use_vocab: | |
ctx['@vocab'] = SDO | |
else: | |
for cls in graph[:RDF.type:RDFS.Class]: | |
term_key = graph.value(cls, RDFS.label) | |
ctx[term_key] = unicode(cls) | |
for prop in graph[:RDF.type:RDF.Property]: | |
term_key = graph.value(prop, RDFS.label) | |
ranges = list(graph.objects(prop, SDO.rangeIncludes)) | |
coercion = None | |
if len(ranges) == 1: | |
if ranges[0] == SDO.URL: | |
coercion = "@id" | |
elif dt_coercion: | |
coercion = datatype_coerce_map.get(ranges[0]) | |
elif object_coercion and not any(SDO.DataType in | |
graph.objects(rng, RDFS.subClassOf*'*') for rng in ranges): | |
coercion = "@id" | |
if coercion: | |
dfn = ctx[term_key] = {"@type": coercion} | |
if not use_vocab: | |
dfn["@id"] = unicode(prop) | |
elif not use_vocab: | |
ctx[term_key] = unicode(prop) | |
return {"@context": ctx} | |
if __name__ == '__main__': | |
from sys import argv | |
import json | |
from rdflib.util import guess_format | |
args = argv[1:] | |
source = args.pop(0) | |
use_vocab = '-V' not in args | |
dt_coercion = '-d' in args | |
object_coercion = '-o' in args | |
graph = Graph().parse(source, format=guess_format(source)) | |
context = make_context(graph, use_vocab, dt_coercion, object_coercion) | |
s = json.dumps(context, sort_keys=True, indent=2, separators=(',', ': '), | |
ensure_ascii=False).encode('utf-8') | |
import re | |
print re.sub(r'{\s+(\S+: "[^"]+")\s+}', r'{\1}', s) |
The TopBraid RDF versions of the schema.org ontology can be transformed to JSON-LD (e.g. with rdfpipe
or a short pyld
script w/ framing and compaction, etc.), but do lag just a bit (due to lack of build automation integration)): http://topbraid.org/schema/
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This generates an JSON-LD
@context
from elasticearch mappings with rudimentaryxsd:
type mappings: https://github.com/westurner/elasticsearchjsonld/blob/master/elasticsearchjsonld/elasticsearchjsonld.py