def _render_skos_rdf(self):
namespace_manager = NamespaceManager(Graph())
namespace_manager.bind('dct', DCTERMS)
namespace_manager.bind('skos', SKOS)
concept_g = Graph()
concept_g.namespace_manager = namespace_manager
for s, p, o in g.triples((URIRef(self.concept.uri), None, None)):
concept_g.add((s, p, o))
# serialise in the appropriate RDF format
if self.format in ['application/rdf+json', 'application/json']:
return Response(concept_g.serialize(format='json-ld'),
mimetype=self.format)
else:
return Response(concept_g.serialize(format=self.format),
mimetype=self.format)
def get_narrowers(uri, depth):
"""
Recursively get all skos:narrower properties as a list.
:param uri: URI node
:param depth: The current depth
:param g: The graph
:return: list of tuples(tree_depth, uri, prefLabel)
:rtype: list
"""
depth += 1
# Some RVA sources won't load on first try, so ..
# if failed, try load again.
g = None
max_attempts = 10
for i in range(max_attempts):
try:
g = Graph().parse(uri + ".ttl", format="turtle")
break
except:
logging.warning(
"Failed to load resource at URI {}. Attempt: {}.".format(uri, i + 1)
)
if not g:
raise Exception(
"Failed to load Graph from {}. Maximum attempts exceeded {}.".format(
uri, max_attempts
)
)
items = []
for s, p, o in g.triples((None, SKOS.broader, URIRef(uri))):
items.append((depth, str(s), get_prefLabel_from_uri(s)))
items.sort(key=lambda x: x[2])
count = 0
for item in items:
count += 1
new_items = get_narrowers(item[1], item[0])
items = items[:count] + new_items + items[count:]
count += len(new_items)
return items