owmeta_core.rdf_query_util module¶

exception owmeta_core.rdf_query_util.MissingRDFTypeException[source]¶

Raised when we were looking for an RDF type couldn’t find one

owmeta_core.rdf_query_util.get_most_specific_rdf_type(graph, types, base=None)[source]¶

Find the RDF type that isn’t a sub-class of any other, constrained to be a sub-class of base if that is provided.

Parameters

See also

owmeta_core.rdf_query_util.load(graph, start, target_type, *args)[source]¶

Loads a set of objects based on the graph starting from start

Parameters

graphrdflib.graph.Graph: The graph to query from
startgraph_object.GraphObject: The graph object to start the query from
target_typerdflib.term.URIRef: URI of the target type. Any result will be a sub-class of this type

owmeta_core.rdf_query_util.load_base(graph, idents, target_type, context, resolver)[source]¶

Loads a set of objects from an RDF graph given their identifiers

Parameters

graphrdflib.graph.Graph: The graph to query from
identslist of rdflib.term.URIRef: A list of identifiers to convert into objects
target_typerdflib.term.URIRef: URI of the target type. Any result will be a sub-class of this type
contextobject: Limits the scope of the query to statements within or entailed by this context. Notionally, it’s a owmeta_core.context.Context instance
resolverrdf_type_resolver.RDFTypeResolver: Handles some of the mappings

owmeta_core.rdf_query_util.load_terms(graph, start, target_type)[source]¶

Loads a set of terms based on the object graph starting from start

Parameters

graphrdflib.graph.Graph: The graph to query from
startgraph_object.GraphObject: The graph object to start the query from
target_typerdflib.term.URIRef: URI of the target type. Any result will be a sub-class of this type

owmeta_core.rdf_query_util.oid(identifier_or_rdf_type, rdf_type, context, base_type=None)[source]¶

Create an object from its rdf type

Parameters

identifier_or_rdf_typerdflib.term.URIRef: If rdf_type is provided, then this value is used as the identifier for the newly created object. Otherwise, this value will be the rdf_type of the object used to determine the Python type and the object’s identifier will be randomly generated.
rdf_typerdflib.term.URIRef: If provided, this will be the rdf_type of the newly created object.
contextContext, optional: The context to resolve a class from
base_typetype: The base type

Returns