OK thanks Donny. Le vendredi 20 mai 2022 à 18:18:25 UTC+2, do...@polyneme.xyz a écrit :
> Hi Oliver, > > I have an idea for why this may not be working for you, but I'd rather > respond to a question on StackOverflow ( > https://stackoverflow.com/questions/ask) tagged with the "rdflib" tag > added (rdflib should autocomplete in the tags input), as this email list is > for technical matters relating to the RDFLib software, not usage questions. > > I just checked that I am subscribed to email notifications for new > [rdflib] questions (https://stackoverflow.com/questions/tagged/rdflib) on > StackOverflow. If I don't respond to your question soon, feel free to email > me directly to get on it. :) > > Best, > Donny > On Friday, May 20, 2022 at 8:13:53 AM UTC-7 Olivier Inizan wrote: > >> Hi there, >> >> I am trying to play with rdflib and a (my) user defined vocabulary (name: >> ODE). >> To do that I have generated a class namespace/_ODE.py derived from >> DefinedNamespace: >> 1 from rdflib.term import URIRef >> 2 from rdflib.namespace import DefinedNamespace, Namespace >> 3 >> 4 >> 5 class ODE(DefinedNamespace): >> 6 """ >> 7 DESCRIPTION_EDIT_ME_! >> 8 >> 9 Generated from: SOURCE_RDF_FILE_EDIT_ME_! >> 10 Date: 2022-05-02 08:38:55.619901 >> 11 """ >> 12 >> 13 _fail = True >> 14 >> 15 Function: URIRef >> 16 Equation: URIRef >> 17 hasDerivative: URIRef >> 18 Polynomial: URIRef >> 19 Ode: URIRef >> 20 >> 21 _NS = Namespace("ode#") >> 22 >> >> As all the new "classes" of the ODE vocabulary are a specialization of >> the class "Seq" I have created the module rdflib/ode.py: >> >> 1 from rdflib import Seq >> 2 from rdflib.namespace import RDF,ODE,MATH >> 3 >> 4 __all__ = ["Function", "Equation","Polynomial","Ode"] >> 5 >> 6 >> 7 class Ode(Seq): >> 8 def __init__(self, graph, uri, seq=[], rtype="Ode"): >> 9 """Creates a Container >> 10 >> 11 :param graph: a Graph instance >> 12 :param uri: URI or Blank Node of the Container >> 13 :param seq: the elements of the Container >> 14 :param rtype: the type of Container, one of "Bag", "Seq" or >> "Alt" >> 15 """ >> 16 >> 17 self.graph = graph >> 18 self.uri = uri or BNode() >> 19 self._len = 0 >> 20 self._rtype = rtype # rdf:Bag or rdf:Seq or rdf:Alt >> 21 >> 22 self.append_multiple(seq) >> 23 >> 24 # adding triple corresponding to container type >> 25 self.graph.add((self.uri, RDF.type, ODE[self._rtype])) >> 26 >> 27 class Function(Ode): >> 28 def __init__(self, graph, uri, seq=[]): >> 29 Ode.__init__(self, graph, uri, seq, "Function") >> 30 >> 31 >> 32 class Equation(Ode): >> 33 def __init__(self, graph, uri, seq=[]): >> 34 Ode.__init__(self, graph, uri, seq, "Equation") >> 35 >> 36 class Polynomial(Ode): >> 37 def __init__(self, graph, uri, seq=[]): >> 38 Ode.__init__(self, graph, uri, seq, "Polynomial") >> >> With these two classes I can generate a RDF file in a declarative way. >> For example we can create the Function c(t): >> 1 from rdflib import Graph, URIRef, RDF, BNode, RDFS, Literal, Seq, Bag, >> Function, Equation, Times, Minus, Polynomial, Ode >> 2 from rdflib.namespace import ODE, MATH >> 3 >> 4 # the time t >> 5 t = BNode("t") >> 6 graph.add((t,RDFS.label,Literal("t"))) >> 7 >> 8 c_of_t_label = BNode("c") >> 9 graph.add((c_of_t_label,RDFS.label,Literal("c"))) >> 10 c_of_t_bn = BNode("c_of_t") >> 11 >> 12 Function(graph,c_of_t_bn,[c_of_t_label,t]) >> >> And we obtain the following RDF: >> _:c rdfs:label "c" . >> _:t rdfs:label "t" . >> _:c_of_t a ode:Function ; >> rdf:_1 _:c ; >> rdf:_2 _:t . >> >> So far, so good. Now I want to execute a SPARQL query on this rdf to >> retrieve the function. >> >> >> >> 1 import rdflib >> 2 >> 3 from rdflib import Graph, URIRef, RDF, BNode, RDFS, Literal, Seq, Bag, >> Function, Equation, Times, Minus, Polynomial, Ode >> 4 from rdflib.namespace import ODE, MATH >> 5 >> 6 def main(): >> 7 g = rdflib.Graph() >> 8 g.parse("ode_spe", format="ttl") >> 9 >> 10 >> 11 function = ODE.Function >> 12 >> 13 query_test= "SELECT ?e WHERE {?e rdf:type ode:Function . }" >> 14 qres = g.query(query_test) >> 15 >> 16 print (len(qres)) >> 17 if __name__ == "__main__": >> 18 main() >> >> But I have no results. >> I probably do not do the right thing with ode:Function. >> >> I have two questions: >> - Is it the right way to add a user defined vocabulary ? >> - And what can I do to retrieve the function with a SPARQL query >> >> Thank for your help. >> >> Olivier >> > -- http://github.com/RDFLib --- You received this message because you are subscribed to the Google Groups "rdflib-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to rdflib-dev+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/rdflib-dev/37f9c269-40d5-4901-8a41-0de311d6b3f1n%40googlegroups.com.
