The class to which you refer is not a Jena type at all and has no connection with the Jena Graph type. The fact that the Sesame RepositoryConnection type understands namespace prefixes in no way implies that any particular Jena type will do the same thing in the same way. I’m not sure there is any Jena type that could even be said to represent the same abstraction as a Sesame Repository or RepositoryConnection. They're two different and entirely independent software projects.
Can you give us something of the code you are trying to write? I have a feeling that there is some kind of earlier misunderstanding here that is leading to you trying to use both Jena and Sesame types together in this way. --- A. Soroka The University of Virginia Library > On Mar 3, 2016, at 8:16 PM, Valerio Belcastro <valerio.belcas...@gmail.com> > wrote: > > I want to achieve the same behavior of getNamespaces() > <http://rdf4j.org/sesame/2.7/apidocs/org/openrdf/repository/RepositoryConnection.html#getNamespaces()> > method > from Sesame RepositoryConnection > <http://rdf4j.org/sesame/2.7/apidocs/org/openrdf/repository/RepositoryConnection.html> > class. This method returns associations between prefixes and namespaces. > Here is an output example: > > :: http://example.org/book/ > ns :: http://example.org/ns# > vcard :: http://www.w3.org/2001/vcard-rdf/3.0# > dc :: http://purl.org/dc/elements/1.1/ > > I know that i can retrieve all namespaces from a Jena model using > listNameSpaces() method, but I also need prefixes (like example above) > > 2016-03-04 0:33 GMT+01:00 A. Soroka <aj...@virginia.edu>: > >> Yes, this was my point: a SPARQL (RDF) dataset is not a syntactic >> construct. It is a collection of graphs defined by its behavior. >> >> If you could write some more about your use case for this mechanism, we >> might be able to help you resolve it by some other means… >> >> --- >> A. Soroka >> The University of Virginia Library >> >>> On Mar 3, 2016, at 6:27 PM, Martynas Jusevičius <marty...@graphity.org> >> wrote: >>> >>> As far as I understand, prefix mapping is only available after >>> parsing, as it's a purely syntactic thing. Some syntaxes have prefixes >>> (Turtle or RDF/XML, for example), some don't (N-Triples). So in >>> general you cannot retrieve them, as there is no such thing in the RDF >>> data model. I might be wrong though :) >>> >>> On Fri, Mar 4, 2016 at 12:22 AM, Valerio Belcastro >>> <valerio.belcas...@gmail.com> wrote: >>>> Jena Graph class has the method getPrefixMapping() >>>> < >> https://jena.apache.org/documentation/javadoc/jena/org/apache/jena/graph/Graph.html#getPrefixMapping-- >>> . >>>> This method returns a map that associates prefixes to their uri. I would >>>> like to achieve the same behaviour with a remote graph without using >>>> DatasetAccessor. >>>> >>>> 2016-03-03 23:12 GMT+01:00 A. Soroka <aj...@virginia.edu>: >>>> >>>>> If you are talking about a graph accessed via SPARQL, it’s not clear >> (to >>>>> me) what you mean by “prefix mapping”. A SPARQL dataset doesn’t have a >>>>> prefix mapping that is constant between queries. Is there something >> else >>>>> you mean by the term? >>>>> >>>>> --- >>>>> A. Soroka >>>>> The University of Virginia Library >>>>> >>>>>> On Mar 3, 2016, at 4:00 PM, Valerio Belcastro < >>>>> valerio.belcas...@gmail.com> wrote: >>>>>> >>>>>> Hi guys, >>>>>> >>>>>> Is it possible to get prefix mapping from remote graph in Jena? >>>>>> >>>>>> I know that I can get a model (and then its prefix mapping) through >>>>>> DatasetAccessor class, but I think it is too much expensive when >> using a >>>>>> model containing large amounts of triples. Is there another way to >>>>> achieve >>>>>> this or am I missing something? >>>>>> >>>>>> thank you in advance >>>>> >>>>> >> >>
