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 > >>> > >>> > >
