OK, more or less what I suspected. And IRIResolver.resolve(String relStr, String baseStr) can be used by the parser for said URI resolution? https://jena.apache.org/documentation/javadoc/arq/org/apache/jena/riot/system/IRIResolver.html#resolve-java.lang.String-java.lang.String-
So far I'm not implementing a proper ReaderRIOT yet, just doing some conversion to RDF. On Wed, Aug 14, 2019 at 12:13 PM Andy Seaborne <[email protected]> wrote: > > StreamRDF is an interface called by parsers (and other things) based on > what it sees. > > If in, say Turtle, teh pasrer sees a "BASE" then base(...) is called. > > StreamRDF (it is an interface) does not do anything - its a stream of > incoming RDF for the implementation to deal with. > > StreamRDFLib.writer writes N-quads. No way to say "BASE". > > Triples sent to triple() should be already resolved - a parser > responsibility. > > Andy > > On 14/08/2019 09:28, Claude Warren wrote: > > The StreamRDF just passed the base() argument on to the sink so that the > > sink would have the base in order to set create the FQ URI from local > > URIs. > > > > StreamRDFLib simply ignores the base() call. > > Did you mean StreamRDFBase? > > StreamRDFLib is a colelction of fucntiosn and isn't itself does not have > the StreamRDF interface. > > > I assume this is because it > > is intended to process fully qualified RDF. > > > > I think the assumption is that if you are streaming into the graph you > > would need the base() to resolve any inbound local URIs while if you are > > streaming out from the graph the URIs are already fully resolved. > > > > I didn't write this code so I am not certain but if that is the case > > perhaps we should note it in the javadocs. > > > > I do note that StreamRDF says it is for output, in which case I am not > > certain why the base() is needed at all. > > > > Claude > > > > > > > > On Tue, Aug 13, 2019 at 11:46 PM Martynas Jusevičius > > <[email protected]> > > wrote: > > > >> Hi, > >> > >> I'm trying to understand what the purpose/usage of StreamRDF.base() is. > >> > >> Isn't it supposed to set the base URI that relative URIs in the stream > >> resolve against? > >> > >> I've made a simple test: > >> > >> StreamRDF rdfStream = StreamRDFLib.writer(new BufferedWriter(new > >> OutputStreamWriter(System.out))); > >> rdfStream.start(); > >> rdfStream.base("http://localhost/";); > >> rdfStream.triple(new Triple(NodeFactory.createBlankNode(), > >> NodeFactory.createURI("relative"), NodeFactory.createBlankNode())); > >> rdfStream.finish(); > >> > >> The output I get: > >> > >> _:Bf410fc50X2De0baX2D464eX2D996eX2Dbb3207090baa <relative> > >> _:B4b65b796X2D3561X2D4bf3X2Dbf31X2D1154aac0c816 . > >> > >> Why is the property URI <relative> and not <http://localhost/relative>? > >> Doesn't that make the output invalid N-Triples? Or am I writing it wrong? > >> > >> Martynas > >> atomgraph.com > >> > > > >
