Comments (8)
Actually, the 2nd parameter of TurtleSerializer
correctly adds the specified prefixes in the saved file, but it also adds the defaults prefixes from Data.RDF.Namespace.standard_ns_mappings
from rdf4h.
Actually, the 2nd parameter of TurtleSerializer correctly adds the specified prefixes in the saved file, but it also adds the defaults prefixes from Data.RDF.Namespace.standard_ns_mappings
@koslambrou could you put together a small, compilable, example that demonstrates this? Thanks.
from rdf4h.
Here:
import Data.RDF (RDF)
import qualified Data.RDF as RDF
import qualified Data.RDF.Namespace as RDF
import qualified Data.Map as Map
test :: IO ()
test = do
let emptyRdf = RDF.empty :: RDF RDF.TList
let mappings = RDF.PrefixMappings $ Map.fromList [ ("mo", "http://purl.org/ontology/mo/") ]
let baseUrl = "http://example.org/resource"
RDF.writeRdf (TurtleSerializer Nothing mappings) emptyRdf
Expected output:
@base <http://example.com/resource> .
@prefix mo: <http://purl.org/ontology/mo/> .
Actual output:
@prefix dc: <http://purl.org/dc/elements/1.1/> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix ex: <http://www.example.org/> .
@prefix ex2: <http://www2.example.org/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix mo: <http://purl.org/ontology/mo/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
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The actual output in my last comment is not on the latest commit.
Here's the actual output:
@prefix mo: <http://purl.org/ontology/mo/> .
There's just the @base missing.
from rdf4h.
Because in your code:
let baseUrl = "http://example.org/resource"
RDF.writeRdf (TurtleSerializer Nothing mappings) emptyRdf
You're not using baseUrl
in the TurtleSerializer
.
from rdf4h.
Oh right!
run :: RIO App ()
run = do
let emptyRdf = RDF.empty :: RDF RDF.TList
let mappings = RDF.PrefixMappings $ Map.fromList [ ("mo", "http://purl.org/ontology/mo/") ]
let baseUrl = Just "http://example.org/resource"
liftIO $ RDF.writeRdf (TurtleSerializer baseUrl mappings) emptyRdf
The actual output is still:
@prefix mo: <http://purl.org/ontology/mo/> .
from rdf4h.
Ah, thanks.
The optional argument representing the base URL in the Turtle parser is to use for resolving relative URLs in the document. This may be overridden in the document itself using the @base directive.
However in the Turtle serialisation, the optional base URL is used when serialising all URI nodes in the outputted RDF, i.e. normalising prefix:foo to be http://example.com/foo if the prefix
namespace is http://example.com
. That is, I'm not sure there's a need to include the @base in the serialised namespaces since no URIs in the outputted RDF are relative, they are all absolute.
from rdf4h.
The following Turtle output contains a relative URI, no?
@base <http://example.com/resource> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
</Movie> a rdfs:Class .
Isn't /Movie
considered a relative URI since it should be resolved to http://example.com/resource/Movie
with the base URI ?
Also, I don't understand the use case behind the optional base URL in the Turtle serialisation. Why would we want the convert a single prefix (e.g. prefix:foo
) to absolute form (e.g. http://example.com/foo
). Hope I make sense.
from rdf4h.
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