This adapter is not yet optimized for RDF.rb 0.2.x's enhanced query APIs; this may adversely affect triple pattern query performance.

This should be addressed in an upcoming version.

With the RDF::Repository, I can set a context with the #set_context method. After than, every statement I'm going to insert into the repository will be assigned this context.

But when I delete statements from the repository, the context that is used to delete the statements is the one already assigned to the statement (RDF::Statement#context= or #graph=). So the two operations are not symmetric at all.

I'm going to do a PR in a few to adjust that behavior.

I can't get the contexts used inside a Sesame repository anymore. It loops infinitely until the stack level is too deep and it raises an error. It does the same when I try to list the statements using '#each_statement".

The code to trigger this behavior is pretty simple:

server = RDF::Sesame::Server.new(db_url)
repository = server.repository(repository_name')

# either this
repository.each_statement do |s| # <= each starts the infinite loop 
  puts s.inspect
end

# or this
puts repository.graph_names.inspect

I'm pushing a PR in a few minutes, I'll reference this issue.

Currently, connections are internally implemented using Net::HTTP from Ruby's standard library, and connections are always transient, i.e. they do not persist from one request to the next and must always be reopened when used.

We should implement support for persistent Keep-Alive connections as a future improvement.

This adapter does not contain any SPARQL support at present. To use a Sesame endpoint with SPARQL, see the SPARQL::Client gem.

Once the SPARQL client reaches a beta-quality level, we should add it as a dependency and have RDF::Sesame::Repository inherit from SPARQL::Client::Repository.

See https://github.com/ruby-rdf/rdf-sesame/blob/develop/lib/rdf/sesame/repository.rb#L311

Today the detection of SPARQL Construct to define the default format to text/plain is quite ugly (based on regular expression /bconstruct/b). It should be removed or enhance.

This adapter is not yet optimized for RDF.rb 0.2.x's bulk-operation APIs, meaning that statement insertions and deletions are currently performed one by one; this may affect the performance of loading large datasets into Sesame.

This should be addressed in an upcoming version.

Bug inserting RDF-XML based graphs into repositories.

I am able to insert NTriple based readers into a Sesame repository. However, RDFXML ones cannot be inserted. Here's what I've been trying:
require 'rdf'
require 'rdf/sesame'
require 'rdf/rdfxml'
repository = RDF::Sesame::Repository.new('http://localhost:8080/openrdf-sesame/repositories/test')

Successfully returns count of 47

reader = RDF::NTriples::Reader.new(File.read(RAILS_ROOT + '/public/doap.nt'))
repository.clear
repository.insert(reader)
repository.count

Only returns count of 3

reader = RDF::RDFXML::Reader.new(File.read(RAILS_ROOT + '/public/doap.xml'))
repository = RDF::Sesame::Repository.new('http://localhost:8080/openrdf-sesame/repositories/test')
repository.clear
repository.insert(reader)
repository.count

Graph count returns 47, but insertion into repository fails

stream = File.open(RAILS_ROOT + '/public/doap.xml')
graph = RDF::Graph.new
RDF::RDFXML::Reader.new(stream).each { |s| graph << s }
puts graph.count

Now that we have a graph, insert into repository

This inserts 3 entries, but not the entire 47

repository.clear
repository.insert(graph.to_a)
repository.count

Same thing, returns 3

repository.clear
repository.insert(*graph.to_a)
repository.count

Same thing, returns 3

repository.clear
repository<<graph.to_rdf
repository.count

The << method in writable.rb looks like it detects a graph and then

calls insert_graph, but none of these seem to work either

repository<<graph
repository.insert(graph)
repository.insert(graph.to_ntriples)
repository.insert(_graph.to_ntriples)
graph.each { |s| repository << s }
graph.each { |s| repository.insert(_s) }
graph.each { |s| repository.insert(s) }

stream = File.open(RAILS_ROOT + '/public/doap.xml')
graph = RDF::Graph.new
RDF::RDFXML::Reader.new(stream).each { |s| graph << s }
reader = RDF::NTriples::Reader.new(graph.to_ntriples)
repository.insert(reader)

I am able to get this to work with the RDF Context gem:
require 'rdf'
require 'rdf/sesame'
require 'rdf_context'
url = "http://localhost:8080/openrdf-sesame/repositories/test"
repository = RDF::Sesame::Repository.new(url)

The doap.xml file fails but rdf.xml does get parsed correctly

f = File.open(RAILS_ROOT + '/public/rdf.xml')
graph = RdfContext::Graph.new
graph.parse(f.read, nil, :type => :rdfxml)

statements = RDF::NTriples::Reader.new(graph.to_ntriples)
repository.insert(*statements)
repository.count
repository.clear!