```ruby
require 'rdf'
require 'rdf/spec'
require 'rdf/spec/matchers'

RSpec.configure do |config|
  config.include(RDF::Spec::Matchers)
  config.exclusion_filter = {:ruby => lambda { |version|
    RUBY_VERSION.to_s !~ /^#{version}/
  }}
end

def fixture_path(filename)
  File.join(File.dirname(__FILE__), 'data', filename)
end
```

Add RSpec filter configurations to allow running just focused specs.
user
```ruby
require 'rdf'
require 'rdf/spec'
require 'rdf/spec/matchers'

RSpec.configure do |config|
  config.include(RDF::Spec::Matchers)
  config.filter_run :focus => true
  config.run_all_when_everything_filtered = true
  config.exclusion_filter = {:ruby => lambda { |version|
    RUBY_VERSION.to_s !~ /^#{version}/
  }}
end

def fixture_path(filename)
  File.join(File.dirname(__FILE__), 'data', filename)
end
```
assistant