An annotation must have at least one predicate/object.

Author: gkellogg

lib/rdf/turtle/reader.rb

@@ -443,7 +443,8 @@ def read_annotation(subject, predicate, object)
 
           # Statement becomes subject for predicateObjectList
           statement = RDF::Statement(subject, predicate, object)
-          read_predicateObjectList(statement)
+          read_predicateObjectList(statement) ||
+            error("Expected predicateObjectList", production: :annotation, token: @lexer.first)
           error("annotation", "Expected closing '|}'") unless @lexer.first === '|}'
           @lexer.shift
         end

rdf-turtle.gemspec

@@ -22,6 +22,8 @@ Gem::Specification.new do |gem|
   gem.requirements          = []
   gem.add_runtime_dependency     'rdf',             '~> 3.1', '>= 3.1.2'
   gem.add_runtime_dependency     'ebnf',            '~> 2.0'
+  gem.add_development_dependency 'erubis',          '~> 2.7'
+  gem.add_development_dependency 'htmlentities',    '~> 4.3'
   gem.add_development_dependency 'rspec',           '~> 3.9'
   gem.add_development_dependency 'rspec-its',       '~> 1.3'
   gem.add_development_dependency 'rdf-isomorphic',  '~> 3.1'