• (Addition) Add initial implementation for Attean::MutableTripleModel.
  
• (Addition) Add logging of costs to query planner (#56 from KjetilK).
  
• (Addition) Add use of MooX::Log::Any (from KjetilK).
  
• (Addition) Added
  Attean::API::Plan->subplans_of_type_are_variable_connected method.
  
• (Addition) Added Attean::API::Plan->children_are_variable_connected.
  
• (Addition) Added AtteanX::Parser::SPARQL->parse convenience method.
  
• (Addition) Added RDF/XML parser tests.
  
• (Addition) Added Turtle serializer.
  
• (Addition) Added exportable quadpattern constructor.
  
• (Addition) Added tests for get_sequence model accessor method (#3).
  
• (Update) Change API for Attean::API::CostPlanner->cost_for_plan to pass
  in the query planner.
  
• (Update) Fix bug in handling unbound join variables in hash join
  evaluation.
  
• (Update) Fix use of blank and variable shortcut constructors (#57 from
  KjetilK).
  
• (Update) Fixed bug in
  AtteanX::Serializer::SPARQLHTML->serialize_iter_to_bytes.
  
• (Update) Implementation of canonicalize method for triple and quad
  patterns (#43 from KjetilK).
  
• (Update) Improve Attean::ExistsExpression->as_string.
  
• (Update) Improve cost estimation for cartesian joins in
  Attean::API::QueryPlanner.
  
• (Update) Improved SPARQL serialization of algebra and expression trees
  (including #51).
  
• (Update) Improved error handling in Attean::ListIterator->BUILD.
  
• (Update) Improved recognition of invalid aggregation queries.
  
• (Update) Make regexes used for prefixname parsing publicly accessibly.
  
• (Update) Merged shared constants for Turtle and SPARQL tokens.
  
• (Update) Moved subpatterns_of_type from Attean::API::Algebra to
  Attean::API::DirectedAcyclicGraph.
  
• (Update) Renamed parse_term_from_string methods to parse_term_from_bytes
  (adding delegating methods that should be decprecated in the future).
  
• (Update) Silence XML::Parser warnings on empty input documents.
  
• (Update) Update AtteanX::Parser::RDFXML to populate a namespace map
  during parsing.
  
• (Update) Updated Attean::API::CanonicalizingBindingSet to produce the
  same type of object as are input.
  
• (Update) Updated copyright years.