[lemma=type] [word=□]
[lemma=type] [word=systems]
I am also actively working on type systems and implementation of multi-staged programming . Specifically , I focus on type systems that ensure the safe allocation , update , and reuse of memory . And Breece Hill type systems , with both fixed and removable media , will require an extra encryption control layer to keep the local encryption keys separate from the keys used on tape cartridges . We discuss several treatments of data in languages : untyped universes of values , monomorphic type systems , and polymorphic type systems . I think that generalized link typing systems have been too generalized to be useful , and only application-specific ones such as those used for court case citations end up adding real value . The key challenges faced by these projects range from appropriate type systems , to the proper integration of query semantics , to the meeting of high performance bars .