LaTiS version 3 is a rewrite of the Functional Data Model and Algebra based on lessons learned from version 2, and with a bit more inspiration from Functional Programming. It will incubate as LaTiS3 version 0.x until we are ready to finalize the API and release it as LaTiS version 3.x.
The primary distinction of LaTiS 3 is the perspective of a Dataset as a sequence of Samples with Operations that implement the Functional Algebra in terms of pure functions applied to Samples. Special implementations of FunctionData facilitate nested Functions and optimal operations on data.
Another distinction of LaTiS 3 is to completely de-couple the model from the data. The Data algebraic data type has no knowledge of the DataType algebraic data type and vice versa. Only at the Dataset level do the two concepts become combined.
The usual collection of Adapters and Writers are conceptually similar but take better advantage of the new data model implementation. The Adapter life cycle, in particular, is much cleaner. This new version of LaTiS will continue to support the same service interface (and more).
see glossary here
see design decisions here