III
The Facet Language
The basic unit of Rosetta specification is the facet. Each facet describes one
domain-specific system model. Each facet extends a domain, called its type,
that provides a domain-specific modeling vocabulary and semantic basis.
Facets are parameterized and may define local items. Facet properties are
defined by a collection of terms that are either Boolean or facet valued.
Boolean terms define properties directly while facet terms define structure
by instantiating and interconnecting facets.
Part III describes the Rosetta the facet language used to encapsulate items
in structures that define system models. The facet language is used to define
and assign domains to facets, define packages containing specifications and
libraries where they are stored, and components that encapsulate functional
requirements, usage assumptions and correctness conditions.
After completing the chapters in Part III, you will understand how
to declare facets, compose facets into structural specifications, define and
use components, define libraries, and group specifications together into
packages.
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