glossary: Add terms

eng/fv/approaches.rst

@@ -168,7 +168,7 @@ in such a way that tests can be generated using the SPIN model checker
 Promela is quite a low-level modelling language that makes it easy to get close
 to code level, and is specifically targeted to modelling software. It is one of
 the most widely used model-checkers, both in industry and education. It uses
-assertions, and :term:`Linear Temporal Logic` (LTL) to express properties of
+assertions, and :term:`Linear Temporal Logic` (:term:`LTL`) to express properties of
 interest.
 
 Given a Promela model that checks key properties successfully,

eng/fv/overview.rst

@@ -30,9 +30,9 @@ such as a specification. This relationship is commonly referred to as a
 
 Often it is quite difficult to get a useful formal model of real code. Some
 formal modelling approaches are capable of generating machine-readable
-:term:`scenarios` that describe possible correct behaviors of the system at the
-relevant level of abstraction. A refinement for these can be defined by
-using them to generate test code.
+:term:`scenarios <scenario>` that describe possible correct behaviors of the
+system at the relevant level of abstraction. A refinement for these can be
+defined by using them to generate test code.
 This is the technique that is used in :ref:`FormalVerifMethodology` to
 verify parts of RTEMS. Formal models are constructed based on requirements
 documentation, and are used as a basis for test generation.

eng/glossary.rst

@@ -1,5 +1,6 @@
 .. SPDX-License-Identifier: CC-BY-SA-4.0
 
+.. Copyright (C) 2022, 2023 Trinity College Dublin
 .. Copyright (C) 2017, 2019 embedded brains GmbH & Co. KG
 .. Copyright (C) 1988, 1998 On-Line Applications Research Corporation (OAR)
 
@@ -39,6 +40,10 @@ Glossary
         This term is an acronym for
         `Executable and Linkable Format <https://en.wikipedia.org/wiki/Executable_and_Linkable_Format>`_.
 
+    formal model
+        A model of a computing component (hardware or software) that has a
+        mathematically based :term:`semantics`.
+
     GCC
         This term is an acronym for `GNU Compiler Collection <https://gcc.gnu.org/>`_.
 
@@ -64,15 +69,15 @@ Glossary
         This term is an acronym for Independent Software Verification and Validation.
 
     Linear Temporal Logic
-        This is a logic that states properties about
-        (possibly infinite) sequences of states.
+        This is a logic that states properties about (possibly infinite) sequences of
+        states.
 
     LTL
-        This term is an acronym for Linear Temporal Logic.
+        This term is an acronym for :term:`Linear Temporal Logic`.
 
     refinement
-        A *refinement* is a relationship between a specification
-        and its implementation as code.
+        A *refinement* is a relationship between a specification and its
+        implementation as code.
 
     reification
         Another term used to denote :term:`refinement`.
@@ -84,6 +89,17 @@ Glossary
     RTEMS
         This term is an acronym for Real-Time Executive for Multiprocessor Systems.
 
+    scenario
+        In the context of formal verification, in a setting that involves many
+        concurrent tasks that interleave in arbitrary ways, a scenario describes a
+        single specific possible interleaving.  One interpretation of the behaviour
+        of a concurrent system is the set of all its scenarios.
+
+    semantics
+        This term refers to the meaning of text or utterances in some language.  In a
+        software engineering context these will be programming, modelling or
+        specification languages.
+
     software component
         This term is defined by ECSS-E-ST-40C 3.2.28 as a "part of a software
         system".  For this project a *software component* shall be any of the