Differences

This shows you the differences between two versions of the page.

--- public:99_annexes:annex-b-terms-and-definitions:s:sequence [2026/09/12 17:42] – removed - external edit (Unknown date) 127.0.0.1
+++ public:99_annexes:annex-b-terms-and-definitions:s:sequence [2026/09/12 17:43] (current) – ↷ Links adapted because of a move operation nick_dido
@@ Line 1: / Line 1: @@
+====== Sequence ======
+[[public:99_annexes:annex-b-terms-and-definitions:start|Go up to Terms and Definitions]]
+===== Discussion =====
+A Sequence is an ordered or directed arrangement of elements with defined progression relationships among those elements.
+A Sequence can arrange:
+  * Activities
+  * Actions
+  * Operations
+  * Events
+  * States
+  * Instructions
+  * Messages
+  * Transactions
+  * Observations
+  * Measurements
+  * Decisions
+  * Other identifiable elements
+A Sequence can define:
+  * One or more initial elements
+  * Preceding elements
+  * Following elements
+  * Sequential progression
+  * Parallel progression
+  * Conditional progression
+  * Alternative progression
+  * Iterative progression
+  * Event-driven progression
+  * Error-handling progression
+  * Completion conditions
+  * Termination conditions
+Progression within a Sequence can depend on:
+  * Completion of an element
+  * An observed value
+  * An event
+  * A state
+  * A decision
+  * A condition
+  * A timeout
+  * An error
+  * Another defined progression criterion
+A Sequence can define:
+  * A total ordering in which each element has one determined position relative to every other element
+  * A partial ordering in which some elements can occur concurrently or without a required ordering
+  * Conditional alternatives in which the applicable progression depends on defined conditions
+  * Repetition in which an element can occur more than once
+===== Definition =====
+//ordered or directed arrangement of elements with defined progression relationships among those elements//
+===== Source =====
+Adapted from:
+  * [[https://www.omg.org/spec/TestIF/1.0/Beta3/PDF|OMG Test Information Interchange Format (TestIF), Version 1.0 Beta 3, Sections 7.3.4 and 7.3.14]]
+  * [[public:99_annexes:annex-b-terms-and-definitions:t:test_sequence|Test Sequence]]
+  * [[public:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Step]]
+  * DIDO Reference Implementation Conceptual Model
+  * DIDO-TE draft Requirements Register
+OMG TestIF represents a TestSequence as a directed arrangement of SequenceSteps. Each SequenceStep references the SequenceSteps that can follow it.
+This definition generalizes the arrangement and progression characteristics for use beyond testing.
+===== Note =====
+A Sequence differs from a set:
+  * A Sequence defines ordering or progression relationships among its elements
+  * A set groups elements without necessarily defining their ordering or progression
+A Sequence differs from a collection:
+  * A Sequence defines ordering or progression
+  * A collection groups elements without necessarily defining how they progress
+A Sequence differs from an individual element:
+  * A Sequence defines the arrangement and progression relationships
+  * An element occupies a position or participates in that progression
+A Sequence does not need to be strictly linear.
+A Sequence can include:
+  * Branches
+  * Parallel paths
+  * Conditional paths
+  * Repeated elements
+  * Error-handling paths
+  * Multiple completion points
+A Sequence defines permitted or expected progression. The occurrence of that progression is a separate concept.
+For testing:
+  * A [[public:99_annexes:annex-b-terms-and-definitions:t:test_sequence|Test Sequence]] defines permitted progression during [[public:99_annexes:annex-b-terms-and-definitions:t:test_execution|Test Execution]]
+  * A [[public:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Step]] identifies a position or occurrence within the Test Sequence
+  * An [[public:99_annexes:annex-b-terms-and-definitions:e:execution_path|Execution Path]] identifies the progression that actually occurred
+  * A [[public:99_annexes:annex-b-terms-and-definitions:t:test_run|Test Run]] records the Execution Path and its execution context
+A Sequence can have one element. In that case, the Sequence still identifies the element as the initial and completing element and can establish conditions applicable to its occurrence.
+Two Sequences can contain the same elements but define different ordering, progression, branching, or repetition.
+===== Example =====
+A Sequence contains the following activities:
+  * Establish a Test Environment
+  * Submit a transaction
+  * Observe the participating Nodes
+  * Evaluate the Test Results
+  * Preserve the Evidence
+The Sequence defines:
+  * Establishment of the Test Environment as the initial activity
+  * Transaction submission after successful establishment
+  * Concurrent observation of the participating Nodes
+  * Evaluation after all required observations complete
+  * Evidence preservation after evaluation
+  * An alternative error-handling path when establishment or transaction submission fails
+The activities form a Sequence because the arrangement defines their ordering and progression relationships.
+----
+<WRAP centeralign>
+© 2026 Dido Solutions, Inc. and Jackrabbit Consulting, Inc.
+</WRAP>