Display Logic Engine

Basic Principles

Using show and hide keywords indicates display logic.

The DSL engine follows these 3 principles when running:

1. Questions are visible by default
2. If a question uses show, it becomes hidden by default
3. Executes in DSL order, changing question visibility when conditions are met

Let's look at specific examples:

Scenario 1

if Q1A1 then show Q2

Before Answering

Statement	Engine Understanding	Q2 Visibility
	Initialize, Q2 uses show keyword, following principle 2	Hidden
if Q1A1 then show Q2	Q1A1 not answered, condition not met, ignore action	Hidden

Final result: Q2 is hidden

After Selecting Q1A1

Statement	Engine Understanding	Q2 Visibility
	Initialize, Q2 uses show keyword, following principle 2	Hidden
if Q1A1 then show Q2	Q1A1 answered, condition met, execute action	Visible

Final result: Q2 is visible

Scenario 2

if Q1A1 then show Q2
if Q1A2 then show Q2~3
if Q1A3 then show Q2~4

Before Answering

Statement	Engine Understanding	Q2 Visibility
	Initialize, Q2 uses show keyword, following principle 2	Hidden
if Q1A1 then show Q2	Q1A1 not answered, condition not met, ignore action	Hidden
if Q1A2 then show Q2~3	Q1A2 not answered, condition not met, ignore action	Hidden
if Q1A3 then show Q2~4	Q1A3 not answered, condition not met, ignore action	Hidden

Final result: Q2 is hidden

After Selecting Q1A2

Statement	Engine Understanding	Q2 Visibility
	Initialize, Q2 uses show keyword, following principle 2	Hidden
if Q1A1 then show Q2	Q1A1 not answered, condition not met, ignore action	Hidden
if Q1A2 then show Q2~3	Q1A2 answered, condition met, execute action	Visible
if Q1A3 then show Q2~4	Q1A3 not answered, condition not met, ignore action	Visible (retained previous state)

Final result: Q2 is visible