Core.Declarations.GlobalDeclarations

Classification

Name	Global Declarations
Short Description	Global variables and constants
Class	OTX Core
Pre-Conditions	-
Specified by	ISO 13209-2

Introduction

The following elments can be declared in the global declaration block:

• Global Constants
• Context Variables
• Document Variables

These elements have a global scope. That is, they can be used within the document in which they are declared, as well as in other documents, see Imports.

Semantics

Global Constant

The value of a global constant is set at design-time and can not be changed at runtime. The global constants must have one of the following Visibilities:

• Private (default)
• Package
• Public

A constant has a Type and a value corresponding to the type.

Global Variable (Document Variable)

The value of a global variable can be changed at runtime. Global variables can only be used in the same document. Therefore, they only have one following Visibility:

• Private (fixed)

A variable has a Type and an initial value (default value) corresponding to the type.

Environment Variable (Context Variable)

Context variables behave like global constants. However, they have a special meaning. They represent environment-related data, such as vehicle type, name of workshop, user login name, etc., see the Context Concept. The context variables must have one of the following Visibilities:

• Private (default)
• Package
• Public

A context variable has a Type and a default value corresponding to the type.

Checker rules

Core_Chk009	Mandatory constant initialisation
Core_Chk051	Immutability of constants, input parameters and context variables
Core_Chk052	Identifier shadowing

See also

Validation (OTX-Checker)
​​Naming Conventions
Imports
Visibilities
Validities
Signatures
Parameter Declarations
Procedures
Comments