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Reference Guide
This guide describes conceptual information about data design environment components when you want to use the data fabrication feature in HCL OneTest™ Server.
Schema design
A schema is a graphical data dictionary that contains metadata definitions of the structure of a document to generate test data. Schema provides visual cues for understanding the structure and complete definition of an object.
Functions and expressions
Expressions and evaluations
Expressions that evaluate to NONE
When an operand evaluates to NONE

Reference Guide
This guide describes conceptual information about data design environment components when you want to use the data fabrication feature in HCL OneTest™ Server.
- Files
  You add a file to a project to use it as input in the project. You can upload a file from your local file system to a project from the Files tab to generate test data. Alternatively, you can upload it when you define an action.
- Connections
  A connection defines the properties that are required to connect to an external resource. An action uses a connection to provide source data to a project or write data from a source to a target. Multiple actions can use the same connection. You can define both connections and actions at the project level.
- Schema design
  A schema is a graphical data dictionary that contains metadata definitions of the structure of a document to generate test data. Schema provides visual cues for understanding the structure and complete definition of an object.
  - Introduction to schema design
    Use the Schemas tab to define, modify, and view schemas. A schema describes the syntax, structure, and semantics of your data.
  - Type properties
    The properties of a type define the characteristics of the data objects of that type.
  - Item restrictions
    Item restrictions are an optional feature you can use to specify valid or invalid data objects for an item type. Item restrictions are grouped into three categories: Value, Character, and Range.
  - Components
  - Partitioning
  - Type inheritance
  - Schema analyzer
  - Distinguishable objects
  - Functions and expressions

When an operand evaluates to NONE

The following table explains how an operator expression evaluates when an operand evaluates to none.

The symbol A represents one operand of the expression and B represents the other operand. The symbol != means not equal to.


Operator Expression	Condition	Evaluates to:
A / B	A = NONE B = NONE	NONE
A*B	A = NONE B = NONE	NONE
A / B	A != NONE B = NONE	0
A*B	A != NONE B = NONE	0
A + B	A = NONE B = NONE	NONE
A - B	A = NONE B = NONE	NONE
A + B	A = NONE B != NONE	B
A - B	A = NONE B != NONE	-B
A + B	A != NONE B = NONE	A
A - B	A != NONE B = NONE	A
A > B	A = NONE B = NONE	FALSE
A < B	A = NONE B = NONE	FALSE
A = B	A = NONE B = NONE	TRUE
A > B	A = NONE B != NONE	FALSE
A < B	A = NONE B != NONE	TRUE
A = B	A = NONE B != NONE	FALSE
A > B	A != NONE B = NONE	TRUE
A < B	A != NONE B = NONE	FALSE
A = B	A != NONE B = NONE	FALSE

For example, in this operator expression:

Total = #Guests + 1

if #Guests evaluates to "none", the value for Total will be 1.