Chapter 2-1: Data Dictionary Overview Cover Page 2-01:Field Types2-01:Physical Fields

Physical versus Logical Categories

Each of the APPX field types can be classified as physical or logical. The distinction between the two reflects a field’s physical space requirements.

Table 2-1-1 outlines the properties of physical and logical fields. Each is discussed in more detail in the sections that follow. You can also refer to Chapter 2-4: Files and Fields, for more information.

Fields

Assumes Attributes From

Defines New Physical Space

Physical Fields

Domain-Type Fields

Alpha Fields

Format Fields

System Fields

Text Fields

Token Fields

Numeric Fields

Date Fields

Logic Fields

Work Fields

 

Domain or Field

Field

Field

Field

Field

Field

Field

Field

Field

Domain or Work Field

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Logical Fields

Substring Fields

Synonym Fields

Group Fields

 

Alphanumeric Field

Any Field

One or More contiguous Fields

No

Subset of existing Field

Redefinition of existing Field

Redefinition of existing Field(s)

Table 2-1-1. Properties of Physical and Logical Fields

 

APPX Application Design Manual (01/13/03) Cover Page 2-01:Field Types2-01:Physical Fields

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