A field specification incorporates various elements that define every attribute of a field. All of the elements within the specification are categorized as general elements, physical elements, or logical elements. These element categories enable you to focus on a distinct aspect of the field as you're defining the specification, and they provide a way for you to find a particular element quite easily.
Here are the elements within each category:
General Elements: Field Name, Parent Table, Label, Specification Type, Source Specification, Shared By, Alias(es), Description
Physical Elements: Data Type, Length, Decimal Places, Character Support, Input Mask, Display Format
Logical Elements: Key Type, Key Structure, ...