Domain vs Data Element
Data element contains the field label and documentation (F1 help). It contains the semantic characteristics of the field.
Domain contains the technical characteristics of a field, such as field length and data type.
Aggregate Objects are the data objects which composed of more than one table e. g. views.
Data Element vs. Domain
Domain: Defines the attributes such as length,type and possible value range.
Data element; An intermediate object between domain and table type
Domain : technical attributes of dataelement is called domain.
Dataelement : Symantic attributes are called dataelement.