1 Foreign Key : Its a field of one table which is also 
present in another table as a key field.

2. value table : it is defined at domain level and used 
mainly for search help perpose.

3. Data Element : semantic description of data is data 
element.

4. domain : it is technical description of data

Foriegn key: a field in one table is also present as a 
primary key field in another table.

value table: a refrence table used for F4 help,it consist 
of all the refrence values to be chencked by the 
table ,this table is called teh value table and the table 
which checks with it is the check table.

domain: describes the data type, it is the technical 
description of data.

data element: symantic description of fields.