Syntax

                ('field_name', 'operator', value)

1.field_name : a valid name of field of the object model or in the database table
2. operator : valid operators are =, !=, >, >=,
3. value : a valid value to compare with the values of field_name, depending on its type

1. Single condition

if field1 = 10

              domain = [('field1','=',10)]

              OR

              domain = [('field1','=','field2')]

2. Condition AND

if field1 = 5 and field2 = 10

domain = [('field1','=',5),('field2','=',10)]

OR

domain = [('field1','=',field3),('field1','=',field3)]

3. Condition OR

if field1 = 5 or field2 = 10

domain = ['|', ('field1','=',5),('field2','=',10)]

OR

domain = ['|', ('field1','=',field3),('field1','=',field3)]

4. Multiple Condition

field1 = 5 or (field2 ! = 10 and field3 = 12)

domain = ['|',('field1','=',5),('&',('field2','!=',10),('field3','=','12'))