Table 1 Example of Atomic Context Properties

1 (Device)

1 (Memory Size)

Kbytes

{Small, Medium, Large}

1 (Device)

2 (Screen Res.)

(length, width)

{Low, Medium, High}

1 (Device)

3 (OS)

String

{Linux, Symbian, …}

1 (Device)

4 (Media)

String

{Text, Image, Audio, Video}

2 (Environment)

1 (Net. Bandwidth)

Kbps

{Low, Medium, High}

2 (Environment)

2 (Ne.Security)

Boolean

{Secured, NonSecured}

2 (Environment)

3 (Time)

Date-time

{Current(yyyy:mm:dd;hh:mm:ss)}

3 (Learner)

1 (Authentication Info.)

String

{Username, Password}

3 (Learner)

2 (Language)

String

{English, French, …}

4 (Activity)

1 (Query)

String

{keyword, Domain-concept}