2-dimensional bar code

1. modern world

1.1. produce

1.1.1. public transport

1.1.2. tutorial class

1.1.3. goods

2. future

2.1. 3D code

3. background

3.1. history

3.2. creator

4. development

4.1. Aztec Code

4.2. Cyber Code

4.3. Data Matrix

4.4. High Capacity Color Barcode

4.5. QR Code

5. influence

5.1. business

5.2. life

5.3. education

5.4. techology