What is MPEG-4 Simple Profile level 0?

In MPEG-4 14496-2, there is no definition of Simple Profile level 0, the smallest is simple profile Level 1, so what is simple profile level 0? As follows:

 

I have heard of a level 0 for Simple Profile, what is it?

Level 0 of the Simple Profile was designed to target to the wireless industry where screen sizes are small, and processing power is low. level 0 has the same functionality as the other simple profile levels but with the following additional restrictions.

1. The maximum frame rate shall be 15 frames per second;
2. The maximum f_code shall be 1;
3. The intra_dc_vlc_threshold shall be 0;
4. The maximum horizontal luminance pixel resolution shall be 176 pels/line;
5. The maximum vertical luminance pixel resolution shall be 144 pels/VOP;
6. If AC prediction is used, the following restriction applies: QP value shall not be changed within a VOP (or within a video packet if video packets are used in a VOP ). if AC prediction is not used, there are no restrictions to changing QP value.

Level 0 is available in the streaming video profile amendment.