Okay, it seems that after gaining access to all materials, the answers for some of the questions above can be found in the DOCA SDK documentation. Just not necessarily at the particular applications’ descriptions (like in the case of URL Filter) but at the programming and DPI/RegEx applications’ documentations. It would be nice to have cross-references :)
Create DPI rules for the URL filter app: DPI Compiler :: NVIDIA DOCA SDK Documentation
Regarding the EAL flags, there is a note here: Application Recognition :: NVIDIA DOCA SDK Documentation
About representors: vSwitch and Representors Model :: NVIDIA DOCA SDK Documentation
Thanks