d4.06.12 sd_l_charge Data Structure# 1. Generalities 2. Item SD_L_CHARGES — Old Version 2.1. Arborescence 2.2. Contents of objects 3. Item SD_L_CHARGES — New version 3.1. Principles 3.2. SD content and access to information 3.3. Calculation of loads 3.4. Add a new load