stmSetShortLongDescription
stmSetShortLongDescription(stm_context, chart_name, element_name,
element_type, new_short_description, new_long_description)
Input/Output STM context descriptor that was returned by stmInitImport stm_chart / stm_activity / stm_state / stm_data_item / NULL means no change in current description
Empty string will erase current description NULL means no change in current description
Empty string will erase current description