In the past, the terminology (domains vs. strata) has not always been consistent. Please interpret v023 as the stratification variable. That is what you should use in svyset, as in "svyset...., strata(v023)".

Sometimes v023 is empty. We are slowly producing a complete list of the stratification variable for all the surveys. In almost all cases, v023 (and/or the correct stratification variable) are the combinations of region (v024) and place of residence (v025). You can construct that with "egen stratumid=group(v024 v025)" and then "svyset....., strata(stratumid)". Actually I recommend "svyset....., strata(stratumid) singleunit(centered)", or another singleunit option, to avoid an error message.....