Ye Wang posted a diagram on Zulip (https://chat.fhir.org/#narrow/stream/179255-questionnaire/topic/Use.20cases.20for.20handling.20initial.2EvalueQuantity ) documenting the different cases that need to be handled when processing the units in initial.valueQuantity.  There are a lot of cases, so in the FHIR-I SDC call on 2023/9/7, it was thought some version of this diagram should be put into the SDC IG.  There was one place to correct:  In the first row, the last cell should say "string or Coding" instead of just "string".