This is the ValueSet that contains all the codes in Accessibility VS (http://hl7.org/fhir/us/davinci-pdex-plan-net/ValueSet/AccessibilityVS) and Accessibility VS (http://hl7.org/fhir/us/davinci-pdex-plan-net/ValueSet/AccessibilityVS). E.g. what you have to deal with if you get resources containing codes in either of them