This code system http://hl7.org/fhir/graph-compartment-use defines the following codes:

CodeDisplayDefinition
where WhereThis compartment rule is a condition for whether the rule applies.
requires requiresThis compartment rule is enforced on any relationships that meet the conditions.
<status value="active"/><experimental value="false"/><date value="2021-01-05T10:01:24+11:00"/><publisher value="HL7 (FHIR Project)"/><contact><telecom><system value="url"/><value value="http://hl7.org/fhir"/></telecom><telecom><system value="email"/><value value="fhir@lists.hl7.org"/></telecom></contact><description value="Defines how a compartment rule is used."/><jurisdiction><coding><system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/><code value="001"/><display value="World"/></coding></jurisdiction><caseSensitive value="true"/><valueSet value="http://hl7.org/fhir/ValueSet/graph-compartment-use"/><content value="complete"/><concept><code value="where"/><display value="Where"/><definition value="This compartment rule is a condition for whether the rule applies."/></concept><concept><code value="requires"/><display value="requires"/><definition value="This compartment rule is enforced on any relationships that meet the conditions."/></concept></CodeSystem>