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

Code Display Definition
where Where This compartment rule is a condition for whether the rule applies.
requires requires This 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>