http://opencaesar.io/sierra/requirement#Requirement
Class requirement:Requirement

oml:type

oml:Concept

rdf:type

owl:Class

rdfs:subClassOf

	base:ContainableElement
	requirement:Requirement
	owl:Thing

directDomainOf

	requirement:derives → requirement:Requirement
	requirement:hasConstraint → requirement:Constraint
	requirement:hasRationale → xsd:string
	requirement:isDerivedFrom → requirement:Requirement
	requirement:isRefinedBy → requirement:Requirement
	requirement:justifies → requirement:DesignElement
	requirement:refines → requirement:Requirement
	requirement:specifies → requirement:DesignElement

directHasRestrictionOn

	base:contains → all values from requirement:Requirement
	base:contains → all values from requirement:Requirement
	base:isContainedBy → all values from requirement:Requirement
	base:isContainedBy → all values from requirement:Requirement