public function getDefinitionDimensionMembers()
	{
		if ( $this->dimensionMembersCache !== null ) return $this->dimensionMembersCache;

		$dimensionMembers = array();

		foreach ( $this->getDefinitionRoleRefs() as $roleRefsKey => $role )
		{
			$dimensionMembers += $this->getDefinitionRoleDimensionMembers( $roleRefsKey );
		}

		$this->dimensionMembersCache = $dimensionMembers;
		return $dimensionMembers;
	}