Complex networking devices often are chassis-based. These chassis allow for enhancement and/or augmentation of their base functionality by accepting additional chassis devices, similar to accepting functionality in the form of adding cards. This association models this capability.
CIM_PackageInSlot - child subclasses in ROOT\CIMV2\ms_409
'Complex networking devices often are chassis-based. These chassis allow for enhancement and/or augmentation of their base functionality by accepting additional chassis devices, similar to accepting functionality in the form of adding cards. This association models this capability.'