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The Guilin Service IM allows for a (nested) Network Service (NS) model that is referenced from an ONAP Service. Multiple ONAP Services may reference the same NS Descriptor and multiple ONAP Service Instances may reference an NS Instance.
Since the NS can be composed VNFs, CNFs, PNFs and nested NSs, the ETSI NS model is well suited to describe the hierarchical structure of 3GPP Network Slice Subnets.
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