3GPP 38.300 v19.3.0 — the document's own text

4.8 Non-Public Networks

Taught in 4. What NR is — the shape of the 5G radio network (TSG RAN — the group that specifies the radio, in depth), 4. What NR actually is, in the shape its own document gives it (TSG RAN — the group that specifies the radio, overview).

A Non-Public Network (NPN) is a network for non-public use (see TS 22.261 [19]), which can be deployed as (see TS 23.501 [3]):

a Stand-alone Non-Public Network (SNPN) when not relying on network functions provided by a PLMN; or
a Public Network Integrated (PNI) NPN when relying on the support of a PLMN.

NOTE: As described in clause 5.30.3.1 of TS 23.501 [3], there are several approaches in which PNI-NPNs can be made available via PLMNs. The only approach visible to AS, and hence the only approach that is addressed in AS specifications is the approach of using CAGs.