Here is a list of all namespaces with brief descriptions:

[detail level 12345]

Ncrow
Ndir_tags
Nerror_codes	PACS-specific error codes
▼Nkcenon
▼Ncommon
Ninterfaces
Nlogger
▼Nnetwork
Ninterfaces
Nsession
▼Npacs
▼Nai
Naira_tags
Njson_util
Nmanager_tags
Nmetrics
Nsop_class
Nclient
Ncompat
▼Ncore
Ntags
Ndcm_modify
▼Ndi
Ntest
▼Nencoding
Ncompression
►Nsimd
Ndetail
Nerror_codes
Nevents
Nexample
▼Nintegration
Nmetrics
Nintegration_test
Nmonitoring
▼Nnetwork
Ndetail
Ndimse
Npipeline
Nv2
▼Nsecurity
NAction	Specific actions that can be performed
Natna_event_ids
Natna_event_types
Natna_object_id_types
Natna_role_ids
Nhipaa_identifiers	HIPAA Safe Harbor identifiers (18 categories)
▼Nservices
Ncache
Nmonitoring
Nmpps_tags
Npir
Nprint_tags
►Nsop_classes
Nophthalmic_tags
Nparametric_map_tags
Nsr_template	Common SR Template IDs (TID)
Nwsi_tags
Nups_tags
►Nvalidation
Nct_processing_tags
Nct_tags
Ndx_tags
Nheightmap_seg_tags
Nlabel_map_seg_tags
Nmg_tags
Nmr_tags
Nnm_tags
Nophthalmic_iod_tags
Npet_tags
Npmap_iod_tags
Nrt_tags
Nseg_tags
Nsr_tags
Nwaveform_tags
Nwsi_iod_tags
Nxa_tags
►Nxds
Nconsumer_tags
Nkos_tags
Nstorage
▼Nweb
►Nauth
Ndicomweb_scopes	Standard OAuth 2.0 scopes for DICOMweb operations
Ndicomweb
Nendpoints
Nstorage_commitment
Nwado_uri
▼Nworkflow
Nlock_error	Error codes for lock operations
Nthread
Nlocal_tags
▼Nnetwork_system
Nsession
▼Npacs
▼Ncore
Nevents
▼Ndi
Ntest
▼Nencoding
Ncompression
Nsimd
Nintegration
Nmonitoring
▼Nnetwork
Ndimse
Nv2
Nsecurity
▼Nservices
Ncache
Nvalidation
Nstorage
▼Nweb
Ndicomweb
Nworkflow
Nquery_scu
Nts	Transfer Syntax UIDs
Nworklist_cli