The API guide describes entry points that can be used to interact with the catalog.
The GeoNetwork API allows to manage all the catalog (eg. users, groups, editing, formatter, processing).
The main GeoNetwork search service for fast and flexible record retrieval.
Catalog Service for the Web
The OGC Industry standard to search, retrieve record in XML format. Can be used to manage records with transaction operation.
GeoNetwork 3.12.x only:
OpenSearch and INSPIRE ATOM
Open Archive Initiative
No longer supported: