The catalog support the following standards:
- Geographic information – Metadata (iso19115-3.2018)
- Geographic information – Metadata (iso19139:2007) (iso19139)
- Geographic information – Methodology for feature cataloguing (iso19110)
- Dublin core (dublin-core)
ISO19110 can be used to encode feature catalogue (but ISO19115-3 is recommended).
Dublin core (for CSW only) is only used to test OGC CSW testsuites.
Others standards and community profiles are available on https://github.com/metadata101.