How the Central Reference File Database (CRD) works

The CRD is a centralised database hosted in Europe with defined access rules and user profiles. You will find it here. The Central Reference File Database consists of three elements:

  • Codes for companies and locations
  • Common Repository of Metadata for messages to be exchanged within TAF and TAP
  • Certificate Authority for a secure connection with the Common Interface.

The metadata for message exchange – XSD schemas – can be downloaded from the CRD. The schemas for each message are self-contained and include the code lists. These schemas can be downloaded and used directly for the Common Interface.

For the initial population of the database, Infrastructure Managers delivered their location codes in a specified CSV file to the RNE service desk. Updates at later stages will also be possible via CSV files.

Further maintenance can also be carried out by the ‘LocationFileDatasetMessage’ via the Common Interface.

 How to feed the Reference files


Download of the Reference Files via a web browser is supported in CSV or XML format. Users who operate Common Interface-scheduled replications are supported by a web service published on the CRD.

 Reference file distribution


RNE service support for CRD

RNE operates and maintains the database system, including user management. It provides user support for the import of CSV files and for maintenance by the ‘LocationFileDatasetMessage’.

RNE Members and Working Groups are involved in further development in order to enhance both the quality and quantity of the reference files. RNE provides support to RUs who wish to import their Subsidiary Location codes, if no national entity is in place in the relevant country.

The User Guide is available for download here.