The Findable principle is about making sure that data is stored with a persistent identifier, well described with rich metadata and indexed in as many relevant searchable resources as appropriate. This allows data to always be able to be found by a single URL despite and changes or migrations and promotes its discovery across multiple platforms.
The Accessible principle ensures data can be accessed via standard non-proprietary protocols and metadata is stored in perpetuity. This allows the simple access of data now and future proofs the provenance of data in the event that it can’t be stored long term due to storage limitations.
The interoperable principle promotes the use of formal, accessible, shared and broadly accepted language for knowledge representation. This allows meta(data) to be accessed and retrieved in a number of different formats and promotes the free flow of data between systems.
The Reusable principle encourages researchers to upload (meta)data richly described to the domain-relevant community standards. This should provide enough context to allow a peer to understand, reproduce and build on top of the original work.