Application catalogue There will be nodes that expose functional and non-functional attributes that define the shared applications. These nodes expose the metadata description of the applications. Such nodes will serve as application catalogues that can be browsed by consumers, much like an App Store where users find information on offered algorithms, machine learning models, and full software or applications. Infrastructure catalogue The infrastructure catalogue contains the list of all the available infrastructure services for the end users. It ensures that the end users can discover the existing services in an easy way. Data catalogue There will be nodes that expose functional and non-functional attributes that define the data. These nodes expose the metadata description of the data. Such nodes will serve as data catalogues that can be browsed by consumers https://confluence.simplprogramme.eu/display/SIMPL/Annex+6+-+Architecture+building+blocks The resource catalogue contains the list of all the available resources (data, application and infrastructure) for the consumers. It ensures that the providers can publish metadata description of their resources and consumers can discover the existing resources in an easy way.