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The DOI System supports any type of physical, digital or abstract entities, and of hierarchies and relationships between entities.

Through its scalable architecture, the DOI System is able to handle very large volumes of registrations and resolutions of DOI names. In fact, the DOI System is made up of Local Handle Services (LHS) of the Handle System (an LHS manages the DOI names under one or several prefixes): each LHS may be replicated into multiple service sites and each service site may consist of multiple computers (servers). It means that service requests targeted at any LHS can be distributed into different service sites, and into different servers within any service site.