From ALT Linux Wiki

Arch is a primary structure that represents Arch model, which implies architecture for builders and RPMs. It is described as:

  • slug is string mandatory write-once
Slug of the RPM architecture. Can contain only letters, digits and underscores. Is unique per system.
  • relative_path is string optional
File path part relative from the assembler's path base for exporting of the source or built RPMs.
  • names is Name array mandatory
Name array for the architecture. It can include the only title kind texts.
  • apps_count is positive mandatory read-only
Application count built for the architecture, excluding the noarch.