The one tree (breaking out of the workspace)
Stephen Taylor, Arthur T. Whitney · ACM SIGAPL APL Quote Quad · 1984
The advent of enclosed arrays has provided an opportunity to bring into APL previously extra-lingual objects such as tokenstrings, packages and functions. By doing so a more formal and rigorous definition of APL is achieved. Within this definition many simplifications are possible, including the subsuming of workspaces, files, libraries and other 'entities' into arrays and functions. The work is being implemented on the Hewlett-Packard A900 minicomputer.