Quote: represent a program as a tree of structure and reference nodes; a reference points to a node (its value); leaves are empty structures (atomic values); nodes have a descriptive label, e.g., "3256" for an atomic value

Quotation Skeleton

All code and data in Subtext is organized … At the leaves of the tree [of structures] are empty structures and references. Empty structures are often used … has a label, which is a string. … labels are purely comments, not identifiers. … Each primitive value [e.g., a Boolean or integer] is an empty structure … [e.g., "3256"].   Google-1   Google-2

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