data structure

A data structure is a particular way of organizing data in a computer for efficient access and modification. It is a specific kind of representation — a structured encoding of information — not an abstraction (which is a property, not a kind per Law 9a).

A database IS a specific kind of data structure: an organized collection of data stored and retrieved electronically. Files against nearest kind 'data structure'. Direction: specific (database) → general (data structure). Tested: a database is a kind of data structure per Law 9.

A spreadsheet IS a specific kind of data structure: a grid-based arrangement of data in rows and columns for organization and computation. Files against nearest kind 'data structure'. Direction: specific (spreadsheet) → general (data structure). Tested: a spreadsheet is a kind of data structure per Law 9.

A time series IS a specific kind of data structure — it is data ordered sequentially by time, where each value is associated with a timestamp. The removal test confirms INSTANCE_OF: a time series is a kind of structured data organization.

A queue is a specific kind of data structure where elements are ordered and accessed in FIFO (first-in, first-out) order. A competent speaker would call a queue 'a data structure.' This is a direct INSTANCE_OF relation against the nearest kind.

A graph is a specific kind of data structure — a collection of nodes and edges representing relationships. Directories a competent speaker to call a graph a data structure. Nearest kind: graph is a structured way to organize and traverse data.

kv-cache IS a specific kind of data structure: it stores key-value pairs for efficient lookup during autoregressive generation. A competent speaker would call a kv-cache 'a data structure.' The nearest kind is data structure, which is already ACCEPTED.

An audio-buffer is a FIFO ring buffer used in digital audio systems to temporarily hold samples. It is a specific instantiation of the general data structure concept — a bounded sequence of elements with FIFO access semantics, specialized for audio sample management. Direction: specific → general, INSTANCE_OF.

Tree is a specific kind of data structure used to represent hierarchical information with nodes connected by edges, where each node has zero or more children.

Pinned sense: tree-data-structure as its accepted definition carves it - "a human-made hierarchical data structure: a finite set of nodes in which one distinguished root node has zero or more child nodes, every non-root node has exactly one parent, and no cycle occurs". The definition names its own kind in the first clause. The target s accepted definition carves a data structure as "a method of organizing information in a computational context such that the data can be accessed, traversed, and modified efficiently", parameterized by logical arrangement, operations, and physical representation, and its own text lists "trees enable hierarchical navigation" among the canonical structures. A tree is exactly that carve with hierarchy-plus-acyclicity as the organization relation. Nearest accepted kind: data structure is the immediate parent kind - the board already accepts binary-tree INSTANCE_OF tree-data-structure, so this edge completes the ladder (binary-tree -> tree-data-structure -> data structure) with no nearer rung existing.