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17 changes: 17 additions & 0 deletions pages/learn/glossary.md
Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,10 @@ A property appearing within a [schema](#schema) object.

The [JSON Schema specification](../specification) defines behavior for a large library of keywords which can be used to describe [instances](#instance).

### implementation

Historically, the word "implementation" has been used to describe both specifically validators/annotators (interpreted as strictly operating as the spec describes) and also various other kinds of JSON Schema tooling. However, due to this ambiguity, we have decided that the preferred conversational term should be ["tooling"](#tooling).

### instance

A piece of JSON data which is to be described by a [schema](#schema).
Expand Down Expand Up @@ -112,6 +116,19 @@ Said more plainly, whether a particular value is a subschema or not depends on i

Subschemas may themselves contain sub-subschemas, though colloquially one generally uses the term "subschema" regardless of the level of nesting, further clarifying which larger schema is the parent schema whenever needed.

### tooling

A JSON Schema tool (or colloquially "tooling") is any software application or library for working with or evaluating schemas in some way that does not contradict the JSON Schema specification.

The following are considered tools:

- a validator library
- a CLI validator
- a schema or code generator
- a UI form generator

Applications which use JSON Schema internally without exposing that functionality in some way, for example, validating configuration files or web requests, are not considered tooling.

### vocabulary

A tightly related collection of [keywords](#keyword), grouped to facilitate re-use.
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