Use document/description/definition consistently (3.1.1 port of 3908)

This tries to be consistent about using "describe" rather than "define"
and using "description" for the entire potentially-multi-document
thing, and "document" (or sometimes "description document") to
refer to individual documents in the description.

Author: handrews

versions/3.1.1.md

@@ -10,7 +10,7 @@ This document is licensed under [The Apache License, Version 2.0](https://www.ap
 
 The OpenAPI Specification (OAS) defines a standard, language-agnostic interface to HTTP APIs which allows both humans and computers to discover and understand the capabilities of the service without access to source code, documentation, or through network traffic inspection. When properly defined, a consumer can understand and interact with the remote service with a minimal amount of implementation logic.
 
-An OpenAPI definition can then be used by documentation generation tools to display the API, code generation tools to generate servers and clients in various programming languages, testing tools, and many other use cases.
+An OpenAPI description can then be used by documentation generation tools to display the API, code generation tools to generate servers and clients in various programming languages, testing tools, and many other use cases.
 
 For examples of OpenAPI usage and additional documentation, please visit [learn.openapis.org](https://learn.openapis.org/).
 
@@ -129,11 +129,11 @@ The OpenAPI Specification is versioned using a `major`.`minor`.`patch` versionin
 
 Occasionally, non-backwards compatible changes may be made in `minor` versions of the OAS where impact is believed to be low relative to the benefit provided.
 
-An OpenAPI document compatible with OAS 3.\*.\* contains a required [`openapi`](#oasVersion) field which designates the version of the OAS that it uses.
+An OpenAPI description document compatible with OAS 3.\*.\* contains a required [`openapi`](#oasVersion) field which designates the version of the OAS that it uses.
 
 ### Format
 
-An OpenAPI document that conforms to the OpenAPI Specification is itself a JSON object, which may be represented either in JSON or YAML format.
+An OpenAPI description document that conforms to the OpenAPI Specification is itself a JSON object, which may be represented either in JSON or YAML format.
 
 For example, if a field has an array value, the JSON array representation will be used:
 
@@ -154,7 +154,7 @@ In order to preserve the ability to round-trip between YAML and JSON formats, YA
 - Tags MUST be limited to those allowed by [YAML's JSON schema ruleset](https://yaml.org/spec/1.2/spec.html#id2803231), which defines a subset of the YAML syntax and is unrelated to [JSON Schema](https://tools.ietf.org/html/draft-bhutton-json-schema-00).
 - Keys used in YAML maps MUST be limited to a scalar string, as defined by the [YAML Failsafe schema ruleset](https://yaml.org/spec/1.2/spec.html#id2802346).
 
-**Note:** While APIs may be defined by OpenAPI documents in either YAML or JSON format, the API request and response bodies and other content are not required to be JSON or YAML.
+**Note:** While APIs may be described by OpenAPI documents in either YAML or JSON format, the API request and response bodies and other content are not required to be JSON or YAML.
 
 ### <a name="documentStructure"></a>OpenAPI Description Structure
 
@@ -2385,7 +2385,7 @@ For computing links, and providing instructions to execute them, a [runtime expr
 
 Field Name  |  Type  | Description
 ---|:---:|---
-<a name="linkOperationRef"></a>operationRef | `string` | A URI identifying an OAS operation. This field is mutually exclusive of the `operationId` field, and MUST point to an [Operation Object](#operationObject). Relative `operationRef` values MAY be used to locate an existing [Operation Object](#operationObject) in the OpenAPI definition. See the rules for resolving [Relative References](#relativeReferencesURI).
+<a name="linkOperationRef"></a>operationRef | `string` | A URI identifying an OAS operation. This field is mutually exclusive of the `operationId` field, and MUST point to an [Operation Object](#operationObject). Relative `operationRef` values MAY be used to locate an existing [Operation Object](#operationObject) in the OpenAPI description. See the rules for resolving [Relative References](#relativeReferencesURI).
 <a name="linkOperationId"></a>operationId  | `string` | The name of an _existing_, resolvable OAS operation, as defined with a unique `operationId`.  This field is mutually exclusive of the `operationRef` field.  
 <a name="linkParameters"></a>parameters   | Map[`string`, Any \| [{expression}](#runtimeExpression)] | A map representing parameters to pass to an operation as specified with `operationId` or identified via `operationRef`. The key is the parameter name to be used (optionally qualified with the parameter location, e.g. `path.id` for an `id` parameter in the path), whereas the value can be a constant or an expression to be evaluated and passed to the linked operation.
 <a name="linkRequestBody"></a>requestBody | Any \| [{expression}](#runtimeExpression) | A literal value or [{expression}](#runtimeExpression) to use as a request body when calling the target operation.
@@ -2395,9 +2395,9 @@ Field Name  |  Type  | Description
 This object MAY be extended with [Specification Extensions](#specificationExtensions).
 
 A linked operation MUST be identified using either an `operationRef` or `operationId`.
-In the case of an `operationId`, it MUST be unique and resolved in the scope of the OAS document.
+In the case of an `operationId`, it MUST be unique and resolved in the scope of the OpenAPI description.
 Because of the potential for name clashes, the `operationRef` syntax is preferred 
-for OpenAPI documents with external references.
+for multi-document OpenAPI descriptions.
 
 Note that it is not possible to provide a constant value to `parameters` that matches the syntax of a runtime expression.
 It is possible to have ambiguous parameter names, e.g. `name: id, in: path` and `name: path.id, in: query`; this is NOT RECOMMENDED and the behavior is implementation-defined, however implementations SHOULD prefer the qualified interpretation (`path.id` as a path parameter), as the names can always be qualified to disambiguate them (e.g. using `query.path.id` for the query paramter).
@@ -3303,7 +3303,7 @@ MyResponseType:
     propertyName: petType
 ```
 
-The expectation now is that a property with name `petType` _MUST_ be present in the response payload, and the value will correspond to the name of a schema defined in the OAS document.  Thus the response payload:
+The expectation now is that a property with name `petType` _MUST_ be present in the response payload, and the value will correspond to the name of a schema defined in the OpenAPI description.  Thus the response payload:
 
 ```json
 {
@@ -4138,23 +4138,23 @@ Two examples of this:
 
 ### OpenAPI Document Formats
 
-OpenAPI documents use JSON, YAML, and JSON Schema, and therefore share their security considerations:
+OpenAPI description documents use JSON, YAML, and JSON Schema, and therefore share their security considerations:
 - [JSON](https://www.iana.org/assignments/media-types/application/json)
 - [YAML](https://www.iana.org/assignments/media-types/application/yaml)
 - [JSON Schema Core](https://json-schema.org/draft/2020-12/json-schema-core#section-13)
 - [JSON Schema Validation](https://json-schema.org/draft/2020-12/json-schema-validation#name-security-considerations)
 
 ### Tooling and Usage Scenarios
 
-In addition, OpenAPI documents are processed by a wide variety of tooling for numerous different purposes, such as client code generation, documentation generation, server side routing, and API testing. OpenAPI document authors must consider the risks of the scenarios where the OpenAPI document may be used.
+In addition, OpenAPI description documents are processed by a wide variety of tooling for numerous different purposes, such as client code generation, documentation generation, server side routing, and API testing. OpenAPI description authors must consider the risks of the scenarios where the OpenAPI description may be used.
 
 ### Security Schemes
 
-An OpenAPI document describes the security schemes used to protect the resources it defines. The security schemes available offer varying degrees of protection. Factors such as the sensitivity of the data and the potential impact of a security breach should guide the selection of security schemes for the API resources. Some security schemes, such as basic auth and OAuth Implicit flow, are supported for compatibility with existing APIs. However, their inclusion in OpenAPI does not constitute an endorsement of their use, particularly for highly sensitive data or operations.
+An OpenAPI description describes the security schemes used to protect the resources it defines. The security schemes available offer varying degrees of protection. Factors such as the sensitivity of the data and the potential impact of a security breach should guide the selection of security schemes for the API resources. Some security schemes, such as basic auth and OAuth Implicit flow, are supported for compatibility with existing APIs. However, their inclusion in OpenAPI does not constitute an endorsement of their use, particularly for highly sensitive data or operations.
 
 ### Handling External Resources
 
-OpenAPI documents may contain references to external resources that may be dereferenced automatically by consuming tools. External resources may be hosted on different domains that may be untrusted. References in an OpenAPI document, or across OpenAPI documents may cause a cycle. Tooling must detect and handle cycles to prevent resource exhaustion.
+OpenAPI description documents may contain references to external resources that may be dereferenced automatically by consuming tools. External resources may be hosted on different domains that may be untrusted. References in an OpenAPI document, or across OpenAPI documents within a multi-document OpenAPI description, may cause a cycle. Tooling must detect and handle cycles to prevent resource exhaustion.
 
 ### Markdown and HTML Sanitization