Standardise description commonmark wording

MikeRalphson · MikeRalphson · commit 3d478376ad5a · 2017-07-13T13:59:15.000+01:00
diff --git a/versions/3.0.md b/versions/3.0.md
@@ -210,7 +210,7 @@ The metadata can be used by the clients if needed, and can be presented in editi
 Field Name | Type | Description
 ---|:---:|---
 <a name="infoTitle"></a>title | `string` | **REQUIRED**. The title of the application.
-<a name="infoDescription"></a>description | `string` | A short description of the application. [CommonMark syntax](http://spec.commonmark.org/) can be used for rich text representation.
+<a name="infoDescription"></a>description | `string` | A short description of the application. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation.
 <a name="infoTermsOfService"></a>termsOfService | `string` | A URL to the Terms of Service for the API. MUST be in the format of a URL.
 <a name="infoContact"></a>contact | [Contact Object](#contactObject) | The contact information for the exposed API.
 <a name="infoLicense"></a>license | [License Object](#licenseObject) | The license information for the exposed API.
@@ -319,7 +319,7 @@ An object representing a Server.
 Field Name | Type | Description
 ---|:---:|---
 <a name="serverUrl"></a>url | `string` | **REQUIRED**. A URL to the target host.  This URL supports Server Variables and MAY be relative, to indicate that the host ___location is relative to the ___location where the OpenAPI definition is being served. Variable substitutions will be made when a variable is named in `{`brackets`}`.
-<a name="serverDescription"></a>description | `string` | An optional string describing the host designated by the URL. [CommonMark syntax](http://spec.commonmark.org/) can be used for rich text representation.
+<a name="serverDescription"></a>description | `string` | An optional string describing the host designated by the URL. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation.
 <a name="serverVariables"></a>variables | Map[`string`, [Server Variable Object](#serverVariableObject)] | A map between a variable name and its value.  The value is used for substitution in the server's URL template.
 
 This object can be extended with [Specification Extensions](#specificationExtensions). 
@@ -430,7 +430,7 @@ Field Name | Type | Description
 ---|:---:|---
 <a name="serverVariableEnum"></a>enum | [`string`] | An enumeration of string values to be used if the substitution options are from a limited set.
 <a name="serverVariableDefault"></a>default | `string` |  **REQUIRED**. The default value to use for substitution, and to send, if an alternate value is _not_ supplied. Unlike the [Schema Object's](#schemaObject) `default`, this value MUST be provided by the consumer.
-<a name="serverVariableDescription"></a>description | `string` | An optional description for the server variable. [CommonMark syntax](http://spec.commonmark.org/) can be used for rich text representation.
+<a name="serverVariableDescription"></a>description | `string` | An optional description for the server variable. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation.
 
 This object can be extended with [Specification Extensions](#specificationExtensions). 
 
@@ -714,7 +714,7 @@ Field Name | Type | Description
 ---|:---:|---
 <a name="pathItemRef"></a>$ref | `string` | Allows for an external definition of this path item. The referenced structure MUST be in the format of a [Path Item Object](#pathItemObject). If there are conflicts between the referenced definition and this Path Item's definition, the behavior is *undefined*.
 <a name="pathItemSummary"></a>summary| `string` | An optional, string summary, intended to apply to all operations in this path.
-<a name="pathItemDescription"></a>description | `string` | An optional, string description, intended to apply to all operations in this path. [CommonMark syntax](http://spec.commonmark.org/) can be used for rich text representation.
+<a name="pathItemDescription"></a>description | `string` | An optional, string description, intended to apply to all operations in this path. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation.
 <a name="pathItemGet"></a>get | [Operation Object](#operationObject) | A definition of a GET operation on this path.
 <a name="pathItemPut"></a>put | [Operation Object](#operationObject) | A definition of a PUT operation on this path.
 <a name="pathItemPost"></a>post | [Operation Object](#operationObject) | A definition of a POST operation on this path.
@@ -823,7 +823,7 @@ Field Name | Type | Description
 ---|:---:|---
 <a name="operationTags"></a>tags | [`string`] | A list of tags for API documentation control. Tags can be used for logical grouping of operations by resources or any other qualifier.
 <a name="operationSummary"></a>summary | `string` | A short summary of what the operation does.
-<a name="operationDescription"></a>description | `string` | A verbose explanation of the operation behavior. [CommonMark syntax](http://spec.commonmark.org/) can be used for rich text representation.
+<a name="operationDescription"></a>description | `string` | A verbose explanation of the operation behavior. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation.
 <a name="operationExternalDocs"></a>externalDocs | [External Documentation Object](#externalDocumentationObject) | Additional external documentation for this operation.
 <a name="operationId"></a>operationId | `string` | Unique string used to identify the operation. The id MUST be unique among all operations described in the API. Tools and libraries MAY use the operationId to uniquely identify an operation, therefore, it is RECOMMENDED to follow common programming naming conventions.
 <a name="operationParameters"></a>parameters | [[Parameter Object](#parameterObject) \| [Reference Object](#referenceObject)] | A list of parameters that are applicable for this operation. If a parameter is already defined at the [Path Item](#pathItemParameters), the new definition will override it but can never remove it. The list MUST NOT include duplicated parameters. A unique parameter is defined by a combination of a [name](#parameterName) and [___location](#parameterIn). The list can use the [Reference Object](#referenceObject) to link to parameters that are defined at the [OpenAPI Object's components/parameters](#componentsParameters).
@@ -954,7 +954,7 @@ Allows referencing an external resource for extended documentation.
 
 Field Name | Type | Description
 ---|:---:|---
-<a name="externalDocDescription"></a>description | `string` | A short description of the target documentation. [CommonMark syntax](http://spec.commonmark.org/) can be used for rich text representation.
+<a name="externalDocDescription"></a>description | `string` | A short description of the target documentation. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation.
 <a name="externalDocUrl"></a>url | `string` | **REQUIRED**. The URL for the target documentation. Value MUST be in the format of a URL.
 
 This object can be extended with [Specification Extensions](#specificationExtensions). 
@@ -992,7 +992,7 @@ Field Name | Type | Description
 ---|:---:|---
 <a name="parameterName"></a>name | `string` | **REQUIRED**. The name of the parameter. Parameter names are *case sensitive*. <ul><li>If [`in`](#parameterIn) is `"path"`, the `name` field MUST correspond to the associated path segment from the [path](#pathsPath) field in the [Paths Object](#pathsObject). See [Path Templating](#pathTemplating) for further information.<li>If [`in`](#parameterIn) is `"header"` and the `name` field is `"Accept"`, `"Content-Type"` or `"Authorization"`, the parameter definition SHALL be ignored.<li>For all other cases, the `name` corresponds to the parameter name used by the [`in`](#parameterIn) property.</ul>
 <a name="parameterIn"></a>in | `string` | **REQUIRED**. The ___location of the parameter. Possible values are "query", "header", "path" or "cookie".
-<a name="parameterDescription"></a>description | `string` | A brief description of the parameter. This could contain examples of use.  [CommonMark syntax](http://spec.commonmark.org/) can be used for rich text representation.
+<a name="parameterDescription"></a>description | `string` | A brief description of the parameter. This could contain examples of use.  [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation.
 <a name="parameterRequired"></a>required | `boolean` | Determines whether this parameter is mandatory. If the [parameter ___location](#parameterIn) is "path", this property is **REQUIRED** and its value MUST be `true`. Otherwise, the property MAY be included and its default value is `false`.
 <a name="parameterDeprecated"></a> deprecated | `boolean` | Specifies that a parameter is deprecated and SHOULD be transitioned out of usage.
 <a name="parameterAllowEmptyValue"></a> allowEmptyValue | `boolean` | Sets the ability to pass empty-valued parameters. This is valid only for `query` parameters and allows sending a parameter with an empty value. Default value is `false`. If [`style`](#parameterStyle) is used, and if behavior is `n/a` (cannot be serialized), the value of `allowEmptyValue` SHALL be ignored.
@@ -1224,7 +1224,7 @@ Describes a single request body.
 ##### Fixed Fields
 Field Name | Type | Description
 ---|:---:|---
-<a name="requestBodyDescription"></a>description | `string` | A brief description of the request body. This could contain examples of use.  [CommonMark syntax](http://spec.commonmark.org/) can be used for rich text representation.
+<a name="requestBodyDescription"></a>description | `string` | A brief description of the request body. This could contain examples of use.  [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation.
 <a name="requestBodyContent"></a>content | Map[`string`, [Media Type Object](#mediaTypeObject)] | **REQUIRED**. The content of the request body. The key is the media type and the value describes it.
 <a name="requestBodyRequired"></a>required | `boolean` | Determines if the request body is required in the request. Defaults to `false`.
 
@@ -1678,7 +1678,7 @@ Describes a single response from an API Operation, including design-time, static
 ##### Fixed Fields
 Field Name | Type | Description
 ---|:---:|---
-<a name="responseDescription"></a>description | `string` | **REQUIRED**. A short description of the response. [CommonMark syntax](http://spec.commonmark.org/) can be used for rich text representation.
+<a name="responseDescription"></a>description | `string` | **REQUIRED**. A short description of the response. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation.
 <a name="responseHeaders"></a>headers | Map[`string`, [Header Object](#headerObject)  \| [Reference Object](#referenceObject)] |  Maps a header name to its definition. [RFC7230](https://tools.ietf.org/html/rfc7230#page-22) states header names are case insensitive. If a response header is defined with the name `"Content-Type"`, it SHALL be ignored.
 <a name="responseContent"></a>content | Map[`string`, [Media Type Object](#mediaTypeObject)] | A map containing descriptions of potential response payloads. The key is the media type and the value is used to describe it.
 <a name="responseLinks"></a>links | Map[`string`, [Link Object](#linkObject) \| [Reference Object](#referenceObject)] | A map of operations links that can be followed from the response. The key of the map is a short name for the link, following the naming constraints of the names for [Component Objects](#componentsObject). 
@@ -1889,7 +1889,7 @@ myWebhook:
 Field Name | Type | Description
 ---|:---:|---
 <a name="exampleSummary"></a>summary | `string` | Short description for the example.
-<a name="exampleDescription"></a>description | `string` | Long description for the example. [CommonMark syntax](http://spec.commonmark.org/) can be used for rich text representation.
+<a name="exampleDescription"></a>description | `string` | Long description for the example. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation.
 <a name="exampleValue"></a>value | Any | Embedded literal example. The `value` field and `externalValue` field are mutually exclusive. To represent examples of media types that cannot naturally represented in JSON or YAML, use a string value to contain the example, escaping where necessary.
 <a name="exampleExternalValue"></a>externalValue | `string` | A URL that points to the literal example. This provides the capability to reference examples that cannot easily be included in JSON or YAML documents.  The `value` field and `externalValue` field are mutually exclusive. 
 
@@ -1978,7 +1978,7 @@ Field Name  |  Type  | Description
 <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.  Relative `operationRef` values MAY be used to locate an existing [Operation Object](#operationObject) in the OAS.
 <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, whereas the value can be a constant or an expression to be evaluated and passed to the linked operation.  The parameter name can be qualified using the [parameter ___location](#parameterIn) `[{in}.]{name}` for operations that use the same parameter name in different locations (e.g. path.id).
 <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.
-<a name="linkDescription"></a>description  | `string` | A description of the link. Supports [CommonMark syntax](http://spec.commonmark.org/).
+<a name="linkDescription"></a>description  | `string` | A description of the link. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation.
 <a name="linkServer"></a>server       | [Server Object](#serverObject) | A server object to be used by the target operation.
 
 This object can be extended with [Specification Extensions](#specificationExtensions). 
@@ -2160,7 +2160,7 @@ It is not mandatory to have a Tag Object per tag defined in the Operation Object
 Field Name | Type | Description
 ---|:---:|---
 <a name="tagName"></a>name | `string` | **REQUIRED**. The name of the tag.
-<a name="tagDescription"></a>description | `string` | A short description for the tag. [CommonMark syntax](http://spec.commonmark.org/) can be used for rich text representation.
+<a name="tagDescription"></a>description | `string` | A short description for the tag. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation.
 <a name="tagExternalDocs"></a>externalDocs | [External Documentation Object](#externalDocumentationObject) | Additional external documentation for this tag.
 
 This object can be extended with [Specification Extensions](#specificationExtensions). 
@@ -2325,7 +2325,7 @@ The following properties are taken from the JSON Schema definition but their def
 - items - Value MUST be an object and not an array. Inline or referenced schema MUST be of a [Schema Object](#schemaObject) and not a standard JSON Schema. `items` MUST be present if the `type` is `array`.
 - properties - Property definitions MUST be a [Schema Object](#schemaObject) and not a standard JSON Schema (inline or referenced).
 - additionalProperties - Value can be boolean or object. Inline or referenced schema MUST be of a [Schema Object](#schemaObject) and not a standard JSON Schema.
-- description - [CommonMark syntax](http://spec.commonmark.org/) can be used for rich text representation.
+- description - [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation.
 - format - See [Data Type Formats](#dataTypeFormat) for further details. While relying on JSON Schema's defined formats, the OAS offers a few additional predefined formats.
 - default - The default value represents what would be assumed by the consumer of the input as the value of the schema if one is not provided. Unlike JSON Schema, the value MUST conform to the defined type for the Schema Object defined at the same level. For example, if `type` is `string`, then `default` can be `"foo"` but cannot be `1`.
 
@@ -3191,7 +3191,7 @@ Supported schemes are HTTP authentication, an API key (either as a header or as
 Field Name | Type | Applies To | Description
 ---|:---:|---|---
 <a name="securitySchemeType"></a>type | `string` | Any | **REQUIRED**. The type of the security scheme. Valid values are `"apiKey"`, `"http"`, `"oauth2"`, `"openIdConnect"`.
-<a name="securitySchemeDescription"></a>description | `string` | Any | A short description for security scheme. [CommonMark syntax](http://spec.commonmark.org/) can be used for rich text representation.
+<a name="securitySchemeDescription"></a>description | `string` | Any | A short description for security scheme. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation.
 <a name="securitySchemeName"></a>name | `string` | `apiKey` | **REQUIRED**. The name of the header, query or cookie parameter to be used.
 <a name="securitySchemeIn"></a>in | `string` | `apiKey` | **REQUIRED**. The ___location of the API key. Valid values are `"query"`, `"header"` or `"cookie"`.
 <a name="securitySchemeScheme"></a>scheme | `string` | `http` | **REQUIRED**. The name of the HTTP Authorization scheme to be used in the [Authorization header as defined in RFC7235](https://tools.ietf.org/html/rfc7235#section-5.1).
