Editorial: Define _response map_

This creates a definition for Response Map, defined as the map normally returned by graphql queries and mutations containing data and/or errors.

The definition of Response is updated to include both Response Map, and Response Stream (for subscriptions).

For Incremental Delivery I plan on updating Response to also include _Incremental Stream_.

Address feedback

Update spec/Section 7 -- Response.md

Co-authored-by: Benjie <[email protected]>

Author: robrichard

spec/Section 6 -- Execution.md

@@ -301,13 +301,13 @@ MapSourceToResponseEvent(sourceStream, subscription, schema, variableValues):
 
 - Let {responseStream} be a new _event stream_.
 - When {sourceStream} emits {sourceValue}:
-  - Let {response} be the result of running
+  - Let {responseMap} be the result of running
     {ExecuteSubscriptionEvent(subscription, schema, variableValues,
     sourceValue)}.
   - If internal {error} was raised:
     - Cancel {sourceStream}.
     - Complete {responseStream} with {error}.
-  - Otherwise emit {response} on {responseStream}.
+  - Otherwise emit {responseMap} on {responseStream}.
 - When {sourceStream} completes normally:
   - Complete {responseStream} normally.
 - When {sourceStream} completes with {error}:
@@ -804,22 +804,22 @@ A _field error_ is an error raised from a particular field during value
 resolution or coercion. While these errors should be reported in the response,
 they are "handled" by producing a partial response.
 
-Note: This is distinct from a _request error_ which results in a response with
-no data.
+Note: This is distinct from a _request error_ which results in a _response map_
+with no {"data"}.
 
 If a field error is raised while resolving a field, it is handled as though the
 field returned {null}, and the error must be added to the {"errors"} list in the
-response.
+_response map_.
 
 If the result of resolving a field is {null} (either because the function to
 resolve the field returned {null} or because a field error was raised), and that
 field is of a `Non-Null` type, then a field error is raised. The error must be
-added to the {"errors"} list in the response.
+added to the {"errors"} list in the _response map_.
 
 If the field returns {null} because of a field error which has already been
-added to the {"errors"} list in the response, the {"errors"} list must not be
-further affected. That is, only one error should be added to the errors list per
-field.
+added to the {"errors"} list in the _response map_, the {"errors"} list must not
+be further affected. That is, only one error should be added to the errors list
+per field.
 
 Since `Non-Null` type fields cannot be {null}, field errors are propagated to be
 handled by the parent field. If the parent field may be {null} then it resolves
@@ -832,5 +832,5 @@ type is also wrapped in a `Non-Null`, the field error continues to propagate
 upwards.
 
 If all fields from the root of the request to the source of the field error
-return `Non-Null` types, then the {"data"} entry in the response should be
+return `Non-Null` types, then the {"data"} entry in the _response map_ should be
 {null}.

spec/Section 7 -- Response.md

@@ -10,71 +10,74 @@ the case that any _field error_ was raised on a field and was replaced with
 
 ## Response Format
 
-A GraphQL request returns either a _response_ or a _response stream_.
+:: A GraphQL _response_ is either a _response map_ or a _response stream_.
 
-### Response
+### Response Map
 
-:: A GraphQL request returns a _response_ when the GraphQL operation is a query
-or mutation. A _response_ must be a map.
+:: A GraphQL request returns a _response map_ when the GraphQL operation is a
+query or mutation. When the GraphQL operation is a subscription, the GraphQL
+request returns a _response map_ if a _request error_ is raised. A response map
+must be a map.
 
-If the request raised any errors, the response map must contain an entry with
+If the request raised any errors, the _response map_ must contain an entry with
 key `errors`. The value of this entry is described in the "Errors" section. If
 the request completed without raising any errors, this entry must not be
 present.
 
-If the request included execution, the response map must contain an entry with
+If the request included execution, the _response map_ must contain an entry with
 key `data`. The value of this entry is described in the "Data" section. If the
 request failed before execution, due to a syntax error, missing information, or
 validation error, this entry must not be present.
 
-The response map may also contain an entry with key `extensions`. This entry, if
-set, must have a map as its value. This entry is reserved for implementers to
+The _response map_ may also contain an entry with key `extensions`. This entry,
+if set, must have a map as its value. This entry is reserved for implementers to
 extend the protocol however they see fit, and hence there are no additional
 restrictions on its contents.
 
 To ensure future changes to the protocol do not break existing services and
-clients, the top level response map must not contain any entries other than the
-three described above.
+clients, the top level _response map_ must not contain any entries other than
+the three described above.
 
-Note: When `errors` is present in the response, it may be helpful for it to
-appear first when serialized to make it more clear when errors are present in a
-response during debugging.
+Note: When `errors` is present in the _response map_, it may be helpful for it
+to appear first when serialized to make it more clear when errors are present in
+a response map during debugging.
 
 ### Response Stream
 
 :: A GraphQL request returns a _response stream_ when the GraphQL operation is a
-subscription. A _response stream_ must be a stream of _response_.
+subscription and a _request error_ is not raised. A response stream must be a
+stream of _response map_.
 
 ### Data
 
-The `data` entry in the response will be the result of the execution of the
-requested operation. If the operation was a query, this output will be an object
-of the query root operation type; if the operation was a mutation, this output
-will be an object of the mutation root operation type.
+The `data` entry in the _response map_ will be the result of the execution of
+the requested operation. If the operation was a query, this output will be an
+object of the query root operation type; if the operation was a mutation, this
+output will be an object of the mutation root operation type.
 
 If an error was raised before execution begins, the `data` entry should not be
-present in the response.
+present in the _response map_.
 
-If an error was raised during the execution that prevented a valid response, the
-`data` entry in the response should be `null`.
+If an error was raised during execution that propagated to the operation root,
+the `data` entry in the _response map_ should be `null`.
 
 ### Errors
 
-The `errors` entry in the response is a non-empty list of errors raised during
-the _request_, where each error is a map of data described by the error result
-format below.
+The `errors` entry in the _response map_ is a non-empty list of errors raised
+during the _request_, where each error is a map of data described by the error
+result format below.
 
-If present, the `errors` entry in the response must contain at least one error.
-If no errors were raised during the request, the `errors` entry must not be
-present in the response.
+If present, the `errors` entry in the _response map_ must contain at least one
+error. If no errors were raised during the request, the `errors` entry must not
+be present in the response map.
 
-If the `data` entry in the response is not present, the `errors` entry must be
-present. It must contain at least one _request error_ indicating why no data was
-able to be returned.
+If the `data` entry in the _response map_ is not present, the `errors` entry
+must be present. It must contain at least one _request error_ indicating why no
+data was able to be returned.
 
-If the `data` entry in the response is present (including if it is the value
-{null}), the `errors` entry must be present if and only if one or more _field
-error_ was raised during execution.
+If the `data` entry in the _response map_ is present (including if it is the
+value {null}), the `errors` entry must be present if and only if one or more
+_field error_ was raised during execution.
 
 **Request Errors**
 
@@ -85,7 +88,7 @@ to determine which operation to execute, or invalid input values for variables.
 
 A request error is typically the fault of the requesting client.
 
-If a request error is raised, the `data` entry in the response must not be
+If a request error is raised, the `data` entry in the _response map_ must not be
 present, the `errors` entry must include the error, and request execution should
 be halted.
 
@@ -99,8 +102,8 @@ A field error is typically the fault of a GraphQL service.
 
 If a field error is raised, execution attempts to continue and a partial result
 is produced (see [Handling Field Errors](#sec-Handling-Field-Errors)). The
-`data` entry in the response must be present. The `errors` entry should include
-this error.
+`data` entry in the _response map_ must be present. The `errors` entry should
+include this error.
 
 **Error Result Format**