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2 changes: 2 additions & 0 deletions spec/Section 4 -- Introspection.md
Original file line number Diff line number Diff line change
Expand Up @@ -98,6 +98,8 @@ identify which actual type of the possible types has been returned.

This field is implicit and does not appear in the fields list in any defined type.

Note: `__typename` may not be included as a root field in a subscription
operation.

## Schema Introspection

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10 changes: 4 additions & 6 deletions spec/Section 5 -- Validation.md
Original file line number Diff line number Diff line change
Expand Up @@ -249,7 +249,8 @@ query getName {
* Let {variableValues} be the empty set.
* Let {groupedFieldSet} be the result of
{CollectFields(subscriptionType, selectionSet, variableValues)}.
* {groupedFieldSet} must have exactly one entry.
* {groupedFieldSet} must have exactly one entry, which must not be an
introspection field.

**Explanatory Text**

Expand Down Expand Up @@ -305,14 +306,11 @@ fragment multipleSubscriptions on Subscription {
}
```

Introspection fields are counted. The following example is also invalid:
The root field of a subscription operation must not be an introspection field.
The following example is also invalid:

```graphql counter-example
subscription sub {
newMessage {
body
sender
}
__typename
}
```
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