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Editorial: Clarify meta-fields in introspection #844

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Apr 9, 2021
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Editorial: Clarify meta-fields in introspection #844

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Editorial: Clarify meta-fields in introspection
leebyron Apr 8, 2021
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Update spec/Section 4 -- Introspection.md
leebyron Apr 9, 2021
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Update spec/Section 4 -- Introspection.md
leebyron Apr 9, 2021
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Update spec/Section 4 -- Introspection.md
leebyron Apr 9, 2021
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17 changes: 10 additions & 7 deletions spec/Section 4 -- Introspection.md
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Expand Up @@ -89,14 +89,17 @@ warnings.

## Type Name Introspection

GraphQL supports type name introspection at any point within a query by the
meta-field `__typename: String!` when querying against any Object, Interface,
or Union. It returns the name of the object type currently being queried.
GraphQL supports type name introspection within any selection set in an
operation, with the single exception of selections at the root of a subscription
operation. Type name introspection is accomplished via the meta-field
`__typename: String!` on any Object, Interface, or Union. It returns the name of
the concrete Object type at that point during execution.

This is most often used when querying against Interface or Union types to
identify which actual type of the possible types has been returned.
identify which actual Object type of the possible types has been returned.

This field is implicit and does not appear in the fields list in any defined type.
As a meta-field, `__typename` is implicit and does not appear in the fields list
in any defined type.


## Schema Introspection
Expand All @@ -110,8 +113,8 @@ __schema: __Schema!
__type(name: String!): __Type
```

These fields are implicit and do not appear in the fields list in the root type
of the query operation.
Like all meta-fields, these are implicit and do not appear in the fields list in
the root type of the query operation.

The schema of the GraphQL schema introspection system:

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