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Add validation steps for schema extensions #454

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Jun 11, 2018
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Add validation steps for schema extensions #454

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7 changes: 7 additions & 0 deletions spec/Section 3 -- Type System.md
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Expand Up @@ -160,6 +160,13 @@ Schema extensions are used to represent a schema which has been extended from
an original schema. For example, this might be used by a GraphQL service which
adds additional operation types, or additional directives to an existing schema.

**Schema Validation**

Schema extensions have the potential to be invalid if incorrectly defined.

1. The Schema must already be defined.
2. Any directives provided must not already apply to the original Schema.


## Descriptions

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