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@@ -448,6 +448,60 @@ fragment missingRequiredArg on Arguments {
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### Fragment Declarations
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#### Fragment Name Uniqueness
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** Formal Specification **
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* For each fragment definition {fragment} in the document
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* Let {fragmentName} be the name of {fragment}.
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* Let {fragments} be all fragment definitions in the document named {fragmentName}.
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* {fragments} must be a set of one.
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** Explanatory Text **
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Fragment definitions are referenced in fragment spreads by name. To avoid
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ambiguity, each fragment's name must be unique within a document.
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Inline fragments are not considered fragment definitions, and unaffected by this
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validation rule.
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For example the following document is valid:
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```graphql
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{
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...fragmentOne
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...fragmentTwo
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}
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fragment fragmentOne on Dog {
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name
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}
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fragment fragmentTwo on Dog {
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owner {
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name
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}
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}
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```
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While this document is invalid:
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```graphql
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{
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...fragmentOne
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}
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fragment fragmentOne on Dog {
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name
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}
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fragment fragmentOne on Dog {
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owner {
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name
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}
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}
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```
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#### Fragment Spread Type Existence
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** Formal Specification **
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