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A schema with all deprecated elements removed must itself be valid #1231

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4 changes: 3 additions & 1 deletion spec/Section 3 -- Type System.md
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Expand Up @@ -136,6 +136,9 @@ All types and directives defined within a schema must not have a name which
begins with {"\_\_"} (two underscores), as this is used exclusively by GraphQL's
introspection system.

If a GraphQL schema contains any deprecated _schema element_, a copy of the
schema that omits all deprecated _schema element_ must itself be valid.
Comment on lines +139 to +140

@mjmahone mjmahone Jul 2, 2026

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Maybe: "A copy of a GraphQL schema that omits every deprecated schema element must itself be valid."

A schema with no deprecated elements will be trivially valid. Also making sure _schema element_ is pluralized correctly.


### Root Operation Types

:: A schema defines the initial _root operation type_ for each kind of operation
Expand Down Expand Up @@ -968,7 +971,6 @@ IsValidImplementation(type, implementedType):
2. Let {implementedFieldType} be the return type of {implementedField}.
3. {IsValidImplementationFieldType(fieldType, implementedFieldType)} must
be {true}.
6. If {field} is deprecated then {implementedField} must also be deprecated.

@leebyron leebyron Jul 2, 2026

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imho we should leave this in place though as an implementation of the new definition you've added above?

I don't think the spec should leave various ways in which the subset-is-valid needs to be looked out for

separately, I think removing this actually says something else-- that an interface field being deprecated may differ from the deprecation status of an implemented field? -- that could be a separate proposal if that's what we want to explore


IsValidImplementationFieldType(fieldType, implementedFieldType):

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