Reserved Names

The following names are reserved and can’t be used to define any other identifiers:

Int
Float
Boolean
String
DateTime
ID
uid
Subscription
as (case-insensitive)
Query
Mutation
Point
PointList
Polygon
MultiPolygon
Aggregate (as a suffix of any identifier name)

For each type, Dgraph generates a number of GraphQL types needed to operate the GraphQL API, these generated type names also can’t be present in the input schema. For example, for a type Author, Dgraph generates:

AuthorFilter
AuthorOrderable
AuthorOrder
AuthorRef
AddAuthorInput
UpdateAuthorInput
AuthorPatch
AddAuthorPayload
DeleteAuthorPayload
UpdateAuthorPayload
AuthorAggregateResult

Thus if Author is present in the input schema, all of those become reserved type names.