Release 0.9.0.0

src/Language/GraphQL/Validate/Rules.hs

@@ -2,6 +2,7 @@
    v. 2.0. If a copy of the MPL was not distributed with this file, You can
    obtain one at https://mozilla.org/MPL/2.0/. -}
 
+-- | This module contains default rules defined in the GraphQL specification.
 module Language.GraphQL.Validate.Rules
     ( Rule(..)
     , executableDefinitionsRule
@@ -10,14 +11,19 @@ module Language.GraphQL.Validate.Rules
 
 import Language.GraphQL.AST.Document
 
+-- | 'Rule' assigns a function to each AST node that can be validated. If the
+-- validation fails, the function should return an error message, or 'Nothing'
+-- otherwise.
 newtype Rule
     = DefinitionRule (Definition -> Maybe String)
 
+-- | Default reules given in the specification.
 specifiedRules :: [Rule]
 specifiedRules =
     [ executableDefinitionsRule
     ]
 
+-- | Definition must be OperationDefinition or FragmentDefinition.
 executableDefinitionsRule :: Rule
 executableDefinitionsRule = DefinitionRule go
   where