New initializes an instance of Schema.

http://facebook.github.io/graphql/draft/#sec-Type-System.Directives.

Enum types describe a set of possible values.

EnumValue types are unique values that may be serialized as a string: the name of the represented value.

Field is a conceptual function which yields values.

InputObject types define a set of input fields; the input fields are either scalars, enums, or other input objects.

http://facebook.github.io/graphql/draft/#InputValueDefinition.

Interface types represent a list of named fields and their arguments.

Object types represent a list of named fields, each of which yield a value of a specific type.

Scalar types represent primitive leaf values (e.g.

Schema represents a GraphQL service's collective type system capabilities.

Union types represent objects that could be one of a list of GraphQL object types, but provides no guaranteed fields between those types.

NamedType represents a type with a name.

FieldsList is a list of an Object's Fields.