Containers

TypeDeclaration,
example		Description
ListList<Type>,
List<Int32>		A variable-length sequence consisting of same-type elements.
DictionaryDict<KeyType, ValueType>,
Dict<String,Int32>		Set of key-value pairs with a fixed type of keys and values.
SetSet<KeyType>,
Set<String>		A set of elements with a fixed type is a special case of a dictionary with the Void value type.
TupleTuple<Type1, …, TypeN>,
Tuple<Int32,Double>		Set of unnamed fixed-length elements with types specified for all elements.
StructureStruct<Name1:Type1, …, NameN:TypeN>,
Struct<Name:String,Age:Int32>		A set of named fields with specified value types, fixed at query start (must be data-independent).
StreamStream<Type>,
Stream<Int32>		Single-pass iterator by same-type values, not serializable
Variant on tupleVariant<Type1, Type2>,
Variant<Int32,String>		A tuple known to have exactly one element filled
Variant on structureVariant<Name1:Type1, Name2:Type2>,
Variant<value:Int32,error:String>		A structure known to have exactly one element filled
EnumerationEnum<Name1, Name2>,
Enum<value,error>		A container with exactly one enumeration element selected and defined only by its name.

If needed, you can nest containers into each other in arbitrary combinations, for example: List<TupleInt32,Int32>.

In certain contexts, optional values can also be considered a container type (Optional<Type>) that behaves as a list of length 0 or 1.

To create literals of list containers, dictionary containers, set containers, tuple containers, or structure containers, you can use the operator notation.
To create a variant literal over a tuple or structure, use the function Variant.
To create an enumeration literal, use the function Enum.

To access container elements, use a dot or square brackets, depending on the container type.