Value extends ParameterEdgesSource, ParameterValue, Wireable
Represents a single
typed value, accessible and modifiable
at runtime.
Values
have an associated name
and XSD type,
and may also have a defaultValue.
The defaultValue
of a Value
is serialised as a string
, and this string
instance is deserialised into a valid
type instance defined by that
Value. Each
Value has an associated containing scope
that represents the storage method for the
Value:
- If the Value is stored within an ActivityOperation or ActivityPredicate, then the containing scope of that value is the containing scope of the ActivityOperation's or ActivityPredicate's container.
- If the Value is stored within a Scope, then the value instance is unique to a given Scope. For example, a Value contained within a Session can only have one instance of that Value per Session instance, and instances of that Value cannot be accessed by other instances of the same Session scope.
- If the Value is not stored within a Scope, then the value instance is available globally according to the root InternetApplication. That is, only one instance of the Value can ever exist.
If a particular Value has a defined defaultValue, then the Value will initially be considered as unset. However, if a Value is subsequently updated -- for example, through the update BuiltinOperation -- the Value will now be considered set.
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