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If false, and the parameter is bound, then the value for the parameter must not be null. The default is
true, to allow nulls. This is different than required, in that the parameter may be bound, but bound to a null
If true (the default), then the value for the parameter is cached while the component is, itself, rendering.
Values from invariant bindings (such as literal strings) are always cached, regardless of this setting. Set this
attribute to false to force the parameter to be re-read every
time the field is accessed, even while the component is rendering.
The default value for the parameter if not bound. This is a binding expression,
typically the name of a property of the component to bind. The default value for this attribute
is the empty string, indicating that there is no default default binding.
The default binding prefix for the parameter, if no specific binding prefix is provided with the binding. There
is rarely a reason to override this. Typically, non-standard default binding prefixes are paired with
specific BindingFactory implementations, and used with parameters whose
name reflects the binding prefix.
Used to mark a parameter as requiring earlier initialization than other parameters. This is used when default
bindings for secondary parameters rely on a principal parameter, which itself may have a default value. This
ensures that the binding for the principal parameter(s) are initialized, possibly involving a defaulter method,
before the secondary parameters are initialized (as they may need to know if the principal parameter is bound,
and what type of value it is bound to). This is rarely used, and it is highly unlikely a single component would
have more than a single principal parameter.
Used to create a default binding, connecting the parameter to a property of the container whose property name
matches the id of the component. This is frequently used for form element components. This default binding is
only used if there is no matching container property.