Attribute
An attribute is a named entity with a type. It is used in conjunction with a AttributeContainer to provide a type safe container for attributes. This class isn't intended to store the value of an attribute, but only represent the identity of the attribute. It means that an attribute must be immutable and can potentially be pooled. Attributes can be created using the factory method.
Since
3.3
Parameters
<T>
the type of the named attribute