The default read-only implementation of Article.
The default read-only implementation of Article. You typically should not need to directly reference this class; instead, use the Article.apply method to construct new instances.
This Proxy trait allows you to extend the Article trait with additional state or behavior and implement the read-only methods from Article using an underlying instance.
Field information in declaration order.
Checks that all required fields are non-null.
this stucture represents articles and its overrides