Objects join: dot notation

Dot notation has two features: (1) define an object join relationship; and (2) access to a pre-defined member data in the object.

In the following examples, 1 defines an object join relation between item and category; and 2 defines the primary key data in the item object:
  1. item.category
  2. item.pk

For more information, see Semantics of an object join.