Node expressions are used to specify nodes within production statements. Every non-void expression is considered as a node expression. The two most common cases are:

1. Node creation, from either the constructor or method
2. Local variables created in either the production, or passed by the query

The syntax for calling the creator of an object is simplified in a production statement. Indeed, the keyword new and empty pairs of parentheses can be omitted.

In the following production statement, two new nodes are created from their constructor (which in java would be new Node()).

 ==> Node Node;