====== Variables ======

Query variables are variables declared in a query. They are either explicitly (in a declaration) or implicitly declared. To be used manually, the variable need to be given an identifier. Indeed, all node pattern declare a query variable, used in the pattern matching, but only the one with an identifier are accessible manually.

The query variables are available in both the scope of the query where they are declared, and in the the scope of the statement this query belongs. In the case of rule statement, the variables are available in the production. In the case of an query expression, the variables are available in the rest of the statement.

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