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Databases - Practical PostgreSQL
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Object Variable Value Substitution

The substitution of a variable value from an object is very similar to normal variable substitution. However, instead of using the dollar sign ($) to substitute a value, you use the at sign (@). Syntactically, the only difference between referencing a variable value with @ instead of $ is that dots (.) and square brackets ([]) are allowed as part of the object name.

A literal at sign (@) can be placed inside of an attribute's value by typing the character twice consecutively (e.g., <setvar email="" />).

Databases - Practical PostgreSQL
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