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Databases - Practical PostgreSQL
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Tag Parsing

When a tag is parsed, its attributes are read in one of two ways—literally, or interpretively. Similar to existing conventions in a variety of languages, defining a value in single-quotes (e.g., name='value') causes the contents of the value to be parsed literally, regardless of the characters between quotes. Using double-quotes causes its contents to be parsed interpretively, meaning that some characters will be treated in special ways.

Specifically, these special characters are the dollar sign ($), the at sign (@), and the ampersand (&). These characters correspond to variable substitution, object variable value substitution, and entity substitution, respectively.

Value substitution is the process by which a variable, cookie, object, or entity's value is substituted for its syntactically referenced name . This occurs at the name's original location in any arbitrary string of characters.

Databases - Practical PostgreSQL
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