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Variable Names [substvars-name]
===============================
Variable names may only consist of uppercase and lowercase Latin letters,
digits, and hyphens. Names must be at least one character long. (A regular
expression for this is `[A-Za-z0-9-]+`.)
Variable Substitutions [substvars-exp]
======================================
Variable substitutions are performed on certain binary control field values, as
explained in $[sectlink][fields-bin].
The format for variable substitutions is as follows:
${<var-name>}
`<var-name>` is the name of the variable.
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