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= Alternation Syntax
Alternation syntax similar to that used in Unix shells may also be
used:
`%{%{Foo}:-bar}`
This code returns the value of `%{Foo}`, if it has a value.
Otherwise, it returns a literal string bar.
`%{%{Foo}:-%{Bar}}`
This code returns the value of `%{Foo}`, if it has a value.
Otherwise, it returns the expansion of `%{Bar}`.
These conditional expansions can be nested to almost any depth, such
as with `%{%{One}:-%{%{Two}:-%{Three}}}`.
.Examples
`%{%{Stripped-User-Name}:-%{User-Name}}` +
`%{%{Framed-IP-Address}:-<none>}`
// Copyright (C) 2020 Network RADIUS SAS. Licenced under CC-by-NC 4.0.
// Development of this documentation was sponsored by Network RADIUS SAS.
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