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= &Attribute References
.Syntax
[source,unlang]
----
[&]Attribute-Name
----
The `&Attribute-Name` operator returns a reference to the named
attribute.
When used as an existence check in a condition, the condition
evaluates to `true` if the attribute exists. Otherwise, the condition
evaluates to `false`.
When used elsewhere, such as in xref:switch.adoc[switch], it returns
the value of the named attribute.
.Examples
[source,unlang]
----
&User-Name
&NAS-IP-Address
----
== Lists
The attribute reference can also be qualified with a
xref:list.adoc[list] reference. When no list is given, the server
looks in the input packet list for the named attribute.
.Examples
[source,unlang]
----
&request:User-Name
&reply:NAS-IP-Address
----
== Array References
.Syntax
[source,unlang]
----
&Attribute-Name[<integer>]
----
When an attribute appears multiple times in a list, this syntax allows
you to address the attributes as if they were array entries. The
`<integer>` value defines which attribute to address. The `[0]` value
refers to the first attributes, `[1]` refers to the second attribute,
etc.
.Examples
[source,unlang]
----
&EAP-Message[1]
&reply:NAS-IP-Address[2]
----
== Removing ambuguity from the configuration files
The server does not use the `&` character to distinguish attribute names
from other strings.
Without the `&`, it is more difficult to parse the configuration file
clearly. You could interpret a string as `hello-there`
either as a literal string "hello-there", or as a reference to an
attribute named `hello-there`.
Adding the leading `&` character means that attribute references are
now easily distinguishable from literal strings. The use of the leading
`&` character is highly recommended.
// 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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