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indexterm: primary is optional?

From: Brian Lalonde <brianiacus at yahoo dot com>
To: docbook at lists dot oasis-open dot org
Date: Tue, 12 Feb 2002 14:22:47 -0800
Subject: DOCBOOK: indexterm: primary is optional?

I notice that the indexterm element is defined as:

indexterm ::=
(primary?,
 ((secondary,
   ((tertiary,
     (see|seealso+)?)|
    see|seealso+)?)|
  see|seealso+)?)

Why is primary optional?

TIA

Follow-Ups:
- Re: indexterm: primary is optional?
  - From: Michael Smith

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