Yes, that’s stupid. GitHub.com/docbook/docbook 
<http://github.com/docbook/docbook> 

On Wed, 23 Feb 2022, at 18:25, Richard Hamilton wrote:
> Because of a fat-finger error, I just found that if you embed an indexterm 
> inside primary or secondary of an indexterm, the result is legal DocBook 
> according to the 5.0 through 5.2 schemas, including Schematron.
> 
> <indexterm>
>   <primary>
>     <indexterm><primary>term</primary></indexterm>
>   </primary>
> </indexterm>
> 
> Probably not a big deal in practice, except that it does lead to an error in 
> an epub when tested with epubcheck, and if the term inside the embedded 
> indexterm appears nowhere else, you get an error saying that there are no 
> entries for that index key.
> 
> If no one sees any reason for that to be valid, I can file an exception 
> (though I forget where, exactly, to do that:-).
> 
> Best regards,
> Dick Hamilton
> -------
> XML Press
> XML for Technical Communicators
> http://xmlpress.net
> [email protected]
> 
> 
> 
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