Brilliant, thanks Hans. Looks like I need to start delving properly into
the power of the XML setups.

Duncan

On Sun, 28 Jul 2019 at 21:04, Hans Hagen <j.hagen@xs4all.nl> wrote:

>
> \usemodule[mathml]
>
> \startxmlsetups mml:formula
>      \edef\mmlformulalabel{\xmlatt{#1}{label}}
>      \edef\mmlformulatitle{\xmlatt{#1}{title}}
>      \doifsomethingelse {\mmlformulalabel\mmlformulatitle} {
>
> \startplaceformula[reference=\mmlformulalabel,title=\mmlformulatitle]
>              \startformula
>                  \xmlfirst{#1}{/mml:math}
>              \stopformula
>          \stopplaceformula
>      } {
>          \startformula
>              \xmlfirst{#1}{/mml:math}
>          \stopformula
>      }
> \stopxmlsetups
>
> Duncan