[NTG-context] Defining hyphenation sites that will not produce a dash?

[Johannes Graumann]

Hello

My ConTeXted XML document contains a number of constructs like this

pRS&thinspace;403&endash;<math><mn>9</mn><mo>&times;</mo></math>Myc/TEV/<i>URA3</i>/TEV/His<sub>8</sub>

(molecular genetical plasmid/genotype deinitions - in case you wonder ;0).

This predictably produces line break/hyphenation trouble. I'm already using
a mapping rule like this

\defineXMLargument  [hyph]    {\-}

but I was wondering whether there's an analogue that won't produce a
hypneation-dash if the manually defined hyphenation site is used.

Thanks for any hint,

Joh