[plt-scheme] identifier delimiter for @something expressions in web templates

Hi,

Is there a identifier delimiter for @something expressions in web templates?

If my template has the form;
; <tspan  x="100"  dy="0"  id="ts1" font-family="sans-serif"
font-size="70%" >@from</tspan>

then I get a binding 'from</tspan>' rather than the expected from
; templates/svg/events-email-row.svg:4:76: expand: unbound identifier
in module in: from</tspan>

I can put a space in,  [@from </tspan>], but this pollutes my output
with extra spaces after each identifier.

Thanks,

Stephen


PS Does this count as a 'gotcha' for the template documentation?