How to quote "${abc}" so it will pass through without evaluation?

["Karr, David" <david.karr@xxxxxxxx>]

I'm trying to write an xsl to transform an Ant script, adding a couple
targets with tasks that reference patterns like "${abc}" in attribute
values.  I can't figure out how to specify "${abc}" in attribute values
in my template so it will just generate "${abc}" and will not try to
evaluate it.