I started to tidy up the %-target handling in dmake45 and immediately stumbled
over tg_config.mk - line 103. Something like this:

bla{$(alllangiso)}$/$(PACKAGEDIR)$/%.properties :| blub$/%.xcs

This shouldn't work according to:

              <%-target> [<attributes>] <ruleop> [<%-prerequisites>] [;<recipe>]

       where %-target is a  target  containing  exactly  a  single  `%'  sign,
       attributes  is  a  list  (possibly  empty) of attributes, ruleop is the
       standard set of rule operators, %-prerequisites , if present, is a list
       of  prerequisites  containing  zero  or  more `%' signs, and recipe, if
       present, is the first line of the recipe.

and the :| operator definition doesn't help either.

But it works with the current 4.4 dmake (but only with the :| operator)
%.a %.b :| %.x ; recipe
is expanded to:
%.a : %.x ; recipe
%.b : %.x ; recipe

The :| still has problems with indirect prerequisites, see issue 48087, but
I think the "new" meaning of the :| operator should be:

Expand all targets / non-indirect prerequisite combinations and add the
indirect prerequisites to each target. Example:

%.a %.b :| %.x %.y 'Z' ; recipe
is expanded to:
%.a : %.x 'Z' ; recipe
%.b : %.x 'Z' ; recipe
%.a : %.y 'Z' ; recipe
%.b : %.y 'Z' ; recipe

This is nearly already the case with dmake 4.4 but the indirect prereq handling
is broken ATM.

Without the :| this fails currently and for consistency we should issue
an error if more than one %target is on one line without the :| operator.