$(if $(filter %.html,$(2)),| sed 's/ xmlns:[0-9A-Za-z_-]*="[^"]*"//g',)\
| grep -v '^<!DOCTYPE \([^h]\|.[^t]\|..[^m]\|...[^l]\|....[^ >]\)'\
> $(2)
all: $(content) $(resources) $(feeds);
$(if $(filter %.html,$(2)),| sed 's/ xmlns:[0-9A-Za-z_-]*="[^"]*"//g',)\
| grep -v '^<!DOCTYPE \([^h]\|.[^t]\|..[^m]\|...[^l]\|....[^ >]\)'\
> $(2)
all: $(content) $(resources) $(feeds);