some debugging features

api/Makefile

@@ -3,10 +3,13 @@ all: basic_api.h
 %.xml: %.yml2
 	yml2proc -P $< -o $@
 
+%.xsl: %.ysl2
+	yml2proc -DP $< -o $@
+
 %.h: %.yml2 pEp.yml2 gen_c_header.ysl2 to_c.ysl2
 	yml2proc -y gen_c_header.ysl2 pEp.yml2
 
 .PHONY: clean
 
 clean:
-	rm -f *.xml *.h
+	rm -f *.xml *.xsl *.h