Make target `clean'

Makefile

@@ -11,6 +11,12 @@ SAXON = java -jar lib/saxon9he.jar
 %.sch: %.rng
 	$(SAXON) -xsl:lib/rngsch.xsl -o:$@ $<
 
+.PHONY: clean
+clean:
+	rm -f src/*.xsd
+	rm -f src/*.rng
+	rm -f src/*.sch
+
 test: src/ruleset.sch
 	$(XSPEC) -s test/ruleset.xspec