+# ../txt/usermanual_en.txt: usermanual_en.sgml
+ sgml2txt -f usermanual_en.sgml
+
+# ../html/spiderCVS_en.html: spiderCVS_en.sgml
+ sgml2html spiderCVS_en.sgml
+
+# ../txt/spiderCVS_en.txt: spiderCVS_en.sgml
+ sgml2txt -f spiderCVS_en.sgml
+
+# ../html/filtering_en.html: filtering_en.sgml
+ sgml2html filtering_en.sgml
+
+# ../txt/filtering_en.txt: filtering_en.sgml
+ sgml2txt -f filtering_en.sgml