diff --git a/Makefile b/Makefile
index 9fd33d3f9..317e97797 100644
--- a/Makefile
+++ b/Makefile
@@ -105,34 +105,27 @@ $(DATESTAMP):
build/%.html : NOVALID:=true
build/news.html: $(WWW_CCC_DE_UPDATES) $(CALENDAR_SUMMARY) $(DATESTAMP)
build/news-rss.xml : STYLE=xsl/rss.xsl
-build/news-rss.xml : NOVALID:=true
build/news-rss.xml : PFLAGS+=--stringparam prefix ""
build/news-rss.xml : VFLAGS_OUT=$(VFLAGS) --schema xsd/rss20.xsd
build/news-atom.xml : STYLE=xsl/atom.xsl
-build/news-atom.xml : NOVALID:=true
build/news-atom.xml : PFLAGS+=--stringparam prefix ""
build/news-atom.xml : VFLAGS_OUT=$(VFLAGS) --relaxng xsd/atom.rng
build/podcast.xml : STYLE=xsl/podcast.xsl
-build/podcast.xml : NOVALID:=true
build/podcast.xml : VFLAGS_OUT=$(VFLAGS) --schema xsd/rss20.xsd
build/podcast.xml: xsl/podcast.xsl # Does not work with $(STYLE) - why?
build/pentaradio.xml : STYLE=xsl/podcast.xsl
-build/pentaradio.xml : NOVALID:=true
build/pentaradio.xml : VFLAGS_OUT=$(VFLAGS) --schema xsd/rss20.xsd
build/pentaradio.xml : PFLAGS+=--stringparam selection pentaradio
build/pentaradio.xml: xsl/podcast.xsl # Does not work with $(STYLE) - why?
build/pentacast.xml : STYLE=xsl/podcast.xsl
-build/pentacast.xml : NOVALID:=true
build/pentacast.xml : VFLAGS_OUT=$(VFLAGS) --schema xsd/rss20.xsd
build/pentacast.xml : PFLAGS+=--stringparam selection pentacast
build/pentacast.xml: xsl/podcast.xsl # Does not work with $(STYLE) - why?
build/pentamusic.xml : STYLE=xsl/podcast.xsl
-build/pentamusic.xml : NOVALID:=true
build/pentamusic.xml : VFLAGS_OUT=$(VFLAGS) --schema xsd/rss20.xsd
build/pentamusic.xml : PFLAGS+=--stringparam selection pentamusic
build/pentamusic.xml: xsl/podcast.xsl # Does not work with $(STYLE) - why?
build/pentamedia.xml : STYLE=xsl/podcast.xsl
-build/pentamedia.xml : NOVALID:=true
build/pentamedia.xml : VFLAGS_OUT=$(VFLAGS) --schema xsd/rss20.xsd
build/pentamedia.xml : PFLAGS+=--stringparam selection pentamedia
build/pentamedia.xml: xsl/podcast.xsl # Does not work with $(STYLE) - why?
diff --git a/xsd/rss20.xsd b/xsd/rss20.xsd
index b578c749d..0ddf80957 100644
--- a/xsd/rss20.xsd
+++ b/xsd/rss20.xsd
@@ -55,7 +55,7 @@