+check-urls:
+ retval=0; for u in $$(perl -n -e'/<ulink url="(.+)"\/>/ && print "$$1\n"' MadewithCreativeCommonsmostup-to-dateversion.xml | sort -u); do \
+ HEAD -H "User-Agent: Docbook XML URL checker" "$$u" > /dev/null || echo "error fetching $$u"; retval=1; \
+ done; exit $$retval
+
+# Experimental build rule to test Docbook XSL + FOP processor
+xsl-fo-%.pdf: %.xml
+ xsltproc --output $(subst .pdf,.fo,$@) \
+ extra/stylesheet-fo.xsl $^; \
+ fop -fo $(subst .pdf,.fo,$@) -pdf $@
+