1 files changed, 1 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index 7089f8b..a075a3b 100644
--- a/Makefile
+++ b/Makefile
@@ -58,6 +58,7 @@ learn/$(ONTOLOGIES_VERSION)/%.ttl: learn/%.ttl
 	 -e 's,\Q$(BASE_URI)stub/doap#,http://usefulinc.com/ns/doap#,g;' \
 	 -e 's,purl\.org/learn/\K(?=[^\d]),$(ONTOLOGIES_VERSION)/,g;' \
 	 -e 's/\n\h+owl:imports <[^>]+> ;//g;' \
+	 -e 's/(?:\G|^)\s{4}/\t/gm;' \
 	 < $< > $@
 
 learn/%_sdm.qmd: learn/$(ONTOLOGIES_VERSION)/%.ttl