1 files changed, 1 insertions, 5 deletions
diff --git a/_intro.qmd b/_intro.qmd
index fdc8892..30f086c 100644
--- a/_intro.qmd
+++ b/_intro.qmd
@@ -123,11 +123,7 @@ to read Markdown with added markup for ontological annotations.
 First milestone is reached
 when the filter can simply suppress the added markup.
 A further milestone is to embed the expressed annotations
-in supported output formats,
-e.g. as XMP metadata in PDF output
-[@PDFAssociation2020 chapter 14.3]
-and as RDFa in html output
-[@Herman2015].
+in supported output formats.
 Another further milestone is to make use of the added markup,
 e.g. to annotate purpose of scholarly citations
 as presented in @Daquino2023.