Fix URI for DocBook schema

diff --git a/xsl/slides/schema/relaxng/slides.rnc b/xsl/slides/schema/relaxng/slides.rnc
index bd697367bab0f1b0608516a24199a5be457ee058..062ed05479274f78be23276708b7839b8d6e8622 100644 (file)
--- a/xsl/slides/schema/relaxng/slides.rnc
+++ b/xsl/slides/schema/relaxng/slides.rnc
@@ -28,7 +28,7 @@ default namespace dbs = "http://docbook.org/ns/docbook-slides"
 # 
 # ======================================================================
 
-include "http://docbook.org/xml/5.0/rng/docbook.rnc" inherit = db {
+include "https://docbook.org/xml/5.0/rng/docbook.rnc" inherit = db {
   start = dbs.slides
   
   # Avoid ID clashes