[gtk-doc] design: add more details for the xml transition

[Stefan Sauer <stefkost src gnome org>]

commit 5e6c8034adacdf08da4f46770a9000e79b182841
Author: Stefan Sauer <ensonic users sf net>
Date:   Wed Nov 1 20:56:06 2017 +0100

    design: add more details for the xml transition

 doc/design-2.x.txt |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)
---
diff --git a/doc/design-2.x.txt b/doc/design-2.x.txt
index fbbd46c..6eb5fb8 100644
--- a/doc/design-2.x.txt
+++ b/doc/design-2.x.txt
@@ -94,3 +94,13 @@ We can enable such a toolchain via the configure flavors option.
 TODO:
 - markdown does not define a way to aggregate fragments into a large book
   - we can only concat all the files in a stable order
+
+As a first step we need to make sure we only render the html files with docbook.
+Right now we also produce the devhelp files using xslt (see devhelp2.xsl). We
+should be able to produce the devhelp files from gtkdoc-mkdb directly. We can
+generate this file outside of the html dir (and adjust the make install target).
+The tricky part is that we might need to scan the static content files to be
+able to generate the same toc.
+A nice extra benefit would be that this should already make things faster.
+
+