Masterdb: read the target dbs from the usual doc directory

This is a coordinated change with the packages building DocBook/XML.
The target dbs are now installed alongside the generated documents.
Currently they are installed in $prefix/sgml/X11/dbs alongside masterdb which
has the potential of installing outside the package prefix and cause
distcheck to fail when user does not have write permission in this package.

The master db xi:include statement is changed. It uses a fully qualified
path but could also have used a relative path although it is difficult to
ensure it would work reliably. The generated html/pdf link are still relative.

The README elaborates on requirements which previously existed but were not
introduced by this patch.

Signed-off-by: Gaetan Nadon <memsize@videotron.ca>

1 files changed, 7 insertions, 0 deletions

diff --git a/README b/README
index 07e760b..e057938 100644
--- a/README
+++ b/README
@@ -64,6 +64,13 @@ configure option. For external references to work, it is assumed that
 the each package installs the documentation using the relative
 doc/${PACKAGE_TARNAME} location.
 
+It is also a requirement that all packages containing DocBook/XML documentation
+be installed under the same read-only architecture independent installation
+directory as evidenced by the DATAROOTDIR package value. This value should also
+be the same for the xorg-sgml-doctools package. The purpose of this requirement
+is to form a document tree of a known structure such that stylesheets,
+masterdb, target dbs and other files can be reached.
+
 The Docbook stylesheet technology will create references with paths relative
 to this location. It will navigate up to "doc" using ../ and then navigate
 down to the document it refers to.