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+README for the 'browser/stylesheets/' directory
+===============================================
+
+This folder is a Zope 3 Resource Directory acting as a repository for
+stylesheets.
+
+Its declaration is located in 'browser/configure.zcml':
+
+    <!-- Resource directory for stylesheets -->
+    <browser:resourceDirectory
+        name="koehsel.theme.stylesheets"
+        directory="stylesheets"
+        layer=".interfaces.IThemeSpecific"
+        />
+
+A stylesheet placed in this directory (e.g. 'main.css') can be accessed from
+this relative URL:
+
+    "++resource++koehsel.theme.stylesheets/main.css"
+
+Note that it might be better to register each of these resources separately if
+you want them to be overridable from zcml directives.
+
+The only way to override a resource in a resource directory is to override the
+entire directory (all elements have to be copied over).
+
+A Zope 3 browser resource declared like this in 'browser/configure.zcml':
+
+    <browser:resource
+        name="main.css"
+        file="stylesheets/main.css"
+        layer=".interfaces.IThemeSpecific"
+        />
+
+can be accessed from this relative URL:
+
+    "++resource++main.css"
+
+Notes
+-----
+
+* Stylesheets registered as Zope 3 resources might be flagged as not found in
+  the 'portal_css' tool if the layer they are registered for doesn't match the
+  default skin set in 'portal_skins'.
+  This can be confusing but it must be considered as a minor bug in the CSS
+  registry instead of a lack in the way Zope 3 resources are handled in
+  Zope 2.
+
+* There might be a way to interpret DTML from a Zope 3 resource view.
+  Although, if you need to use DTML for setting values in a stylesheet (the
+  same way as in default Plone stylesheets where values are read from
+  'base_properties'), it is much easier to store it in a directory that is
+  located in the 'skins/' folder of your package, registered as a File System
+  Directory View in the 'portal_skins' tool, and added to the layers of your
+  skin.
+
+* Customizing/overriding stylesheets that are originally accessed from the
+  'portal_skins' tool (e.g. Plone default stylesheets) can be done inside that
+  tool only. There is no known way to do it with Zope 3 browser resources.
+  Vice versa, there is no known way to override a Zope 3 browser resource from
+  a skin layer in 'portal_skins'.