From 24f726d50d1320c3e04d335b45ee2345add76b9f Mon Sep 17 00:00:00 2001
From: hvelarde <hector.velarde@gmail.com>
Date: Wed, 18 Apr 2018 12:58:41 -0300
Subject: [PATCH] Do not use 'rel="tag"' attribute on the keywords viewlet

The referenced document is not a tag definition but a search result.

Refs. https://www.w3.org/TR/2011/WD-html5-20110113/links.html#link-type-tag
---
 CHANGES.rst                           | 4 +++-
 plone/app/layout/viewlets/keywords.pt | 2 +-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/CHANGES.rst b/CHANGES.rst
index 2aa057c2..efbbec68 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -14,7 +14,9 @@ New features:
 
 Bug fixes:
 
-- *add item here*
+- Do not use ``rel="tag"`` attribute on the keywords viewlet as the referenced document is not a tag definition but a search result;
+  use ``rel="nofollow"`` instead to avoid search crawlers hammering our sites backend.
+  [hvelarde]
 
 
 2.3.17 (2017-01-17)
diff --git a/plone/app/layout/viewlets/keywords.pt b/plone/app/layout/viewlets/keywords.pt
index afee9132..75dc9592 100644
--- a/plone/app/layout/viewlets/keywords.pt
+++ b/plone/app/layout/viewlets/keywords.pt
@@ -8,7 +8,7 @@
   <span tal:repeat="category categories">
     <a href=""
        class="link-category"
-       rel="tag"
+       rel="nofollow"
        tal:content="category"
        tal:define="quotedCat python:url_quote(category)"
        tal:attributes="href string:${context/@@plone_portal_state/navigation_root_url}/@@search?Subject%3Alist=${quotedCat}">