enable sku as anchor in html response writer

defaults/solr.collection.schema

@@ -18,6 +18,18 @@ sku
 ## last-modified from http header, date (mandatory field)
 last_modified
 
+## if date expressions can be found in the content, these dates are listed here in order of the appearances"),
+#dates_in_content_sxt
+
+## the number of entries in dates_in_content_sxt
+#dates_in_content_count_i    
+
+## if dates_in_content_sxt is filled, this contains the oldest date from the list of available dates"),
+#date_in_content_min_dt
+
+## if dates_in_content_sxt is filled, this contains the youngest date from the list of available dates, that may also be possibly in the future"),
+#date_in_content_max_dt
+    
 ## mime-type of document, string (mandatory field)
 content_type
 

source/net/yacy/cora/federate/solr/responsewriter/HTMLResponseWriter.java

@@ -168,7 +168,11 @@ public class HTMLResponseWriter implements QueryResponseWriter {
             writer.write("<dt>");
             writer.write(entry.getKey());
             writer.write("</dt><dd>");
-            XML.escapeAttributeValue(entry.getValue(), writer);
+            if (entry.getKey().equals("sku")) {
+                writer.write("<a href=\"" + entry.getValue() + "\">" + entry.getValue() + "</a>");
+            } else {
+                XML.escapeAttributeValue(entry.getValue(), writer);
+            }
             writer.write("</dd>\n");
         }
         writer.write("</dl>\n");