Sets the string label associated with the click.
This label is stored as is by the Log Manager. It must include enough information to qualify the context of the click (where the link comes from, etc.).
It is usually made of a static qualifying part ("click on reply", "filtering on facet", an so on) and of a dynamic part (number of the reply, name and value of the filter, etc.).
Optional. The string must be CGI-encoded and UTF-8 clean. The default value is an empty label.
afs:label="Click on reply number 5, http://foo.bar"