Here is a list of all documented namespace variables with links to the namespaces they belong to:

• always_false : adtf::base::penguin::detail
• empty_string : a_util::strings
• has_description_v : adtf::mediadescription, adtf::mediadescription::osborn
• is_explicitly_convertible_to_v : a_util
• version_id : ifhd::v100
• white_space : a_util::strings