{* Default navigation view is full.html *}
{assign var='view' value=$view|default:'default'}

{* Default classes is "default default-default" (navbar view is "navbar navbar-default") *}
{assign var='class' value=$class|default:"$view-default"}

{* Navigation usually extends from active page up to level 1 (home), but can be stopped short of that *}
{assign var='level' value=$level|default:1}

{* Navigation is usually built down from home, but a specific page id can be set as root instead *}
{assign var='head' value=$head|default:0}

{* Default to wrapping navigation in <nav> element *}
{assign var='nav' value=$nav|default:true}

{if $nav}<nav role="navigation" class="{$view} {$class} head-{$head} level-{$level}">{/if}
  {call controller=navigation action=nav view=$view level=$level head=$head id=$id}
{if $nav}</nav>{/if}