Breadcrumb RDF approach

http://www.data-vocabulary.org/Breadcrumb/

Property	Description
title	The title of a breadcrumb.
url	The URL of a breadcrumb.
child	The next breadcrumb in the hierarchy. The child must be another Breadcrumb item.

Sample copy from LINEQ

<div itemscope itemtype="http://data-vocabulary.org/Breadcrumb" class="breadcrumb">
 <a href="/tag" itemprop="url" class="breadcrumb_top url N=a:qtr.path">
  <span itemprop="title">話題</span>
 </a>
 <span itemprop="child" itemscope itemtype="http://data-vocabulary.org/Breadcrumb" class="breadcrumb_child">
  <a href="/tag/208" itemprop="url" class="url N=a:qtr.path">
  <span itemprop="title">日本旅行</span></a></span><span itemprop="child" itemscope itemtype="http://data-vocabulary.org/Breadcrumb" class="breadcrumb_child">
  <a href="/tag/360" itemprop="url" class="url N=a:qtr.path"><span itemprop="title">日文</span></a>
 </span> 
</div> itemprop="title">日文