html5 - Product size: width, height and depth -

i'm using schema.org definition represent product. have doubt product size: should specify unit of measure in field?

here's code (i need separate span "cm" style differently):

<div itemscope itemtype="http://schema.org/product">     <h1 itemprop="name">product name</h1>      size:      <span itemprop="width">60 <span>cm</span></span>     <span itemprop="height">50 <span>cm</span></span>     <span itemprop="depth">40 <span>cm</span></span> </div> 

is correct way define size?

the width/depth/height properties expect distance or quantitativevalue value.

if want use distance:

as distance type not seem define suitable property provide actual value, , description says values have

[…] form '<number> <length unit of measure>'. e.g., '7 ft'.

i assume type should not provided explicitly, e.g.:

<span itemprop="width">   60 <span>cm</span> </span> 

if type should provided, guess using name option:

<span itemprop="width" itemscope itemtype="http://schema.org/distance">   <span itemprop="name">60 <span>cm</span></span> </span> 

if want use quantitativevalue:

<span itemprop="width" itemscope itemtype="http://schema.org/quantitativevalue">   <span itemprop="value">60</span>   <span>cm</span>   <meta itemprop="unitcode" content="cmt" /> </span> 

instead of specifying un/cefact code "cm" (= cmt) in meta element (which allowed in body, if use microdata), use data element:

<span itemprop="width" itemscope itemtype="http://schema.org/quantitativevalue">   <span itemprop="value">60</span>   <data itemprop="unitcode" value="cmt">cm</data> </span>