Starting point below. It's marked community wiki, so please contribute.

In XHTML+RDFa:

• add the @about attribute to indicate the topic, which is for each row, so on <tr>
• namespace prefix dc -> Dublin Core
• does anyone know a common ontology for dimensions? height below?
• using @content to give machine readable version of the value
• using the geonames.org ontology (wgs84_pos prefix) as suggested in another comment

<tr about="http://en.wikipedia.org/wiki/Burj_Dubai">
  <td><a href="/wiki/Burj_Dubai" rel="dc:title"
         title="Burj Dubai">Burj Dubai</a></td>
  <td><span property="ex:height" content="2684" 
            datatype="xsd:integer">2,684 feet</span></td>
  <td>
    <span property="wgs84_pos:lat" content="25.19722"
             class="latitude">25°11′50.0″N</span>
    <span property="wgs84_pos:long" content="55.27406"
             class="longitude">55°16′26.6″E</span>
  </td>
</tr>

Starting point below. It's marked community wiki, so please contribute.

In XHTML+RDFa:

• add the @about attribute to indicate the topic, which is for each row, so on <tr>
• namespace prefix dc -> Dublin Core
• does anyone know a common ontology for dimensions? height below?
• using @content to give machine readable version of the value

<tr about="http://en.wikipedia.org/wiki/Burj_Dubai">
  <td><a href="/wiki/Burj_Dubai" rel="dc:title"
         title="Burj Dubai">Burj Dubai</a></td>
  <td>2,684 <td><span property="ex:height" content="2684" 
            datatype="xsd:integer">2,684 feet</td>
</span></td>
</tr>

Starting point below. It's marked community wiki, so please contribute.

In XHTML+RDFa:

• add the @about attribute to indicate the topic, which is for each row, so on <tr>
• namespace prefix dc -> Dublin Core

<tr about="http://en.wikipedia.org/wiki/Burj_Dubai">
  <td><a href="/wiki/Burj_Dubai" rel="dc:title"
         title="Burj Dubai">Burj Dubai</a></td>
  <td>2,684 feet</td>
</tr>