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example 2.5 has alt text: alt="Bar Chart showing average rainfall in millimetres by country and season."> the long description follows in a paragraph...there should be a reference to the long description in the alt text, given that there is no programmatic association between the image and the long description. suggest something like: alt="Bar Chart showing average rainfall in millimetres by country and season. <add>long description immediately below</add>"
have added figure/figcaption + aria to provide grouping and association <figuer role="group" aria-labelledby="caption"> <img src="rainchart.gif" alt="Bar chart: Average rainfall in millimetres by Country and Season."> <table> <caption id="caption">Rainfall in millimetres by Country and Season.</caption> <tr><td><th scope="col">UK <th scope="col">Japan<th scope="col">Australia</tr> <tr><th scope="row">Spring <td>5.5 (highest)<td>2.4 <td>2 (lowest)</tr> <tr><th scope="row">Summer <td>4.5 (highest)<td>3.4<td>2 (lowest)</tr> <tr><th scope="row">Autumn <td>3.5 (highest) <td>1.8 <td>1.5 (lowest)</tr> <tr><th scope="row">Winter <td>1.5 (highest) <td>1.2 <td>1 lowest</tr> </table> </figure>