unique attribute values with jquery
<p>is there a way to get all the unique values for a certain attribute.</p>

<p>e.g</p>

<pre><code>&lt;div class="bob" data-xyz="fish"&gt;&lt;/div&gt;
&lt;div class="bob" data-xyz="dog"&gt;&lt;/div&gt;
&lt;div class="bob" data-xyz="fish"&gt;&lt;/div&gt;
&lt;div class="bob" data-xyz="cat"&gt;&lt;/div&gt;
&lt;div class="bob" data-xyz="fish"&gt;&lt;/div&gt;
</code></pre>

<p>I need to get all the distinct values for data-xyz attribute on div.bob,</p>

<p>so it should return fish, dog and cat.</p>
