title: what is the differences between class and dataType
body: <p>As i read through UML specification that:</p>
  
  <pre><code> class has a set of attributes/operations
  and data type has a set of attributes/operations
  </code></pre>
  
  <p>1)with regards to attributes/operations of data type
  what this means?</p>
  
  <p>because i don't know how such a data type has attributes and operations?</p>
  
  <p>2)What’s the main difference between a class and a datatype?</p>