/td></tr>
<tr><td valign="top"><a href="#get_tab_width-1">get_tab_width/1</a></td><td>
  Gets the tab width from the tree metadata record.</td></tr>
<tr><td valign="top"><a href="#is_a_function-1">is_a_function/1</a></td><td>
  It returns <code>true</code> if the node represents a function, otherwise
  it returns <code>false</code>.</td></tr>
<tr><td valign="top"><a href="#is_expression_or_function-1">is_expression_or_function/1</a></td><td>
  Checks the category of the Node and returns true if it is
  "exp