I am trying create a XQuery to generate a following details of the xml tag used with the no. of occurrence

Book- 3 occurrence
Article-2 occurrence
conference - 1 occurrence

Is this possible? i've been trying but it does not work

```
<test>
   <book>
        <year>1992</year>
   ....
   </book>
   <article>
        <year>1992</year>
   ....
   </article>
   <conference>
        <year>1992</year>
   ....
   </conference>
   <article>
        <year>1992</year>
   ....
   </article>
   <book>
        <year>1992</year>
   ....
   </book>
   <book>
        <year>1992</year>
   ....
   </book>
</test>

```