Sometimes an element has no PCDATA.
<name nickname='007'>
<first>James</first>
<middle></middle <!--James does not have middle name --> >
<last>Bond</last>
</name>
You can write this element using a self-closing tag:
<middle/>
The / and > always have to be together
<middle /> or this <middle/>
but not like this <middle/ > or this <middle / >
Empty elements are used for elements with no PCDATA but attributes.
<name first="Bond"
middle="James"
last="Last"/>