<a href="file://xxxxxxx">ex1</a>
<a href="ftp://xxxxxxxx">ex2</a>
<a href="gopher://xxxxx">ex3</a>
<a href="http://xxxxxxx">ex4</a>
<a href="https://xxxxxx">ex5</a>
<a href="mailto:xxxxxxx">ex6</a>
<a href="news:xxxxxxxxx">ex7</a>
<a href="telnet://xxxxx">ex8</a>
<a href="wais://xxxxxxx">ex9</a>
<a href="gopher://xxxx">ex10</a>