Figure 5 a

 Document source:

 This is an example of a <A HREF="another_file.html"> hyperlink A>

The start-tag <A> and end-tag A> delimit the text, in this case the word "hyperlink, which is the beginning of the hyperlink. The "A" tag has the attribute "HREF" which gives the location of the end of the hyperlink, in the case of the file "another_file.html"

Figure 5 b

 Sample URL:

 <A HREF="http://www.nta.no:80/demo/file/another_file.html">

In this sample the protocol definition is "http"; the host address is www.nta.no, the port number 80 which is default, and the filename demo/file/another_file.html