Here are a couple common representations of data sets:
username | realname | phone
---------+------------+----------
jdavis | Jeff Davis | 555-1212
jsmith | John Smith | 555-2323
or
<users>
<user>
<username>jdavis</username>
<realname>Jeff Davis</realname>
<phone>555-1212</phone>
</user>
<user>
<username>jsmith</username>
<realname>John Smith</realname>
<phone>555-2323</phone>
</user>
</users>