How can I choose an entry from xml ?

Hi, let's say I made a articles' section with 2 entries.
<code>
<titlecontent>
<section id="8" handle="title-content-section">TitleAndContent</section>
<entry id="9">
<title>1st article</title>
<content><1st article description></content>
</entry>
<entry id="12">
<title>2nd article</title>
<content><2nd article></content>
</entry>
</titlecontent>
</code>
Now, I've created 2 pages let's say articleOne.html and articleTwo.html

How can I choose which entry should be associated with a page ?

Thanks.