You want to link a different URL for each item in different drilldown levels.
<row>
<level1>klipfolio.com</level1>
<link1>http://www.klipfolio.com</link1>
<level2>Developer Guide</level2>
<link2>/devguide/sdk</link2>
<level3>Supported CSS Properties</level3>
<link3>/devguide/apa</link3>
</row>
Then, to tell the Klip to "use the URL in <link1> as the link for the <level1> content, and they both belong to drilldown level 1", do this:
level1 {
type:enum;
drilldown: 1;
itemcol: 1;
}
link1 {
type: link;
drilldown: 1;
}
And so on for the other levels.
To open the link for a particular item, the user right-clicks on the desired item and selects "Open link" from the item menu.
To try a Klip that demonstrates the above, download the sample Klip.