It should and does work, I've tested the scenario before releasing the plugin.  It may not work via the product configuration panel since I think theres some items missing in the feature manifest but should definitely work if you go directly to the update manager.

On Aug 4, 2006, at 4:18 PM, Lin Sun wrote:

Hi there,

Has anyone tried to migrate from 1.0 eclipse plugin to 1.1 eclipse plugin
using the update manager?

I tried to issue a scan for update of org.apache.geronimo.feature 1.0.0  in
the product configuration panel (in Eclipse) but it didn't return any update
of the feature.

I didn't quite understand this, as in the site.xml, we have:

<feature url="features/org.apache.geronimo.feature_1.0.0.jar"
id="org.apache.geronimo.feature" version="1.0.0">
<category name="Geronimo Server Adapter"/>

<feature url="features/org.apache.geronimo.feature_1.1.0.jar"
id="org.apache.geronimo.feature" version="1.1.0">
<category name="Geronimo Server Adapter"/>

I had hoped that above would make the update manager to recognize that there
is a newer version of the feature, but apparently it doesn't.