I've looked at a lot of posts in the forum and I haven't found the answer to this simple question: a lot of XOOPS sites (including xoops.org) do not show a "complete" url on the home page. Ex.:

[complete]http://www.mysite.org/modules/news/
[hidden]http://www.mysite.org/

Is that possible because those sites use Simplify URL module/hack? How can I prevent the "modules/news/" string to be shown?

It is a css problem. Go in admin/Templates/xcgal menu.
Then, open the template "xcgal_dsiplay.html". In the file, you should see something like this:

-----
<{if $pic_caption !=''}>
<tr>
<td style="text-align: left;">
<div style="margin: 3px 10px 10px 10px;"><{$pic_caption}></div>
</td>
</tr>
<{/if}>
</table>
<!-- END img_desc -->
-----

The problem is simple, those tags are in a "td" cell that has a nowrap setting for white-space. You have to set it back to normal for the description. So, add the "white-space:normal;" attribute:

-----
<{if $pic_caption !=''}>
<tr>
<td style="text-align: left; white-space: normal;">
<div style="margin: 3px 10px 10px 10px;"><{$pic_caption}></div>
</td>
</tr>
<{/if}>
</table>
<!-- END img_desc -->
-----

For the title, you have probably something like:

----
<{if $pic_title!=''}>
<tr>
<th>
<{$pic_title}>
</th>
</tr>
<{/if}>
----

Do the same:

----
<{if $pic_title!=''}>
<tr>
<th style="white-space: normal;">
<{$pic_title}>
</th>
</tr>
<{/if}>
----

Hope it will help.

I've looked at the ATOM specification briefly (few seconds) and it seems to be pretty different than RSS. I'm doing a hack for the module to make it use the magpie RSS/ATOM parser instead of the sax xml parser. Magpie does not validate the feed but seems to handle most feed types.