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is this other site also powered by Xoops? If not, you could take a look at this article,
RSS Feeds for Dummies (author's title, not mine) for some programming tips on how to include an RSS feed using PHP.
If you just want to check that your feed works, you can retrieve your feed in your webbrowser. Each XOOPS site automatically has an RSS news feed available at:
<XOOPS_URL>/backend.php
So Xoops.org's RSS feed is located at:
https://xoops.org/backend.php
Open this page in your browser. If everything is working correctly the browser should display the rss feed in your browser. See the what
Xoops.org's RSS feed looks like in Mozilla.
If the other site is using Xoops, you can use the XoopsHeadline module to display your feed. First, install the module. Next, enter the Headlines administration by clicking on the "Headlines" button.
In the "Add Headlines" section fill in the following:
Site Name: The name of your website
URL:
http://www.yoursite.com/backend.phpURL of RDF/RSS file:
http://www.yoursite.com/backend.phpYou can leave the rest of the settings at the defaults. Click "Submit" to store your feed's information, then make sure the block is enabled in "System" -> "Blocks" and that the proper groups can access the headlines block in "System" -> "Groups".
Once done, navigate to the other site's home page. If everything is working properly you should now see the headlines from your site in the "Headlines" block
Good Luck!