Xibo 1.5.2 or 1.6.0-rc1 - New RSS tickers are not displayed

Server running on Xibo 1.6.0-rc1, same behaviour noticed on version 1.5.2

Modified one ticker. After saving the changes, the Win7 client (tested both 1.5.2 1.6.0-rc1) doesn't display the ticker anymore.

I compared what is saved in the database with an older ticker in the layout.

Old:
<media id=\"148bba4b42c5d3f0f02c2c0472ee8cbd\" type=\"ticker\" duration=\"30\" lkid=\"\" schemaVersion=\"1\">\n
                            <options><direction>none</direction><copyright/><scrollSpeed>2</scrollSpeed><updateInterval>360</updateInterval><uri>http%3A%2F%2Fwebpage</uri></options>\n
                            <raw><template><![CDATA[<p>[Title]&nbsp;[Date]&nbsp;[Description]</p>\n]]></template></raw>\n
                    </media>\n

New:
<media id=\"f46ffcb7e9fcc1ccc83f839246c8a8f5\" type=\"ticker\" duration=\"15\" lkid=\"\" userId=\"1\" schemaVersion=\"1\">\n
                            <options><xmds>1</xmds><sourceId>1</sourceId><uri>http%3A%2F%2Fwebpage</uri><datasetid>0</datasetid><updateInterval>10</updateInterval><scrollSpeed>2</scrollSpeed><direction>right</direction><copyright/><numItems>5</numItems><takeItemsFrom>start</takeItemsFrom><durationIsPerItem>0</durationIsPerItem><fitText>0</fitText><itemsSideBySide>0</itemsSideBySide><upperLimit>0</upperLimit><lowerLimit>0</lowerLimit><filter/><ordering/><itemsPerPage>1</itemsPerPage></options>\n
                            <raw><template><![CDATA[<p>[Title]&nbsp;[Date]&nbsp;[Description]</p>\n]]></template><css/></raw>\n
                    </media>

I found out when removing "<xmds>1</xmds>", then the rss ticker is displayed again.
But I think it's a bit too much effort to modify the sql content everytime after changing something on the xibo webpage...
Can you please explain me what's behind this parameter?

Thanks!