为什么SimpleXML无法识别字段

I'm parsing XML with Simple XML, but there is name that it doesn't looks to understand, for instance

XML

<item>
         <art_id>34759</art_id>
         <kind>Car</kind>
         <tics.item.dimension>215/55 R 16</tics.item.dimension>
      </item>

SIMPLE XML COMMAND

echo $item->art_id; // works
echo $item->tics.item.dimension; // does not work, it shows "itemdimension" but there is value so it should show the value

DO I have to do something in order to explain to simpexml that . is into the namespace of the XML? I think this is the issue...

Thanks in advance

Just use:

$item->{'tics.item.dimension'}

I'm late for your editing :)