Soap Request: Webservice expect List<String>

Hey,

I want to set an SoapUi Request. The Webservice expect an StringList. The StringList content is optional.

I wanna fill the StringList but i dont know how. He runs the Webservice but the StringList is always empty.
I tryed it like its recommended from SoapUI.

 <shopList>
          <string>content</string>
          <string>otherContent</string>
         </shopList>

But that doesnt work.

What i make wrong ?

Thank you for your Time/help

greetings