Xquery issue

Hello,
The Xquery description in the soapui manual says that the it
"resulting in an assertion that will not fail if the items come in another order and/or get more/other data "around" the id element"

However, I notice that when I get more elements than the ones defined in the list, my assertions fails. Not sure I am doing something wrong.

My xquery is

declare namespace ns1='.......hidden';

{
for $z in //ns1:GetRecommendationsResponse[1]/ns1:GetRecommendationsResult[1]/ns1:Airings[1]/ns1:Airing/ns1:AiringRating/text()
order by $z return {data($z)}
}


Expected Result:

  TV-14
  TV-14
  TV-14


Now if I get more or less than 3 airingsRatings my assertion fails with this error.

XQuery Match Assertion failed for path [declare namespace ns1='http://services.tvguide.com/v4/smartrecommendations';  { for $z in //ns1:GetRecommendationsResponse[1]/ns1:GetRecommendationsResult[1]/ns1:Airings[1]/ns1:Airing/ns1:AiringRating/text() order by $z return  {data($z)}  }  ] : Exception:org.custommonkey.xmlunit.Diff [different] Expected number of child nodes '7' but was '9' - comparing  at /ALI[1] to  at /ALI[1]


your input is appreciated.

Thanks

Ali