getNodeValue return null if I add ns

<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
   <soap:Body>
      <CheckCity xmlns="http://some ns here">
         <Result>
            <table>
               <country>CountryA</country>
               <city>CityA</city>
            </table>
            <table>
               <country>CountryB</country>
               <city>cityB</city>
            </table>
            <table>
               <country>CountryC</country>
               <city>cityC</city>
            </table>
         </Result>
      </CheckCity>
   </soap:Body>
</soap:Envelope>

I need to check that CountyA has city A, CountryB has city B, CountryC hs City C 

I can't city value for the country. getNOdeValue returns null

def groovyUtils=new com.eviware.soapui.support.GroovyUtils(context)

def holder=groovyUtils.getXmlHolder("SOAP#Response")
def soap = new groovy.xml.Namespace("http://schemas.xmlsoap.org/soap/envelope/", 'soap')
holder.namespaces["ns"] = "http://some ns here"


def a = holder.getNodeValue("//ns:table[country='CountryA']//*:city")

log.info a 

If I remove ns from xml and use smth like def a = holder.getNodeValue("//*:table[country='CountryA']//*:city") works ok