Extract XML element form XML payload

Content

From BI report i am getting the response as bytes and encoded this response and assign to string. Now i need to extract only the <DATA_DS> XML element in the response.

<execute xmlns:ns2="http://xmlns.oracle.com/cloud/generic/rest/fault/REST/BIResponse&quot; xmlns:ns1="http://xmlns.oracle.com/cloud/adapter/REST/BIResponse_REQUEST&quot; xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/&quot; xmlns:nsmpr2="http://xml.oracle.com/types/REST/BIResponse_REQUEST&quot; xmlns:xml="http://www.w3.org/XML/1998/namespace&quot; xmlns:nsmpr1="http://xmlns.oracle.com/oxp/service/v2&quot; xmlns:nstrgmpr="http://xmlns.oracle.com/cloud/adapter/REST/BIResponse_REQUEST/types&quot