using System;

using System.Collections.Generic;

using System.Linq;

using System.Xml.Linq;

public class Program

{

    public static void Main()

    {

        string xml = "<retDistDFeInt xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" versao=\"1.01\" xmlns=\"http://www.portalfiscal.inf.br/nfe\">\n <tpAmb>1</tpAmb>\n <verAplic>1.1.9</verAplic>\n <cStat>138</cStat>\n <xMotivo>Documento(s) localizado(s)</xMotivo>\n <dhResp>2018-10-09T13:01:42-03:00</dhResp>\n <ultNSU>000000000000000</ultNSU>\n <maxNSU>000000000000013</maxNSU>\n <loteDistDFeInt>\n <docZip NSU=\"000000000000001\" schema=\"resNFe_v1.01.xsd\">XYZABCdUKAAF...etc</docZip>\n <docZip NSU=\"000000000000002\" schema=\"resNFe_v1.01.xsd\">XYZABCdUKAAF...ec</docZip>\n </loteDistDFeInt>\n</retDistDFeInt>";

​

            XElement elements = XElement.Parse(xml); // XElement.Parse(stringWithXmlGoesHere)

            XNamespace df = elements.Name.Namespace;

            var loteDistDFeIntElements = elements.Element(df + "loteDistDFeInt").Elements();

            var retorno = from nota in elements.Element(df + "loteDistDFeInt").Elements()

                          select new

                          {

                              nsu = (string)nota.Attribute("NSU").Value,

                              schema = (string)nota.Attribute("schema").Value

                          };

       foreach(var nota in retorno)

            {

                Console.WriteLine(string.Concat(nota.nsu, " ", nota.schema));

            }

    }

}