дал XSD с помощью Visual StudioXML Tools. И я использую следующий код C # для проверки XML и сталкиваюсь с этой ошибкой.

ошибка

Элемент не объявленhttp://www.w3.org/2000/09/xmldsig#:Signature».

Итак, мой вопрос, как это исправить, потому что в режиме редактирования XML действителен на 100%?

Спасибо!

C #

  private void buttonValidateXML_Click(object sender, EventArgs e)
        {
            try
            {            
                bool result = IsValidXml2(textBoxSignedXML.Text, textBoxXSDFile.Text, "");
                rtbValidationResult.Text = result.ToString();
            }
            catch (Exception ex)
            {
                rtbValidationResult.Text = ex.Message;
            }
        }

public static bool IsValidXml2(string xmlFilePath, string xsdFilePath, string namespaceName)
        {
            var xdoc = XDocument.Load(xmlFilePath);
            var schemas = new XmlSchemaSet();
            schemas.Add(namespaceName, xsdFilePath);

            bool result = true;
            xdoc.Validate(schemas, (sender, e) =>
            {
                result = false;
            });

            return result;
        }

XML

<?xml version="1.0" encoding="utf-8"?>
<Envelope version="1">
  <Deposit>
    <ClientId>1234567890123</ClientId>
    <Account>0045678</Account>
    <Currency>USD</Currency>
    <Total>5000.00</Total>
    <SignedDate>2016-02-15</SignedDate>     
    <Cheques>
      <Cheque>
        <Images>
          <Front>
            SUkqAAgAAAAPAP4ABAABAAAAAAAAAAABBAABAAAAfQUAAAEBBAABAAAAWgIAAAIBAwABAAAAAQAA
            AAMBAwABAAAABAAAAAYBAwABAAAAAAAAAA4BAgAhAAAA0AAAABEBBAABAAAAAAIAABIBAwABAAAA
            AQAAABUBAwABAAAAAQAAABYBBAABAAAAWgIAABcBBAABAAAAvi8AABoBBQABAAAAAAEAABsBBQAB
            EdF0fRG0R0YRdH2R2XzaI6OxRQAQAQA=
          </Front>
          <Back>
            SUkqAAgAAAAOAP4ABAABAAAAAAAAAAABBAABAAAAgQUAAAEBBAABAAAAVAIAAAIBAwABAAAAAQAA
            AAMBAwABAAAABAAAAAYBAwABAAAAAAAAABEBBAABAAAAAAEAABIBAwABAAAAAQAAABUBAwABAAAA
            AQAAABYBBAABAAAAVAIAABcBBAABAAAAcggAABoBBQABAAAAwAAAABsBBQABAAAA0AAAACgBAwAB
            AAAAAgAAAAAAAAAAAAAAAAAAAAAAyAAAAAEAAAAAAAAAAAAAAMgAAAABAAAAAAAAAAAAAAAAAAAA
            AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAP//LZCdO1f7iRrKXTqt//pePx///9lNoL487Ajh
            jFyzUrtwg+6gg9VmvCIWA42XMwziSUEEw7GoIcSUWZ3Y0oKmGR3LToGVC2LhkK6H4sorQNRUMLjH
            LTGzlpv3RFCcH4NLB9hvLTmD8tMgOsG+WVaR5AweTcEWMMfaDQxDIx5NwVQx8OMPeGFHLSUlLcSS
            1JtNV/9/rrffuO+h9bx////kfvABABAA
          </Back>
        </Images>
        <MicrCodeCmc>123456789012345678901234567890</MicrCodeCmc>
        <Amount>465.22</Amount>
        <PaymentDate>2016-02-15</PaymentDate>
        <EmissionDate>2016-02-15</EmissionDate>
      </Cheque>
      <Cheque>
        <Images>
          <Front>
            SUkqAAgAAAAPAP4ABAABAAAAAAAAAAABBAABAAAAfQUAAAEBBAABAAAAWgIAAAIBAwABAAAAAQAA
            AAMBAwABAAAABAAAAAYBAwABAAAAAAAAAA4BAgAhAAAA0AAAABEBBAABAAAAAAIAABIBAwABAAAA
            AQAAABUBAwABAAAAAQAAABYBBAABAAAAWgIAABcBBAABAAAAvi8AABoBBQABAAAAAAEAABsBBQAB
            EdF0fRG0R0YRdH2R2XzaI6OxRQAQAQA=
          </Front>
          <Back>
            SUkqAAgAAAAOAP4ABAABAAAAAAAAAAABBAABAAAAgQUAAAEBBAABAAAAVAIAAAIBAwABAAAAAQAA
            AAMBAwABAAAABAAAAAYBAwABAAAAAAAAABEBBAABAAAAAAEAABIBAwABAAAAAQAAABUBAwABAAAA
            AQAAABYBBAABAAAAVAIAABcBBAABAAAAcggAABoBBQABAAAAwAAAABsBBQABAAAA0AAAACgBAwAB
            AAAAAgAAAAAAAAAAAAAAAAAAAAAAyAAAAAEAAAAAAAAAAAAAAMgAAAABAAAAAAAAAAAAAAAAAAAA
            AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAP//LZCdO1f7iRrKXTqt//pePx///9lNoL487Ajh
            jFyzUrtwg+6gg9VmvCIWA42XMwziSUEEw7GoIcSUWZ3Y0oKmGR3LToGVC2LhkK6H4sorQNRUMLjH
            LTGzlpv3RFCcH4NLB9hvLTmD8tMgOsG+WVaR5AweTcEWMMfaDQxDIx5NwVQx8OMPeGFHLSUlLcSS
            1JtNV/9/rrffuO+h9bx////kfvABABAA
          </Back>
        </Images>
        <MicrCodeCmc>123456789012345678901234567890</MicrCodeCmc>
        <Amount>99999999999</Amount>
        <PaymentDate>2016-02-15</PaymentDate>
        <EmissionDate>2016-02-15</EmissionDate>
      </Cheque>
    </Cheques>
  </Deposit>   
  <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
    <SignedInfo>
      <CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" />
      <SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1" />
      <Reference URI="">
        <Transforms>
          <Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature" />
        </Transforms>
        <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" />
        <DigestValue>TVO2Gssf5TUdXFYG/PrHDyqYFqs=</DigestValue>
      </Reference>
    </SignedInfo>
    <SignatureValue>KwQInN03ywa0u0t4HedxgE1fOU7XYLQScKuQ6vdYoIZME5Hm5jpFeX2ORA2U+BO7JNjmFilTW05VntS3k98YCZhNXH9Iw/YEC1nw4JJLzygYbbCftkiY5v5+b494mQPryCtscwTtbziW6QilILSFDGmco2JopRfVe+qfdN/JyB1HXhUfApyNEsw/cJLj6aaz5ivN1sLFgAlikbwCNpF+mRnZY5u7/S8uT8WhEyK32EcatdjzKbP0PwnIlumhOpUMerWeLZ7neuJq6R/IuFgZ1Y5U6ppyuOjhtiHp4glC/uNUS/y7jMzG29thWBkEtSE9AcEt2IZ0HOEZE3kdFXufjA==</SignatureValue>
  </Signature>
</Envelope>

XSD

<?xml version="1.0" encoding="utf-8"?>
<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema"
           xmlns:tns="http://example.com/ct-required"
           xmlns:xmime="http://www.w3.org/2005/05/xmlmime" >

  <xs:import namespace="http://www.w3.org/2005/05/xmlmime"
            schemaLocation="http://www.w3.org/2005/05/xmlmime"/>

    <xs:import namespace="http://www.w3.org/2000/09/xmldsig#" schemaLocation="xmldsig-core-schema.xsd"/>

  <xs:simpleType name="PNGPictureType"
          xmime:expectedContentTypes="image/png">
    <xs:restriction base="xs:base64Binary"/>
  </xs:simpleType>

  <xs:simpleType name="Money">
    <xs:restriction base="xs:decimal">
      <xs:totalDigits value="13" />
      <xs:fractionDigits value="2" />
      <xs:minInclusive value="0.00" />
      <xs:maxInclusive value="99999999999.99" />
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="Currency">
        <xs:annotation>
            <xs:documentation>Currency Code: ISO 4217</xs:documentation>
        </xs:annotation>
        <xs:restriction base="xs:string">
            <xs:enumeration value="USD" />
            <xs:enumeration value="UYU" />
            <xs:minLength value="3" />
            <xs:maxLength value="3" />
        </xs:restriction>
    </xs:simpleType>

  <xs:element name="Envelope">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="Deposit" minOccurs="1" maxOccurs="1">
          <xs:complexType>
            <xs:sequence>
              <xs:element name="ClientId" type="xs:unsignedLong" />
              <xs:element name="Account" type="xs:unsignedLong" />
              <xs:element name="Currency" type="Currency" />
              <xs:element name="Total" type="Money" />
              <xs:element name="SignedDate" type="xs:date" />
              <xs:element name="Cheques">
                <xs:complexType>
                  <xs:sequence>
                    <xs:element maxOccurs="unbounded" name="Cheque">
                      <xs:complexType>
                        <xs:sequence>
                          <xs:element name="Images">
                            <xs:complexType>
                              <xs:sequence>
                                <xs:element name="Front" type="PNGPictureType" />
                                <xs:element name="Back" type="PNGPictureType" />
                              </xs:sequence>
                            </xs:complexType>
                          </xs:element>
                          <xs:element name="MicrCodeCmc" type="xs:string" />
                          <xs:element name="Amount" type="Money" />
                          <xs:element name="PaymentDate" type="xs:date" />
                          <xs:element name="EmissionDate" type="xs:date" />
                        </xs:sequence>
                      </xs:complexType>
                    </xs:element>
                  </xs:sequence>
                </xs:complexType>
              </xs:element>
            </xs:sequence>
          </xs:complexType>
        </xs:element>
        <xs:element xmlns:q1="http://www.w3.org/2000/09/xmldsig#" ref="q1:Signature" />
      </xs:sequence>
      <xs:attribute name="version" type="xs:unsignedByte" use="required" />
    </xs:complexType>
  </xs:element>
</xs:schema>

ОБНОВЛЕНИЕ № 1

Я пробовал разные подходы, но не радости.

И даже если я ссылаюсь на локальный файл XSD, он не работает. Я вижу ту же ошибку.

 <xs:import namespace="http://www.w3.org/2000/09/xmldsig#" schemaLocation="http://www.w3.org/TR/2002/REC-xmldsig-core-20020212 file:///C:/Temp/xmldsig-core-schema.xsd"/>

ОБНОВЛЕНИЕ № 2

Даже я использую этот подход не радость.

 public static bool IsValidXml1(string xmlFilePath, string xsdFilePath, string namespaceName)
        {
            XDocument xdoc = null;
            var settings = new XmlReaderSettings();
            settings.DtdProcessing = DtdProcessing.Ignore;
            settings.ProhibitDtd = false;

            try
            {
                using (XmlReader xr = XmlReader.Create(xmlFilePath, settings))
                {
                    xdoc = XDocument.Load(xr);
                    var schemas = new XmlSchemaSet();
                    schemas.Add(namespaceName, xsdFilePath);
                    schemas.Add(@"http://www.w3.org/2000/09/xmldsig#", @"D:\Temp\xmldsig-core-schema.xsd");
                    xdoc.Validate(schemas, null);

                    return true;
                }                
            }
            catch (XmlSchemaValidationException ex)
            {
                // throw;
            }

            return false;
        }