BizTalk XmlDocumentネームスペースの新規/変更/削除の効率的な方法

public class AddXmlNamespaceStream : XmlTranslatorStream
{
    private String namespace_;
    private int level_ = 0; // hierarchy level

    public AddXmlNamespaceStream(Stream stream, String @namespace)
        : base(XmlReader.Create(stream))
    {
        namespace_ = @namespace;
    }

    #region XmlTranslatorStream Overrides

    protected override void TranslateStartElement(string prefix, string localName, string nsURI)
    {
        if (level_++ != 0)
        {
            base.TranslateStartElement(prefix, localName, nsURI);
            return;
        }

        if (String.IsNullOrEmpty(nsURI))
        {
            nsURI = namespace_;
            if (String.IsNullOrEmpty(prefix))
                prefix = "__bts_ns0__";
        }

        base.TranslateStartElement(prefix, localName, nsURI);
    }

    protected override void TranslateEndElement(bool full)
    {
        if (level_-- != 0)
        {
            base.TranslateEndElement(full);
            return;
        }

        base.TranslateEndElement(full);
    }

    #endregion
}

public class XmlNamespaceRemoverStream : XmlTranslatorStream
{
    protected override void TranslateStartElement(
        string prefix, string localName, string nsURI)
    {
        base.TranslateStartElement(null, localName, null);
    }

    protected override void TranslateAttribute()
    {
        if (this.m_reader.Prefix != "xmlns")
            base.TranslateAttribute();
    }

    public XmlNamespaceRemoverStream(Stream input)
        : base(new XmlTextReader(input), Encoding.Default)
    { }
}

public class XmlNamespaceModifierStream : XmlTranslatorStream
    {
        private const string CIN_DOCTYPE = "catalogueItemNotification";
        private const string CPN_DOCTYPE = "priceSynchronisationDocument";
        private const string ROOT_GS1_ELEMENT = "StandardBusinessDocument";
        private const string NS_PREFIX = "http://www.test.com";

        private string _newNamespaceVersion;
        private string _documentType;




        protected override void TranslateStartElement(string prefix, string localName, string nsURI)
        {
            string newNSUri = string.Empty;
            bool isElementFoundWithNamespace = false;
            bool isFirstElement = false;


            if (!string.IsNullOrEmpty(prefix) && !isFirstElement)
            {
                //element found with prefix. Modify namespace with new value and append passed namespace version 
                newNSUri = NS_PREFIX + _newNamespaceVersion;
                isElementFoundWithNamespace = true;

                if (localName.Equals(ROOT_GS1_ELEMENT))
                    isFirstElement = true;
            }


            if (isElementFoundWithNamespace & isFirstElement)
            {
                //replace with new namespace
                Debug.WriteLine(string.Format("[BTS.Utilities.CustomPipelines.NamespaceModifier.XmlNamespaceModifierStream]Replace namespace with {0}", nsURI + newNSUri));

                if (_documentType.Equals(CIN_DOCTYPE))
                    localName = localName + "Catalogue";
                if (_documentType.Equals(CPN_DOCTYPE))
                    localName = localName + "Price";

                base.TranslateStartElement(null, localName, newNSUri);
                //base.TranslateStartElement(prefix, localName, newNSUri);
            }
            else
            {
                base.TranslateStartElement(null, localName, null);
                //base.TranslateStartElement(prefix, localName, newNSUri);
            }

        }

        protected override void TranslateAttribute()
        {
            if (this.m_reader.Prefix != "xmlns" && this.m_reader.Name != "xmlns")
                base.TranslateAttribute();
        }



        public XmlNamespaceModifierStream(Stream input, string namespaceVersion, string documentType)
            : base(new XmlTextReader(input), Encoding.Default)
        {
            Debug.WriteLine("[BTS.Utilities.CustomPipelines.NamespaceModifier.XmlNamespaceModifierStream]Entered method");
            _newNamespaceVersion = namespaceVersion.Trim();
            _documentType = documentType.Trim();
            Debug.WriteLine("[BTS.Utilities.CustomPipelines.NamespaceModifier.XmlNamespaceModifierStream]Exit method");
        }
    }