如何在c＃中读取xsd文档值

Question

如何在c＃中读取xsd文档值？

示例：

    XmlSchemaAttribute awdaw = new XmlSchemaAttribute();
    XmlSchemaAnnotation annotation = new XmlSchemaAnnotation();
    XmlSchemaDocumentation doc = new XmlSchemaDocumentation();

    doc.Markup = TextToNodeArray("description");
    doc.Language = "en";
    annotation.Items.Add(doc);
    awdaw.Annotation = annotation;
    readXMLdocumentation(awdaw);

    string readXMLdocumentation(XmlSchemaAttribute att)
    {
        var wada = new XmlSchemaAnnotation();
        wada = att.Annotation;
        wada.Items.??????
    }

但我如何获得文档价值？