我有一个xml文件，它是来自webservice的响应，它包含了各种名称空间。当我尝试用适当的xsd验证它时，它抛出“org.xml.sax.saxparseexception:cvc elt.1:找不到元素soap的声明-env:envelope“.”所有命名空间的命名空间声明都在响应中声明。下面是我的代码

try {
        DocumentBuilderFactory xmlFact = DocumentBuilderFactory.newInstance();
            SchemaFactory schemaFactory = SchemaFactory
            .newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
            SAXSource mainInputStream = new SAXSource(new InputSource(new FileInputStream(new File("FIXEDINCOME_v3_0.xsd"))));
            SAXSource importInputStream1 =new SAXSource(new InputSource(new FileInputStream(new File("Rating.xsd"))));
            SAXSource importInputStream2 = new SAXSource(new InputSource(new FileInputStream(new File("Datatypes.xsd"))));
            Source[] sourceSchema = new SAXSource[]{mainInputStream , importInputStream1, importInputStream2};
            Schema schema = schemaFactory.newSchema(sourceSchema);  
            xmlFact.setNamespaceAware(true);
            xmlFact.setSchema(schema);
            DocumentBuilder builder = xmlFact.newDocumentBuilder();
            xmlDOC = builder.parse(new InputSource(new StringReader(inputXML)));
            NamespaceContext ctx = new NamespaceContext() {
                public String getNamespaceURI(String prefix) {
                    String uri;
                    if (prefix.equals("ns0"))
                        uri = "http://namespace.worldnet.ml.com/EDS/Standards/Common/Service_v1_0/";
                    else if (prefix.equals("ns1"))
                        uri = "http://namespace.worldnet.ml.com/EDS/Product/Services/Get_Product_Data_Svc_v3_0/";
                    else if (prefix.equals("ns2"))
                        uri = "http://namespace.worldnet.ml.com/DataSOA/Product/Objects/FixedIncome/FixedIncome_v3_0/";
                    else if (prefix.equals("ns3")) {
                        uri = "http://namespace.worldnet.ml.com/DataSOA/Product/Objects/Rating/Rating_v2_0/";
                    } else if (prefix.equals("SOAP-ENV")) {
                        uri = "http://schemas.xmlsoap.org/soap-envelope/";
                    } else
                        uri = null;

                    return uri;
                }

                // Dummy implementation - not used!
                public Iterator getPrefixes(String val) {
                    return null;
                }

                // Dummy implemenation - not used!
                public String getPrefix(String uri) {
                    return null;
                }
            };

            XPathFactory xpathFact = XPathFactory.newInstance();
            xPath = xpathFact.newXPath();
            xPath.setNamespaceContext(ctx);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }