XPath select wsdl 前缀命名空间

Question

我在 java 中使用 XPath 1.0 并想 select/check wsdl 文档名称空间，但不幸的是没有成功。我愿意 select

命名空间 xmlns="http://schemas.xmlsoap.org/wsdl/" 表示为 "definitions" 元素的属性
命名空间 xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" 表示为 "definitions" 元素的属性。

我试过 XPath 表达式：

"//namespace:: * "和"/*/namespace:: * "，看似神秘，因为他们 return:

"http: //www.w3.org/2001/XMLSchema", 
"http: //www.w3.org/XML/1998/namespace" ????? (where does it come from?)

"/definitions/@*" returns:

HelloService
"http ://www.examples.com/wsdl/HelloService.wsdl"

有什么方法可以使用 XPath 在本文档中捕获 xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" 和 xmlns="http://schemas.xmlsoap.org/wsdl/" attributes/namespaces 吗？或者其他一些工具？检查节点（属性）或命名空间值是否等于 schemas.xmlsoap.org/wsdl/soap（正确的命名空间控制类型）

Wsdl document:
<definitions name="HelloService"
   targetNamespace="http://www.examples.com/wsdl/HelloService.wsdl"
   xmlns="http://schemas.xmlsoap.org/wsdl/"
   xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
   xmlns:tns="http://www.examples.com/wsdl/HelloService.wsdl"
   xmlns:xsd="http://www.w3.org/2001/XMLSchema">

   <message name="SayHelloRequest">
      <part name="firstName" type="xsd:string"/>
   </message>
   <message name="SayHelloResponse">
      <part name="greeting" type="xsd:string"/>
   </message>

   <portType name="Hello_PortType">
      <operation name="sayHello">
         <input message="tns:SayHelloRequest"/>
         <output message="tns:SayHelloResponse"/>
      </operation>
   </portType>

   <binding name="Hello_Binding" type="tns:Hello_PortType">
   <soap:binding style="rpc"
      transport="http://schemas.xmlsoap.org/soap/http"/>
   <operation name="sayHello">
      <soap:operation soapAction="sayHello"/>
      <input>
         <soap:body
            encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
            namespace="urn:examples:helloservice"
            use="encoded"/>
      </input>
      <output>
         <soap:body
            encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
            namespace="urn:examples:helloservice"
            use="encoded"/>
      </output>
   </operation>
   </binding>

   <service name="Hello_Service">
      <documentation>WSDL File for HelloService</documentation>
      <port binding="tns:Hello_Binding" name="Hello_Port">
         <soap:address location="http://www.examples.com/SayHello/"/>
      </port>
   </service>
</definitions>

Answer 1

第一个：

/*/namespace::*[name()='']

结果：http://schemas.xmlsoap.org/wsdl/

第二个：

/*/namespace::*[name()='soap']

结果：http://schemas.xmlsoap.org/wsdl/soap/

您应该记得在 java:

中启用名称空间支持

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setNamespaceAware(true); //This is really important, without it that XPath does not work
DocumentBuilder db = dbf.newDocumentBuilder();
Document document = db.parse(inputSource); //inputSource, inputStream or file which contains your XML.
XPath xpath = XPathFactory.newInstance().newXPath();
String nameSpace = xpath.evaluate("/*/namespace::*[name()='']", document);
String soapNameSpace = xpath.evaluate("/*/namespace::*[name()='soap']", document);

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