如何修复错误：cvc-elt.1：找不到没有命名空间的元素“xsd:schema”的声明？

问题描述

我正在使用 input.xsd 架构文件：

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">

    <xsd:element name="Mobiles">
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element name="Mobile" type="Mobile" maxOccurs="unbounded"/>
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>

    <xsd:complexType name="Mobile">
        <xsd:sequence>
            <xsd:element name="Model" type="xsd:string"/>
            <xsd:element name="OS">
                <xsd:simpleType>
                    <xsd:restriction base="xsd:string">
                        <xsd:enumeration value="Android"/>
                    </xsd:restriction>
                </xsd:simpleType>
            </xsd:element>
            <xsd:element name="Origin" type="xsd:string"/>
            <xsd:element name="Material" type="xsd:string"/>
            <xsd:element name="Samsung" type="Samsung"/>
        </xsd:sequence>
    </xsd:complexType>

    <xsd:complexType name="Samsung" mixed="true">
        <xsd:sequence>
            <xsd:element name="Wlan">
                <xsd:simpleType>
                    <xsd:restriction base="xsd:string">
                        <xsd:enumeration value="802.11"/>
                    </xsd:restriction>
                </xsd:simpleType>
            </xsd:element>
            <xsd:element name="CardSlot" type="xsd:string"/>
            <xsd:element name="RadioAvailability" type="xsd:boolean" default="true"/>
            <xsd:element name="BluetoothAvailability" type="xsd:boolean" default="false"/>
        </xsd:sequence>
    </xsd:complexType>
</xsd:schema>

input.xml 文件看起来像：

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<Mobiles
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="input.xsd">
    <Mobile>
        <Model>G975F</Model>
        <OS>Android</OS>
        <Origin>USA</Origin>
        <Material>Plastic</Material>
        <Samsung>
            <Wlan>802.11</Wlan>
            <CardSlot>MicroSD</CardSlot>
            <RadioAvailability>true</RadioAvailability>
            <BluetoothAvailability>true</BluetoothAvailability>
        </Samsung>
    </Mobile>
    <Mobile>
        <Model>G986</Model>
        <OS>Android</OS>
        <Origin>USA-Israel</Origin>
        <Material>Silicon-Plastic</Material>
        <Samsung>
            <Wlan>802.11</Wlan>
            <CardSlot>MicroSD</CardSlot>
            <RadioAvailability>true</RadioAvailability>
            <BluetoothAvailability>false</BluetoothAvailability>
        </Samsung>
    </Mobile>
    <Mobile>
        <Model>G770F</Model>
        <OS>Android</OS>
        <Origin>Israel</Origin>
        <Material>Silicon-Plastic</Material>
        <Samsung>
            <Wlan>802.11</Wlan>
            <CardSlot>MicroSD</CardSlot>
            <RadioAvailability>true</RadioAvailability>
            <BluetoothAvailability>false</BluetoothAvailability>
        </Samsung>
    </Mobile>
</Mobiles>

为了更好地理解理论，我遵循了这个 answer 作为示例，没有命名空间的架构和 this。

但是当我尝试验证 xsd 架构文件时，我总是在控制台本地遇到问题：

cvc-elt.1: Cannot find the declaration of element 'xsd:schema'.
org.xml.sax.SAXParseException; systemId: file:///F:/IdeaProject/TestProject/input.xsd; lineNumber: 2; columnNumber: 58; cvc-elt.1: Cannot find the declaration of element 'xsd:schema'.
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:203)
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:134)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:396)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:327)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:284)
    at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.handleStartElement(XMLSchemaValidator.java:1901)
    at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.startElement(XMLSchemaValidator.java:741)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:374)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl$NSContentDriver.scanRootElementHook(XMLNSDocumentScannerImpl.java:613)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:3132)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:852)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:602)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:112)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:505)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:842)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:771)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
    at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:243)
    at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:339)
    at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:177)
    at com.epam.rd.java.basic.practice7.controller.DOMController.parse(DOMController.java:96)
    at com.epam.rd.java.basic.practice7.controller.DOMController.main(DOMController.java:331)
    at com.epam.rd.java.basic.practice7.DOMControllerTest.main(DOMControllerTest.java:11)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runchild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runchild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runchildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.runTestClass(JUnitTestClassExecutor.java:110)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:58)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:38)
    at org.gradle.api.internal.tasks.testing.junit.AbstractJUnitTestClassprocessor.processtestClass(AbstractJUnitTestClassprocessor.java:62)
    at org.gradle.api.internal.tasks.testing.SuiteTestClassprocessor.processtestClass(SuiteTestClassprocessor.java:51)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.gradle.internal.dispatch.Reflectiondispatch.dispatch(Reflectiondispatch.java:36)
    at org.gradle.internal.dispatch.Reflectiondispatch.dispatch(Reflectiondispatch.java:24)
    at org.gradle.internal.dispatch.ContextClassLoaderdispatch.dispatch(ContextClassLoaderdispatch.java:33)
    at org.gradle.internal.dispatch.ProxydispatchAdapter$dispatchingInvocationHandler.invoke(ProxydispatchAdapter.java:94)
    at com.sun.proxy.$Proxy2.processtestClass(UnkNown Source)
    at org.gradle.api.internal.tasks.testing.worker.TestWorker.processtestClass(TestWorker.java:118)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.gradle.internal.dispatch.Reflectiondispatch.dispatch(Reflectiondispatch.java:36)
    at org.gradle.internal.dispatch.Reflectiondispatch.dispatch(Reflectiondispatch.java:24)
    at org.gradle.internal.remote.internal.hub.MessageHubBackedobjectConnection$dispatchWrapper.dispatch(MessageHubBackedobjectConnection.java:182)
    at org.gradle.internal.remote.internal.hub.MessageHubBackedobjectConnection$dispatchWrapper.dispatch(MessageHubBackedobjectConnection.java:164)
    at org.gradle.internal.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:412)
    at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
    at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56)
    at java.lang.Thread.run(Thread.java:748)

使用逻辑验证像：

public void parse(boolean validate) throws ParserConfigurationException,SAXException,IOException {
            
    System.out.println("Invoking parse()");
    // obtain DOM parser
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    
    try{
        dbf.setFeature("http://xml.org/sax/features/external-parameter-entities",false);
        dbf.setFeature("http://apache.org/xml/features/disallow-doctype-decl",true);
        dbf.setFeature("http://xml.org/sax/features/external-general-entities",false);

    } catch(ParserConfigurationException exp){
        logger.severe(MESSAGE);
        logger.severe(Arrays.toString(exp.getStackTrace()));
    }
    
    // set properties for Factory

    // XML document contains namespaces
    dbf.setNamespaceAware(true);

    // make parser validating
    if (validate) {
        // turn validation on
        dbf.setFeature(Constants.FEATURE_TURN_VALIDATION_ON,true);

        // turn on xsd validation
        dbf.setFeature(Constants.FEATURE_TURN_SCHEMA_VALIDATION_ON,true);
    }

    DocumentBuilder db = dbf.newDocumentBuilder();

    // set error handler
    db.setErrorHandler(new DefaultHandler() {
        @Override
        public void error(SAXParseException e) throws SAXException {
            // throw exception if XML document is NOT valid
            throw e;
        }
    });

    // parse XML document
    Document document = db.parse(xmlFileName);

    // get root element
    Element root = document.getDocumentElement();

    // create container
    mobiles = new Mobiles();

    // obtain mobiles nodes
    NodeList mobileNodes = root
            .getElementsByTagName(Names.MOBILE);

    // process mobiles nodes
    for (int j = 0; j < mobileNodes.getLength(); j++) {
        Mobile question = getMobile(mobileNodes.item(j));
        // add mobile to container
        mobiles.getMobileList().add(question);
    }
}

我查过类似的问题，例如 this one，但我没有不同的 uri http 和 https。

我也检查了这个 answer，但由于实现限制，我不能对 gradle 项目使用任何第三方依赖项（仅当它不是唯一的解决方案时）。

CoreFiling XML Schema Validator 有关 XML 架构和 XML 实例的报告：

XML instance present.
XML schema present.

和

Well Formed: VALID
Schema Validation: VALID

如果需要，我可以提供更多信息。如果我做错了什么，有人可以纠正我吗？提前致谢。

解决方法

错误，

cvc-elt.1：找不到没有命名空间的元素 xsd:schema 的声明？

通常表示错误地尝试将 XSD 作为验证主题传递给验证器，而不是传递预期的 XML 文件。

在您的情况下，请确保 xmlFileName 用于 XML 文件，而不是 XSD。

另一方面，如果您确实想验证 XSD 本身，请参阅

xml xml xml xml xml xml xml xml-validation xsd xsd xsd xsd-validation

如何修复错误：cvc-elt.1：找不到没有命名空间的元素“xsd:schema”的声明？

问题描述

解决方法

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