如果 XML 文件具有不同名称空间中的元素，则使用 XMLTasks 的 ant 的 XMLPath 无法匹配

Question

我试图使用 XMLTasks 来替换 xml 文件中的某些值，但由于不匹配，它一直失败。使用其他工具它说我的 xpath 是正确的，但我无法弄清楚出了什么问题。

这是我正在搜索的文件：

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<project xmlns="http://www.netbeans.org/ns/project/1">
    <type>org.netbeans.modules.apisupport.project</type>
    <configuration>
        <data xmlns="http://www.netbeans.org/ns/nb-module-project/3">
            <code-name-base>simple.server.extension.cardgame</code-name-base>
            <suite-component/>
            <module-dependencies>
                <dependency>
                    <code-name-base>marauroa.lib</code-name-base>
                    <build-prerequisite/>
                    <compile-dependency/>
                    <run-dependency>
                        <release-version>3</release-version>
                        <specification-version>8</specification-version>
                    </run-dependency>
                </dependency>
                <dependency>
                    <code-name-base>simple.server.lib</code-name-base>
                    <build-prerequisite/>
                    <compile-dependency/>
                    <run-dependency>
                        <release-version>0-1</release-version>
                        <specification-version>0.2</specification-version>
                    </run-dependency>
                </dependency>
            </module-dependencies>
            <public-packages>
                <package>dreamer.card.game</package>
                <package>dreamer.card.game.model.events</package>
                <package>dreamer.card.game.price</package>
                <package>dreamer.card.game.storage</package>
                <package>simple.server.extension</package>
                <package>simple.server.extension.card</package>
            </public-packages>
            <class-path-extension>
                <runtime-relative-path>ext/extension/x.jar</runtime-relative-path>
                <binary-origin>../../Simple Marauroa Java/Card Game Extension/dist/x.jar</binary-origin>
            </class-path-extension>
            <class-path-extension>
                <runtime-relative-path>ext/extension/y.jar</runtime-relative-path>
                <binary-origin>../../Simple Marauroa Java/Card Game interface/dist/y.jar</binary-origin>
            </class-path-extension>
        </data>
    </configuration>
</project>

这是我正在使用的路径表达式：

/project/configuration/data/class-path-extension[1]/runtime-relative-path/text()

这是我尝试运行的任务的相关部分：

<target name="s" depends="-define-xmltasks">
        <propertyselector property="subprojects" match="original.project.dir(.*)" select="\1"/>
        <for list="${subprojects}" param="subproject">
            <sequential>
                <xmltask source="nbproject/project.xml" dest="nbproject/project.xml" failWithoutMatch="true">
                    <replace path="/project/configuration/data/class-path-extension[@{subproject}]/runtime-relative-path/text()" 
                             withText="ext/extension/${extension-lib@{subproject}.dist.jar}"/>
                    <replace path="/project/configuration/data/class-path-extension[@{subproject}]/binary-origin/text()" 
                             withText="${original.project.dir@{subproject}}/dist/${extension-lib@{subproject}.dist.jar}"/>
                </xmltask>
            </sequential>
        </for>
    </target>

@{subproject} 解析为一个数字，并且已经尝试将其更改为数字但具有相同的效果。有什么想法吗？

Answer 1

这是我正在使用的路径表达式：

/project/configuration/data/class-path-extension[1]/runtime-relative-path/text()

处理非空（默认）命名空间中的无前缀名称的一种方法是将名称指定为谓词。

这是以此样式编写的 XPath 表达式，用于选择所需的节点：

   /*[name()='project']
     /*[name()='configuration']
       /*[name()='data']
         /*[name()='class-path-extension'][1]
           /*[name()='runtime-relative-path']
             /text()

基于 XSLT 的验证：

<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output omit-xml-declaration="yes" indent="yes"/>

 <xsl:template match="/">
  <xsl:copy-of select=
  "/*[name()='project']
     /*[name()='configuration']
       /*[name()='data']
         /*[name()='class-path-extension'][1]
           /*[name()='runtime-relative-path']
             /text()
  "/>
 </xsl:template>
</xsl:stylesheet>

当此转换应用于提供的 XML 文档时：

<project xmlns="http://www.netbeans.org/ns/project/1">
    <type>org.netbeans.modules.apisupport.project</type>
    <configuration>
        <data xmlns="http://www.netbeans.org/ns/nb-module-project/3">
            <code-name-base>simple.server.extension.cardgame</code-name-base>
            <suite-component/>
            <module-dependencies>
                <dependency>
                    <code-name-base>marauroa.lib</code-name-base>
                    <build-prerequisite/>
                    <compile-dependency/>
                    <run-dependency>
                        <release-version>3</release-version>
                        <specification-version>8</specification-version>
                    </run-dependency>
                </dependency>
                <dependency>
                    <code-name-base>simple.server.lib</code-name-base>
                    <build-prerequisite/>
                    <compile-dependency/>
                    <run-dependency>
                        <release-version>0-1</release-version>
                        <specification-version>0.2</specification-version>
                    </run-dependency>
                </dependency>
            </module-dependencies>
            <public-packages>
                <package>dreamer.card.game</package>
                <package>dreamer.card.game.model.events</package>
                <package>dreamer.card.game.price</package>
                <package>dreamer.card.game.storage</package>
                <package>simple.server.extension</package>
                <package>simple.server.extension.card</package>
            </public-packages>
            <class-path-extension>
                <runtime-relative-path>ext/extension/x.jar</runtime-relative-path>
                <binary-origin>../../Simple Marauroa Java/Card Game Extension/dist/x.jar</binary-origin>
            </class-path-extension>
            <class-path-extension>
                <runtime-relative-path>ext/extension/y.jar</runtime-relative-path>
                <binary-origin>../../Simple Marauroa Java/Card Game interface/dist/y.jar</binary-origin>
            </class-path-extension>
        </data>
    </configuration>
</project>

计算 XPath 表达式并将所选节点复制到输出：

ext/extension/x.jar

注意：对于 XPath 表达式的增量构建和验证，您可以使用诸如作为<强>XPath 可视化工具。该工具已帮助成千上万的人以有趣的方式学习 XPath。

Answer 2

问题在于 project 和 data 元素是在不同的命名空间中声明的。您可以通过以下方式在节点谓词中使用 local-name() 属性：

/*[local-name() = 'project'] ...

您还可以指定使用 namespace-uri 属性的命名空间：

/*[local-name() = 'project' 和 namespace-uri() = 'http://www.netbeans.org/ns/ project/1'] ...

等等。