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xslt - 合并多个 xml 文件时，如何为子 xml 文件以及父 xml 设置 EntityResolver？

问题描述

我有一个引用其他多个 xml 文件的书 xml 文件。当我尝试在 book.xml 文件上运行 xslt 时，我的代码中的 EntityResolver 解析了 dtd 路径。但是，对于正在合并的子 xml 文件，不会解析 dtd 路径。

示例 sample_book.ditamap

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE bookmap PUBLIC "-//OASIS//DTD DITA BookMap//EN" "bookmap.dtd">
<bookmap>
    <booktitle>
        <mainbooktitle>sample book</mainbooktitle>
    </booktitle>
    <part navtitle="Overview">
        <topicref href="../topics/introduction.dita"/>
        <topicref href="../topics/install.dita"/>
    </part>
</bookmap>

`

Java 代码

public class XMLProcessor  {

       public void transform(String xmlf, String xslf) throws TransformerConfigurationException, TransformerException, org.xml.sax.SAXException, IOException{

        org.xml.sax.XMLReader reader = XMLReaderFactory.createXMLReader();
        Transformer transformer;
        TransformerFactory factory = TransformerFactory.newInstance();

         StreamSource stylesheet = new StreamSource(xslf);

         //Source source = StreamSource(xmlf);
         //SAXSource source = new SAXSource(new InputSource(xmlf));
        // org.xml.sax.XMLReader reader = XMLReaderFactory.createXMLReader();

         EntityResolver ent = new EntityResolver() {

            @Override
            public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException {

                System.out.println(publicId);
                System.out.println(systemId);

                if(publicId.equals("-//OASIS//DTD DITA BookMap//EN")){
                    return new InputSource("file:///D:/sample/dtd/bookmap.dtd");
                }

                return null;
                }
            };
        // sour.setPublicId("file:///D:/sample/dtd/bookmap/dtd/bookmap.dtd");


            reader.setEntityResolver(ent);
            SAXSource source = new SAXSource(reader, new InputSource(xmlf));
            //reader.parse(new InputSource(xmlf));
         //StreamSource sourcedoc = new StreamSource(xmlf);
         transformer = factory.newTransformer(stylesheet);

        try {
            transformer.transform(source, new StreamResult(new FileWriter("D:\\sample\\out\\result.xml")));
        } catch (IOException ex) {
            Logger.getLogger(XMLProcessor.class.getName()).log(Level.SEVERE, null, ex);
        }

    }





}`

预期结果

`

<?xml version="1.0" encoding="UTF-8"?>
<pages xmlns:mf="urn:mf">
    <parentpage>
        <parentpagename>sample book</parentpagename>
    </parentpage>
    <part>
        <partname>Overview</partname>
        <text/>
        <level-2>
            <concept xmlns:ditaarch="http://dita.oasis-open.org/architecture/2005/"
                id="introduction" ditaarch:DITAArchVersion="1.3"
                domains="(topic concept)                            (topic abbrev-d)                            a(props deliveryTarget)                            (topic equation-d)                            (topic hazard-d)                            (topic hi-d)                            (topic indexing-d)                            (topic markup-d)                            (topic mathml-d)                            (topic pr-d)                            (topic relmgmt-d)                            (topic sw-d)                            (topic svg-d)                            (topic ui-d)                            (topic ut-d)                            (topic markup-d xml-d)   "
                class="- topic/topic concept/concept ">
                <title class="- topic/title ">Introduction</title>
                <shortdesc class="- topic/shortdesc "/>
                <conbody class="- topic/body  concept/conbody ">
                    <p class="- topic/p ">Sample introduction</p>
                </conbody>
            </concept>
        </level-2>
        <text/>
        <level-2>
            <task xmlns:ditaarch="http://dita.oasis-open.org/architecture/2005/" id="install"
                ditaarch:DITAArchVersion="1.3"
                domains="(topic task)                            (topic abbrev-d)                            a(props deliveryTarget)                            (topic equation-d)                            (topic hazard-d)                            (topic hi-d)                            (topic indexing-d)                            (topic markup-d)                            (topic mathml-d)                            (topic pr-d)                            (topic relmgmt-d)                            (topic sw-d)                            (topic svg-d)                            (topic ui-d)                            (topic ut-d)                            (topic markup-d xml-d)                            (topic task strictTaskbody-c)   "
                class="- topic/topic task/task ">
                <title class="- topic/title ">Install</title>
                <shortdesc class="- topic/shortdesc "/>
                <taskbody class="- topic/body task/taskbody ">
                    <context class="- topic/section task/context ">
                        <p class="- topic/p ">Download xyz installer from here. </p>
                    </context>
                    <steps class="- topic/ol task/steps ">
                        <step class="- topic/li task/step ">
                            <cmd class="- topic/ph task/cmd ">Double-click the downloader
                                installer.</cmd>
                        </step>
                        <step class="- topic/li task/step ">
                            <cmd class="- topic/ph task/cmd ">Do this.</cmd>
                        </step>
                        <step class="- topic/li task/step ">
                            <cmd class="- topic/ph task/cmd ">Do that</cmd>
                        </step>
                    </steps>
                </taskbody>
            </task>
        </level-2>
    </part>
</pages>

`

实际结果

运行 XSLT 时，将显示以下错误消息。当我将 dtd 文件移动到主题文件夹时，错误消失了。

Warning   XTDE0540: Ambiguous rule match for /bookmap/booktitle[1] Matches both "element(Q{}booktitle)" on line 54 of
>file:///D:/sample/xsl/merge.xsl and "element(Q{}booktitle)" on line 18 of >file:///D:/sample/xsl/merge.xsl Warning at char 11 in

xsl:apply-templates/@select on line 30 column 104 of >merge.xsl: FODC0002: I/O error reporting by XML parser processing file:/D:/sample/sampledoc/topics/introduction.dita: D:\sample \sampledoc\topics\concept.dtd（系统找不到

文件指定）在 xsl:apply-templates/@select 的第 30 行第 104 行的 >merge.xsl: FODC0002: I/O 错误报告的 XML 解析器处理文件中报告的 I/O 错误：/D:/sample/sampledoc/topics/ install.dita: D:\sample\sampledoc\topics\task.dtd （系统找不到指定的>文件）

标签： xsltentityresolver

解决方案

您可以在 Transformer 上设置一个 URIResolver，当您的 XSLT 代码调用 doc() 或 document() 以获取引用的 XML 文件时，将调用该 URIResolver。然后，URIResolver 可以在用于解析这些文件的 XML 解析器上设置一个 EntityResolver。

或者，您可以使用 Apache XMLResolver 来完成所有这些工作，它通过引用 OASIS 定义的格式的目录文件来在 XSLT 和 XML 级别引用 URI。

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