Question

我正在尝试使用相同的XPath替换从另一个文档中选择的节点替换一个文档中的节点。我正在使用Saxon XPath选择器从两个文档中选择节点，但我没有找到关于如何替换节点的任何线索。

说我的XPath是：/ bookstore / book以下是我到目前为止从源文档和目标文档访问节点的一段代码。

Processor SaxonProcessor = new Processor();
XPathCompiler Compiler = SaxonProcessor.NewXPathCompiler();

XmlDocument xmlDocumentTarget = new XmlDocument();
xmlDocumentTarget.LoadXml(targetXml);

DocumentBuilder sBuilder = SaxonProcessor.NewDocumentBuilder();
var sourceNode = sBuilder.Wrap(xmlDocumentSource);

XmlDocument xmlDocumentTarget = new XmlDocument();
xmlDocumentTarget.LoadXml(targetXml);

DocumentBuilder sBuilder = SaxonProcessor.NewDocumentBuilder();
var sourceDoc = sBuilder.Wrap(xmlDocumentSource);

DocumentBuilder tBuilder = SaxonProcessor.NewDocumentBuilder();
var targetDoc = tBuilder.Wrap(xmlDocumentTarget);

string xPath = @"/bookstore/book";
var sourceExp = Compiler.Compile(xPath).Load();
sourceExp.ContextItem = sourceDoc;

var targetExp = Compiler.Compile(xPath).Load();
targetExp.ContextItem = targetDoc;

var sourceXdmValue = sourceExp.Evaluate(); // Gives me source nodes
var targetXdmValue = targetExp.Evaluate(); // Gives me target nodes to replace

现在我想从源文档中的节点替换目标文档中的节点。我怎么能用Saxon API做到这一点？

请注意，在目标文档中，不包含带有“my”命名空间的书籍，因为不会根据提供的XPath从源中选择。

源XML

<bookstore specialty="novel">
  <book style="autobiography">
    <author>
      <first-name>Joe</first-name>
      <last-name>Bob</last-name>
      <award>Trenton Literary Review Honorable Mention</award>
    </author>
    <price>12</price>
  </book>
  <book style="textbook">
    <author>
      <first-name>Mary</first-name>
      <last-name>Bob</last-name>
      <publication>Selected Short Stories of
        <first-name>Mary</first-name>
        <last-name>Bob</last-name>
      </publication>
    </author>
    <editor>
      <first-name>Britney</first-name>
      <last-name>Bob</last-name>
    </editor>
    <price>55</price>
  </book>
  <book style="novel" id="myfave">
    <author>
      <first-name>Toni</first-name>
      <last-name>Bob</last-name>
      <degree from="Trenton U">B.A.</degree>
      <degree from="Harvard">Ph.D.</degree>
      <award>Pulitzer</award>
      <publication>Still in Trenton</publication>
      <publication>Trenton Forever</publication>
    </author>
    <price intl="Canada" exchange="0.7">6.50</price>
    <excerpt>
      <p>It was a dark and stormy night.</p>
      <p>But then all nights in Trenton seem dark and
      stormy to someone who has gone through what
      <emph>I</emph> have.</p>
      <definition-list>
        <term>Trenton</term>
        <definition>misery</definition>
      </definition-list>
    </excerpt>
  </book>
  <my:book xmlns:my="uri:mynamespace" style="leather" price="29.50">
    <my:title>Who's Who in Trenton</my:title>
    <my:author>Robert Bob</my:author>
  </my:book>
</bookstore>

目标XML

<bookstore specialty="novel">
  <book style="History">
    <author>
      <first-name>Joe</first-name>
      <last-name>Bob</last-name>
      <award>Trenton Literary Review Honorable Mention</award>
    </author>
    <price>12</price>
  </book>
</bookstore>

结果XML

<bookstore specialty="novel">
  <book style="autobiography">
    <author>
      <first-name>Joe</first-name>
      <last-name>Bob</last-name>
      <award>Trenton Literary Review Honorable Mention</award>
    </author>
    <price>12</price>
  </book>
  <book style="textbook">
    <author>
      <first-name>Mary</first-name>
      <last-name>Bob</last-name>
      <publication>Selected Short Stories of
        <first-name>Mary</first-name>
        <last-name>Bob</last-name>
      </publication>
    </author>
    <editor>
      <first-name>Britney</first-name>
      <last-name>Bob</last-name>
    </editor>
    <price>55</price>
  </book>
  <book style="novel" id="myfave">
    <author>
      <first-name>Toni</first-name>
      <last-name>Bob</last-name>
      <degree from="Trenton U">B.A.</degree>
      <degree from="Harvard">Ph.D.</degree>
      <award>Pulitzer</award>
      <publication>Still in Trenton</publication>
      <publication>Trenton Forever</publication>
    </author>
    <price intl="Canada" exchange="0.7">6.50</price>
    <excerpt>
      <p>It was a dark and stormy night.</p>
      <p>But then all nights in Trenton seem dark and
      stormy to someone who has gone through what
      <emph>I</emph> have.</p>
      <definition-list>
        <term>Trenton</term>
        <definition>misery</definition>
      </definition-list>
    </excerpt>
  </book>
</bookstore>

Answer 1

我不确定您的简单XPath表达式需要Saxon和XPath 2.0，我不确定您是否真的要删除目标中选择的所有元素，然后只需将源中选择的元素作为{的子元素插入{1}}但Saxon和.NET的DOM API混合使用

&page=2

但是，我同意在XSLT 2.0中这样做似乎是更好的方法，因为你已经使用了Saxon。

Answer 2

基本答案是“解包”XPath表达式返回的XdmNode值以获取底层DOM节点，然后使用DOM接口修改底层的XmlDocument实例。所以你根本就没有使用Saxon API。

但就个人而言，我会以不同的方式解决这个问题：我会在XSLT转型中完成所有工作。

我担心我不能给你实际代码，因为我不理解你的逻辑。为什么结果文档包含“源”中的所有书籍和杂志元素，而不包括my：book元素，而“目标”中没有任何内容？

使用XPath - Saxon .net API替换从另一个文档中选择的一个xml文档的节点

源XML

目标XML

结果XML

2 个答案: