XPath表达式

XPath表达式

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如何从一组XPath表达式生成XML文件？

本文介绍了如何从一组XPath表达式生成XML文件？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我希望能够在给定一组XPath映射的情况下生成完整的XML文件。

I want to be able to generate a complete XML file, given a set of XPath mappings.

输入可以在两个映射中指定：（1）一个列出XPath表达式和值; （2）定义适当名称空间的另一个。

The input could specified in two mappings: (1) One which lists the XPath expressions and values; and (2) the other which defines the appropriate namespaces.

/create/article[1]/id                 => 1
/create/article[1]/description        => bar
/create/article[1]/name[1]            => foo
/create/article[1]/price[1]/amount    => 00.00
/create/article[1]/price[1]/currency  => USD
/create/article[2]/id                 => 2
/create/article[2]/description        => some name
/create/article[2]/name[1]            => some description
/create/article[2]/price[1]/amount    => 00.01
/create/article[2]/price[1]/currency  => USD

对于名称空间：

/create               => xmlns:ns1='http://predic8.com/wsdl/material/ArticleService/1/
/create/article       => xmlns:ns1='http://predic8.com/material/1/‘
/create/article/price => xmlns:ns1='http://predic8.com/common/1/‘
/create/article/id    => xmlns:ns1='http://predic8.com/material/1/'

另请注意，同样重要的是我也要处理XPath 属性表达式。例如：我还应该能够处理属性，例如：

Note also, that it is important that I also deal with XPath Attributes expressions as well. For example: I should also be able to handle attributes, such as:

/create/article/@type => richtext

最终输出应如下所示：

<ns1:create xmlns:ns1='http://predic8.com/wsdl/material/ArticleService/1/'>
    <ns1:article xmlns:ns1='http://predic8.com/material/1/‘ type='richtext'>
        <name>foo</name>
        <description>bar</description>
        <ns1:price xmlns:ns1='http://predic8.com/common/1/'>
            <amount>00.00</amount>
            <currency>USD</currency>
        </ns1:price>
        <ns1:id xmlns:ns1='http://predic8.com/material/1/'>1</ns1:id>
    </ns1:article>
    <ns1:article xmlns:ns1='http://predic8.com/material/2/‘ type='richtext'>
        <name>some name</name>
        <description>some description</description>
        <ns1:price xmlns:ns1='http://predic8.com/common/2/'>
            <amount>00.01</amount>
            <currency>USD</currency>
        </ns1:price>
        <ns1:id xmlns:ns1='http://predic8.com/material/2/'>2</ns1:id>
    </ns1:article>
</ns1:create>

PS：这是对前一个：

This problem has an easy solution if one builds upon the solution of the previous problem:

<xsl:stylesheet version="2.0"
     xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
     xmlns:xs="http://www.w3.org/2001/XMLSchema"
     xmlns:my="my:my">
     <xsl:output omit-xml-declaration="yes" indent="yes"/>

     <xsl:key name="kNSFor" match="namespace" use="@of"/>
     <xsl:variable name="vStylesheet" select="document('')"/>

     <xsl:variable name="vPop" as="element()*">
        <item path="/create/article/@type">richtext</item>
        <item path="/create/article/@lang">en-us</item>
        <item path="/create/article[1]/id">1</item>
        <item path="/create/article[1]/description">bar</item>
        <item path="/create/article[1]/name[1]">foo</item>
        <item path="/create/article[1]/price[1]/amount">00.00</item>
        <item path="/create/article[1]/price[1]/currency">USD</item>
        <item path="/create/article[1]/price[2]/amount">11.11</item>
        <item path="/create/article[1]/price[2]/currency">AUD</item>
        <item path="/create/article[2]/id">2</item>
        <item path="/create/article[2]/description">some name</item>
        <item path="/create/article[2]/name[1]">some description</item>
        <item path="/create/article[2]/price[1]/amount">00.01</item>
        <item path="/create/article[2]/price[1]/currency">USD</item>

        <namespace of="create" prefix="ns1:"
                   url="http://predic8.com/wsdl/material/ArticleService/1/"/>
        <namespace of="article" prefix="ns1:"
                   url="xmlns:ns1='http://predic8.com/material/1/"/>
        <namespace of="@lang" prefix="xml:"
                   url="http://www.w3.org/XML/1998/namespace"/>
        <namespace of="price" prefix="ns1:"
                   url="xmlns:ns1='http://predic8.com/material/1/"/>
        <namespace of="id" prefix="ns1:"
                   url="xmlns:ns1='http://predic8.com/material/1/"/>
     </xsl:variable>

     <xsl:template match="/">
      <xsl:sequence select="my:subTree($vPop/@path/concat(.,'/',string(..)))"/>
     </xsl:template>

     <xsl:function name="my:subTree" as="node()*">
      <xsl:param name="pPaths" as="xs:string*"/>

      <xsl:for-each-group select="$pPaths" group-adjacent=
            "substring-before(substring-after(concat(., '/'), '/'), '/')">
        <xsl:if test="current-grouping-key()">
         <xsl:choose>
           <xsl:when test=
              "substring-after(current-group()[1], current-grouping-key())">

             <xsl:variable name="vLocal-name" select=
              "substring-before(concat(current-grouping-key(), '['), '[')"/>

             <xsl:variable name="vNamespace"
                           select="key('kNSFor', $vLocal-name, $vStylesheet)"/>


             <xsl:choose>
              <xsl:when test="starts-with($vLocal-name, '@')">
               <xsl:attribute name=
                 "{$vNamespace/@prefix}{substring($vLocal-name,2)}"
                    namespace="{$vNamespace/@url}">
                 <xsl:value-of select=
                  "substring(
                       substring-after(current-group(), current-grouping-key()),
                       2
                             )"/>
               </xsl:attribute>
              </xsl:when>
              <xsl:otherwise>
               <xsl:element name="{$vNamespace/@prefix}{$vLocal-name}"
                          namespace="{$vNamespace/@url}">

                    <xsl:sequence select=
                     "my:subTree(for $s in current-group()
                                  return
                                     concat('/',substring-after(substring($s, 2),'/'))
                                   )
                     "/>
                 </xsl:element>
              </xsl:otherwise>
             </xsl:choose>
           </xsl:when>
           <xsl:otherwise>
            <xsl:value-of select="current-grouping-key()"/>
           </xsl:otherwise>
         </xsl:choose>
         </xsl:if>
      </xsl:for-each-group>
     </xsl:function>
</xsl:stylesheet>

当此转换应用于任何XML文档（未使用）时，需要，正确结果生成：

<ns1:create xmlns:ns1="http://predic8.com/wsdl/material/ArticleService/1/">
   <ns1:article xmlns:ns1="xmlns:ns1='http://predic8.com/material/1/" type="richtext"
                xml:lang="en-us"/>
   <ns1:article xmlns:ns1="xmlns:ns1='http://predic8.com/material/1/">
      <ns1:id>1</ns1:id>
      <description>bar</description>
      <name>foo</name>
      <ns1:price>
         <amount>00.00</amount>
         <currency>USD</currency>
      </ns1:price>
      <ns1:price>
         <amount>11.11</amount>
         <currency>AUD</currency>
      </ns1:price>
   </ns1:article>
   <ns1:article xmlns:ns1="xmlns:ns1='http://predic8.com/material/1/">
      <ns1:id>2</ns1:id>
      <description>some name</description>
      <name>some description</name>
      <ns1:price>
         <amount>00.01</amount>
         <currency>USD</currency>
      </ns1:price>
   </ns1:article>
</ns1:create>

解释：


  1. 合理的假设是，在整个生成的文档中，任何具有相同 local-name（）的两个元素属于相同的命名空间 - 这涵盖了绝大多数真实的XML文档。

  1. A reasonable assumption is made that throughout the generated document any two elements with the same local-name() belong to the same namespace -- this covers the predominant majority of real-world XML documents.

命名空间规范遵循路径规范。 nsmespace规范的格式为：< namespace of =target element的local-nameprefix =wanted prefixurl =namespace-uri/>

The namespace specifications follow the path specifications. A nsmespace specification has the form: <namespace of="target element's local-name" prefix="wanted prefix" url="namespace-uri"/>

在使用 xsl：element 生成元素之前，使用由a创建的索引选择适当的命名空间规范。 的xsl：键。从此命名空间规范中，前缀和 url 属性的值用于指定 xsl：element 指示完整元素名称和元素名称空间-UR的值。

Before generating an element with xsl:element, the appropriate namespace specification is selected using an index created by an xsl:key. From this namespace specification the values of its prefix and url attributes are used in specifying in the xsl:element instruction the values of the full element name and the element's namespace-uri.

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08-28 10:59
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