Question

我正在尝试使用XSL进行一对多映射，而我似乎陷入困境。

我有一个名为Channel的父标记结构，它由1对多的Framework标记组成。每个框架标签又可以由1对多的后端标签组成。这是我的源XML。

    <ESBConfig>
    <Channels>
        <Channel ChannelId="SMS">
            <Name>SMS Banking</Name>
            <dependentFrameworks>
                <FW FrameworkRef="FW001">This is to call FW001</FW>
                <FW FrameworkRef="FW002">This is to call FW002</FW>
            </dependentFrameworks>
        </Channel>
        <Channel ChannelId="IBK">
            <Name>Internet Banking</Name>
            <dependentFrameworks>
                <FW FrameworkRef="FW001">This is to call FW001</FW>
                <FW FrameworkRef="FW002">This is to call FW002</FW>
            </dependentFrameworks>
        </Channel>
    </Channels>
    <Frameworks>
        <Framework FrameworkId="FW001">
            <Name>Framework 001</Name>
            <dependentBackends>
                <BE BackendRef="BED001">This is to call BED001</BE>
                <BE BackendRef="BED002">This is to call BED002</BE>
            </dependentBackends>
        </Framework>
        <Framework FrameworkId="FW002">
            <Name>Framework 002</Name>
            <dependentBackends>
                <BE BackendRef="BED001">This is to call BED001</BE>
                <BE BackendRef="BED002">This is to call BED002</BE>
            </dependentBackends>
        </Framework>
    </Frameworks>
    <Backends>
        <Backend BackendId="BED001">
            <Name>Backend 1</Name>
        </Backend>
        <Backend BackendId="BED002">
            <Name>Backend 2</Name>
        </Backend>
    </Backends>
</ESBConfig>

在我的XSL中，我使用的是apply-templates和xsl调用模板。但我因为一对多的关系而无法穿越树。这是我想构建的目标XML。

<ESBConfig>
    <Channel ChannelId="SMS">
        <Name>SMS Banking</Name>
        <dependentFrameworks>
            <Framework FrameworkId="FW001">
                <Name>Framework 1</Name>
                <dependentBackends>
                    <Backend BackendId="BED001">
                        <Name>Backend 1</Name>
                    </Backend>
                    <Backend BackendId="BED002">
                        <Name>Backend 2</Name>
                    </Backend>
                </dependentBackends>
            </Framework>
            <Framework FrameworkId="FW002">
                <Name>Framework 2</Name>
                <dependentBackends>
                    <Backend BackendId="BED001">
                        <Name>Backend 1</Name>
                    </Backend>
                    <Backend BackendId="BED002">
                        <Name>Backend 2</Name>
                    </Backend>
                </dependentBackends>
            </Framework>
        </dependentFrameworks>
    </Channel>
</ESBConfig>

这是我到目前为止使用的代码，但我无法迭代给定框架ID的后端数量。任何指针都表示赞赏。感谢

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:template match="ESBConfig">
        <xsl:variable name="channelName">
            <xsl:value-of select="'SMS'"/>
        </xsl:variable>
        <xsl:variable name="frameworkRef">
            <xsl:value-of select="/ESBConfig/Channels/Channel[@ChannelId=$channelName]/dependentFrameworks/FW/@FrameworkRef"/>
        </xsl:variable>
        <xsl:variable name="backendRef">
            <xsl:value-of select="/ESBConfig/Frameworks/Framework[@FrameworkId=$frameworkRef]/dependentBackends/BE/@BackendRef"/>
        </xsl:variable>
        <tr>
            <Level2>
                <xsl:element name="channelName">
                    <xsl:value-of select="$channelName"/>
                </xsl:element>
                <channelName>
                    <xsl:value-of select="'SMS'"/>
                </channelName>
            </Level2>
            <Level1>
                <xsl:element name="frameworkRef">
                    <xsl:value-of select="$frameworkRef"/>
                </xsl:element>
                <framework>
                    <xsl:copy-of select="/ESBConfig/Frameworks/Framework[@FrameworkId=$frameworkRef]"/>
                </framework>
            </Level1>
            <Level0>
                <xsl:variable name="snippet">
                    <xsl:copy-of select="/ESBConfig/Frameworks/Framework[@FrameworkId=$frameworkRef]/dependentBackends/BE"/>
                </xsl:variable>
                <xsl:for-each select="$snippet/BE">
                    <xsl:variable name="temp">
                        <xsl:value-of select="@BackendRef"/>
                    </xsl:variable>
                    <Bref>
                        <xsl:value-of select="$temp"/>
                    </Bref>
                </xsl:for-each>
            </Level0>
        </tr>
    </xsl:template>
    <xsl:template match="/ESBConfig/Backends">
        <xsl:param name="bid"/>
        <xsl:copy-of select="Backend[@BackendId=$bid]"/>
    </xsl:template>
</xsl:stylesheet>

Answer 1

使用两个键，第一个键是<xsl:key name="fw" match="Framework" use="@FrameworkId"/>，然后在与Channel匹配的模板中使用它来处理<xsl:apply-templates select="key('fw', dependentFramework/Framework/@FrameworkRef)"/>。您可以使用相同的方法来遵循其他交叉引用。

Answer 2

这是Martin Honnen谈论的方法的一个例子。它与您的示例XSLT（创建tr＆{39}和Level#元素）有很大不同，但匹配所需的输出*。

*输出包含所有Channel个元素和Channels包装元素，其中请求的输出仅包含SMS个通道。如果您需要将输出限制为单个频道，我建议您在选择中为xsl:param添加Channel和谓词。如果您想要更新的示例，请与我们联系。

XML输入

<ESBConfig>
    <Channels>
        <Channel ChannelId="SMS">
            <Name>SMS Banking</Name>
            <dependentFrameworks>
                <FW FrameworkRef="FW001">This is to call FW001</FW>
                <FW FrameworkRef="FW002">This is to call FW002</FW>
            </dependentFrameworks>
        </Channel>
        <Channel ChannelId="IBK">
            <Name>Internet Banking</Name>
            <dependentFrameworks>
                <FW FrameworkRef="FW001">This is to call FW001</FW>
                <FW FrameworkRef="FW002">This is to call FW002</FW>
            </dependentFrameworks>
        </Channel>
    </Channels>
    <Frameworks>
        <Framework FrameworkId="FW001">
            <Name>Framework 001</Name>
            <dependentBackends>
                <BE BackendRef="BED001">This is to call BED001</BE>
                <BE BackendRef="BED002">This is to call BED002</BE>
            </dependentBackends>
        </Framework>
        <Framework FrameworkId="FW002">
            <Name>Framework 002</Name>
            <dependentBackends>
                <BE BackendRef="BED001">This is to call BED001</BE>
                <BE BackendRef="BED002">This is to call BED002</BE>
            </dependentBackends>
        </Framework>
    </Frameworks>
    <Backends>
        <Backend BackendId="BED001">
            <Name>Backend 1</Name>
        </Backend>
        <Backend BackendId="BED002">
            <Name>Backend 2</Name>
        </Backend>
    </Backends>
</ESBConfig>

XSLT 1.0

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:output indent="yes"/>
    <xsl:strip-space elements="*"/>

    <xsl:key name="frameworks" match="Framework" use="@FrameworkId"/>
    <xsl:key name="backends" match="Backend" use="@BackendId"/>

    <xsl:template match="@*|node()">
        <xsl:copy>
            <xsl:apply-templates select="@*|node()"/>
        </xsl:copy>
    </xsl:template>

    <xsl:template match="/*">
        <xsl:copy>
            <xsl:apply-templates select="@*|Channels"/>
        </xsl:copy>
    </xsl:template>

    <xsl:template match="FW">
        <xsl:apply-templates select="key('frameworks',@FrameworkRef)"/>
    </xsl:template>

    <xsl:template match="BE">
        <xsl:apply-templates select="key('backends',@BackendRef)"/>
    </xsl:template>

</xsl:stylesheet>

XML输出

<ESBConfig>
   <Channels>
      <Channel ChannelId="SMS">
         <Name>SMS Banking</Name>
         <dependentFrameworks>
            <Framework FrameworkId="FW001">
               <Name>Framework 001</Name>
               <dependentBackends>
                  <Backend BackendId="BED001">
                     <Name>Backend 1</Name>
                  </Backend>
                  <Backend BackendId="BED002">
                     <Name>Backend 2</Name>
                  </Backend>
               </dependentBackends>
            </Framework>
            <Framework FrameworkId="FW002">
               <Name>Framework 002</Name>
               <dependentBackends>
                  <Backend BackendId="BED001">
                     <Name>Backend 1</Name>
                  </Backend>
                  <Backend BackendId="BED002">
                     <Name>Backend 2</Name>
                  </Backend>
               </dependentBackends>
            </Framework>
         </dependentFrameworks>
      </Channel>
      <Channel ChannelId="IBK">
         <Name>Internet Banking</Name>
         <dependentFrameworks>
            <Framework FrameworkId="FW001">
               <Name>Framework 001</Name>
               <dependentBackends>
                  <Backend BackendId="BED001">
                     <Name>Backend 1</Name>
                  </Backend>
                  <Backend BackendId="BED002">
                     <Name>Backend 2</Name>
                  </Backend>
               </dependentBackends>
            </Framework>
            <Framework FrameworkId="FW002">
               <Name>Framework 002</Name>
               <dependentBackends>
                  <Backend BackendId="BED001">
                     <Name>Backend 1</Name>
                  </Backend>
                  <Backend BackendId="BED002">
                     <Name>Backend 2</Name>
                  </Backend>
               </dependentBackends>
            </Framework>
         </dependentFrameworks>
      </Channel>
   </Channels>
</ESBConfig>

Answer 3

您可以使用标签。例如：

<xsl:for-each select="Channel">
    <!-- Your code here -->
</xsl:for-each>

for-each的工作原理与任何其他编程语言一样：它选择select属性中Tag的每个出现位置，然后为每个属性执行以下操作。

使用xsl-apply模板进行一对多映射

3 个答案: