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Xslt XSl——需要转换方面的帮助吗

xslt select tags

Xslt XSl——需要转换方面的帮助吗,xslt,select,tags,repeat,Xslt,Select,Tags,Repeat,我是XSLT新手，正在尝试解决以下转换 我有一个XML，看起来像这样 <Groups> <Group> <GroupSelector>52</GroupSelector> <GroupDescription>Group 52</GroupDescription> <GroupValue>ABCD</GroupValue> </Group> <Group&g

我是XSLT新手，正在尝试解决以下转换

我有一个XML，看起来像这样

<Groups>
 <Group>
  <GroupSelector>52</GroupSelector> 
  <GroupDescription>Group 52</GroupDescription> 
    <GroupValue>ABCD</GroupValue> 
 </Group>
 <Group>
  <GroupSelector>27</GroupSelector> 
  <GroupDescription>Group 27</GroupDescription> 
  <GroupValue>PQRS</GroupValue> 
 </Group>
 <Group>
  <GroupSelector>20</GroupSelector> 
  <GroupDescription>Group 20</GroupDescription> 
  <GroupValue>XYZA</GroupValue> 
 </Group>
 <Group>
  <GroupSelector>15</GroupSelector> 
  <GroupDescription>Group 15</GroupDescription> 
  <GroupValue>MNOP</GroupValue> 
 </Group>
</Groups>


52
第52组
ABCD
27
第27组
PQRS
20
第20组
XYZA
15
第15组
MNOP
可能有0到n个“组”

我试图应用XSLT来查找“GroupSelector”值为20的“Group”，并创建如下输出：

<GroupSelection ElementName="FoundGroup" Missing="false">20</GroupSelection>
<GroupSelection ElementName="GroupDes" Missing="false">Group 20</GroupSelection>
<GroupSelection ElementName="GroupVal" Missing="false">XYZA</GroupSelection>

20
第20组
XYZA
如果n'组中没有一个具有值为20的'GroupSelector'，则输出应如此

<GroupSelection ElementName="FoundGroup" Missing="true"/>
<GroupSelection ElementName="GroupDes" Missing="true"/>
<GroupSelection ElementName="GroupVal" Missing="true"/>
请帮忙。提前谢谢

Lola

这个简单（简短，只有一个模板，没有模式，没有轴）和强大（参数化以使用任何可能的组Id）转换：

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

 <xsl:param name="pGroupId" select="'20'"/>

 <xsl:variable name="vGroup" select=
     "/*/Group[GroupSelector=$pGroupId]"/>

 <xsl:template match="/">
     <GroupSelection ElementName="FoundGroup"
                     Missing="{not($vGroup)}">
        <xsl:apply-templates select="$vGroup/GroupSelector"/>
     </GroupSelection>
     <GroupSelection ElementName="GroupDes"
                Missing="{not($vGroup)}">
        <xsl:apply-templates select="$vGroup/GroupDescription"/>
     </GroupSelection>
     <GroupSelection ElementName="GroupVal"
                     Missing="{not($vGroup)}">
        <xsl:apply-templates select="$vGroup/GroupValue"/>
     </GroupSelection>
 </xsl:template>
</xsl:stylesheet>

<Groups>
 <Group>
  <GroupSelector>52</GroupSelector>
  <GroupDescription>Group 52</GroupDescription>
    <GroupValue>ABCD</GroupValue>
 </Group>
 <Group>
  <GroupSelector>27</GroupSelector>
  <GroupDescription>Group 27</GroupDescription>
  <GroupValue>PQRS</GroupValue>
 </Group>
 <Group>
  <GroupSelector>20</GroupSelector>
  <GroupDescription>Group 20</GroupDescription>
  <GroupValue>XYZA</GroupValue>
 </Group>
 <Group>
  <GroupSelector>15</GroupSelector>
  <GroupDescription>Group 15</GroupDescription>
  <GroupValue>MNOP</GroupValue>
 </Group>
</Groups>

<GroupSelection ElementName="FoundGroup" Missing="false">20</GroupSelection>
<GroupSelection ElementName="GroupDes" Missing="false">Group 20</GroupSelection>
<GroupSelection ElementName="GroupVal" Missing="false">XYZA</GroupSelection>

  <GroupSelector>20</GroupSelector>

  <GroupSelector>21</GroupSelector>

<GroupSelection ElementName="FoundGroup" Missing="true"/>
<GroupSelection ElementName="GroupDes" Missing="true"/>
<GroupSelection ElementName="GroupVal" Missing="true"/>
应用于提供的XML文档时：

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

 <xsl:param name="pGroupId" select="'20'"/>

 <xsl:variable name="vGroup" select=
     "/*/Group[GroupSelector=$pGroupId]"/>

 <xsl:template match="/">
     <GroupSelection ElementName="FoundGroup"
                     Missing="{not($vGroup)}">
        <xsl:apply-templates select="$vGroup/GroupSelector"/>
     </GroupSelection>
     <GroupSelection ElementName="GroupDes"
                Missing="{not($vGroup)}">
        <xsl:apply-templates select="$vGroup/GroupDescription"/>
     </GroupSelection>
     <GroupSelection ElementName="GroupVal"
                     Missing="{not($vGroup)}">
        <xsl:apply-templates select="$vGroup/GroupValue"/>
     </GroupSelection>
 </xsl:template>
</xsl:stylesheet>

<Groups>
 <Group>
  <GroupSelector>52</GroupSelector>
  <GroupDescription>Group 52</GroupDescription>
    <GroupValue>ABCD</GroupValue>
 </Group>
 <Group>
  <GroupSelector>27</GroupSelector>
  <GroupDescription>Group 27</GroupDescription>
  <GroupValue>PQRS</GroupValue>
 </Group>
 <Group>
  <GroupSelector>20</GroupSelector>
  <GroupDescription>Group 20</GroupDescription>
  <GroupValue>XYZA</GroupValue>
 </Group>
 <Group>
  <GroupSelector>15</GroupSelector>
  <GroupDescription>Group 15</GroupDescription>
  <GroupValue>MNOP</GroupValue>
 </Group>
</Groups>

<GroupSelection ElementName="FoundGroup" Missing="false">20</GroupSelection>
<GroupSelection ElementName="GroupDes" Missing="false">Group 20</GroupSelection>
<GroupSelection ElementName="GroupVal" Missing="false">XYZA</GroupSelection>

  <GroupSelector>20</GroupSelector>

  <GroupSelector>21</GroupSelector>

<GroupSelection ElementName="FoundGroup" Missing="true"/>
<GroupSelection ElementName="GroupDes" Missing="true"/>
<GroupSelection ElementName="GroupVal" Missing="true"/>


52
第52组
ABCD
27
第27组
PQRS
20
第20组
XYZA
15
第15组
MNOP
生成所需的正确结果：

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

 <xsl:param name="pGroupId" select="'20'"/>

 <xsl:variable name="vGroup" select=
     "/*/Group[GroupSelector=$pGroupId]"/>

 <xsl:template match="/">
     <GroupSelection ElementName="FoundGroup"
                     Missing="{not($vGroup)}">
        <xsl:apply-templates select="$vGroup/GroupSelector"/>
     </GroupSelection>
     <GroupSelection ElementName="GroupDes"
                Missing="{not($vGroup)}">
        <xsl:apply-templates select="$vGroup/GroupDescription"/>
     </GroupSelection>
     <GroupSelection ElementName="GroupVal"
                     Missing="{not($vGroup)}">
        <xsl:apply-templates select="$vGroup/GroupValue"/>
     </GroupSelection>
 </xsl:template>
</xsl:stylesheet>

<Groups>
 <Group>
  <GroupSelector>52</GroupSelector>
  <GroupDescription>Group 52</GroupDescription>
    <GroupValue>ABCD</GroupValue>
 </Group>
 <Group>
  <GroupSelector>27</GroupSelector>
  <GroupDescription>Group 27</GroupDescription>
  <GroupValue>PQRS</GroupValue>
 </Group>
 <Group>
  <GroupSelector>20</GroupSelector>
  <GroupDescription>Group 20</GroupDescription>
  <GroupValue>XYZA</GroupValue>
 </Group>
 <Group>
  <GroupSelector>15</GroupSelector>
  <GroupDescription>Group 15</GroupDescription>
  <GroupValue>MNOP</GroupValue>
 </Group>
</Groups>

<GroupSelection ElementName="FoundGroup" Missing="false">20</GroupSelection>
<GroupSelection ElementName="GroupDes" Missing="false">Group 20</GroupSelection>
<GroupSelection ElementName="GroupVal" Missing="false">XYZA</GroupSelection>

  <GroupSelector>20</GroupSelector>

  <GroupSelector>21</GroupSelector>

<GroupSelection ElementName="FoundGroup" Missing="true"/>
<GroupSelection ElementName="GroupDes" Missing="true"/>
<GroupSelection ElementName="GroupVal" Missing="true"/>

20
第20组
XYZA
如果在上述文件中我们更改了：

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

 <xsl:param name="pGroupId" select="'20'"/>

 <xsl:variable name="vGroup" select=
     "/*/Group[GroupSelector=$pGroupId]"/>

 <xsl:template match="/">
     <GroupSelection ElementName="FoundGroup"
                     Missing="{not($vGroup)}">
        <xsl:apply-templates select="$vGroup/GroupSelector"/>
     </GroupSelection>
     <GroupSelection ElementName="GroupDes"
                Missing="{not($vGroup)}">
        <xsl:apply-templates select="$vGroup/GroupDescription"/>
     </GroupSelection>
     <GroupSelection ElementName="GroupVal"
                     Missing="{not($vGroup)}">
        <xsl:apply-templates select="$vGroup/GroupValue"/>
     </GroupSelection>
 </xsl:template>
</xsl:stylesheet>

<Groups>
 <Group>
  <GroupSelector>52</GroupSelector>
  <GroupDescription>Group 52</GroupDescription>
    <GroupValue>ABCD</GroupValue>
 </Group>
 <Group>
  <GroupSelector>27</GroupSelector>
  <GroupDescription>Group 27</GroupDescription>
  <GroupValue>PQRS</GroupValue>
 </Group>
 <Group>
  <GroupSelector>20</GroupSelector>
  <GroupDescription>Group 20</GroupDescription>
  <GroupValue>XYZA</GroupValue>
 </Group>
 <Group>
  <GroupSelector>15</GroupSelector>
  <GroupDescription>Group 15</GroupDescription>
  <GroupValue>MNOP</GroupValue>
 </Group>
</Groups>

<GroupSelection ElementName="FoundGroup" Missing="false">20</GroupSelection>
<GroupSelection ElementName="GroupDes" Missing="false">Group 20</GroupSelection>
<GroupSelection ElementName="GroupVal" Missing="false">XYZA</GroupSelection>

  <GroupSelector>20</GroupSelector>

  <GroupSelector>21</GroupSelector>

<GroupSelection ElementName="FoundGroup" Missing="true"/>
<GroupSelection ElementName="GroupDes" Missing="true"/>
<GroupSelection ElementName="GroupVal" Missing="true"/>

20
至：

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

 <xsl:param name="pGroupId" select="'20'"/>

 <xsl:variable name="vGroup" select=
     "/*/Group[GroupSelector=$pGroupId]"/>

 <xsl:template match="/">
     <GroupSelection ElementName="FoundGroup"
                     Missing="{not($vGroup)}">
        <xsl:apply-templates select="$vGroup/GroupSelector"/>
     </GroupSelection>
     <GroupSelection ElementName="GroupDes"
                Missing="{not($vGroup)}">
        <xsl:apply-templates select="$vGroup/GroupDescription"/>
     </GroupSelection>
     <GroupSelection ElementName="GroupVal"
                     Missing="{not($vGroup)}">
        <xsl:apply-templates select="$vGroup/GroupValue"/>
     </GroupSelection>
 </xsl:template>
</xsl:stylesheet>

<Groups>
 <Group>
  <GroupSelector>52</GroupSelector>
  <GroupDescription>Group 52</GroupDescription>
    <GroupValue>ABCD</GroupValue>
 </Group>
 <Group>
  <GroupSelector>27</GroupSelector>
  <GroupDescription>Group 27</GroupDescription>
  <GroupValue>PQRS</GroupValue>
 </Group>
 <Group>
  <GroupSelector>20</GroupSelector>
  <GroupDescription>Group 20</GroupDescription>
  <GroupValue>XYZA</GroupValue>
 </Group>
 <Group>
  <GroupSelector>15</GroupSelector>
  <GroupDescription>Group 15</GroupDescription>
  <GroupValue>MNOP</GroupValue>
 </Group>
</Groups>

<GroupSelection ElementName="FoundGroup" Missing="false">20</GroupSelection>
<GroupSelection ElementName="GroupDes" Missing="false">Group 20</GroupSelection>
<GroupSelection ElementName="GroupVal" Missing="false">XYZA</GroupSelection>

  <GroupSelector>20</GroupSelector>

  <GroupSelector>21</GroupSelector>

<GroupSelection ElementName="FoundGroup" Missing="true"/>
<GroupSelection ElementName="GroupDes" Missing="true"/>
<GroupSelection ElementName="GroupVal" Missing="true"/>

21
并对修改后的XML文档应用相同的转换，再次生成所需的正确结果：

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

 <xsl:param name="pGroupId" select="'20'"/>

 <xsl:variable name="vGroup" select=
     "/*/Group[GroupSelector=$pGroupId]"/>

 <xsl:template match="/">
     <GroupSelection ElementName="FoundGroup"
                     Missing="{not($vGroup)}">
        <xsl:apply-templates select="$vGroup/GroupSelector"/>
     </GroupSelection>
     <GroupSelection ElementName="GroupDes"
                Missing="{not($vGroup)}">
        <xsl:apply-templates select="$vGroup/GroupDescription"/>
     </GroupSelection>
     <GroupSelection ElementName="GroupVal"
                     Missing="{not($vGroup)}">
        <xsl:apply-templates select="$vGroup/GroupValue"/>
     </GroupSelection>
 </xsl:template>
</xsl:stylesheet>

<Groups>
 <Group>
  <GroupSelector>52</GroupSelector>
  <GroupDescription>Group 52</GroupDescription>
    <GroupValue>ABCD</GroupValue>
 </Group>
 <Group>
  <GroupSelector>27</GroupSelector>
  <GroupDescription>Group 27</GroupDescription>
  <GroupValue>PQRS</GroupValue>
 </Group>
 <Group>
  <GroupSelector>20</GroupSelector>
  <GroupDescription>Group 20</GroupDescription>
  <GroupValue>XYZA</GroupValue>
 </Group>
 <Group>
  <GroupSelector>15</GroupSelector>
  <GroupDescription>Group 15</GroupDescription>
  <GroupValue>MNOP</GroupValue>
 </Group>
</Groups>

<GroupSelection ElementName="FoundGroup" Missing="false">20</GroupSelection>
<GroupSelection ElementName="GroupDes" Missing="false">Group 20</GroupSelection>
<GroupSelection ElementName="GroupVal" Missing="false">XYZA</GroupSelection>

  <GroupSelector>20</GroupSelector>

  <GroupSelector>21</GroupSelector>

<GroupSelection ElementName="FoundGroup" Missing="true"/>
<GroupSelection ElementName="GroupDes" Missing="true"/>
<GroupSelection ElementName="GroupVal" Missing="true"/>
说明：使用：

  • AVT（属性值模板）

  • 文本节点的XSLT处理模型和内置模板

    • 如果不需要参数化转换，两个带文字结果元素的模板（不带AVT）就足够了：

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

    <xsl:template match="/*/Group[GroupSelector=20]">
        <GroupSelection ElementName="FoundGroup" Missing="false">
            <xsl:value-of select="GroupSelector"/>
        </GroupSelection>
        <GroupSelection ElementName="GroupDes" Missing="false">
            <xsl:value-of select="GroupDescription"/>
        </GroupSelection>
        <GroupSelection ElementName="GroupVal" Missing="false">
            <xsl:value-of select="GroupValue"/>
        </GroupSelection>
    </xsl:template>

    <xsl:template match="/*/Group[
        not(following::Group)
        and not(preceding::Group[GroupSelector=20])
        and not(GroupSelector=20)]">
        <GroupSelection ElementName="FoundGroup" Missing="true"/>
        <GroupSelection ElementName="GroupDes" Missing="true"/>
        <GroupSelection ElementName="GroupVal" Missing="true"/>
    </xsl:template>

</xsl:stylesheet>
    否则，如果组选择是可变的（您需要参数化变换），则可以使用有用的模板模式模式来适应上述解决方案：

    <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
    <xsl:output indent="yes"/>
    <xsl:strip-space elements="*"/>
    <xsl:param name="selector" select="20"/>

    <xsl:template match="/*/Group">
        <xsl:apply-templates select="self::*[GroupSelector=$selector]" 
            mode="selection"/>
        <xsl:apply-templates select="self::*[
            not(following::Group)
            and not(preceding::Group[GroupSelector=$selector])
            and not(GroupSelector=$selector)]" 
            mode="noselection"/>
    </xsl:template>

    <xsl:template match="Group" mode="selection">
        <GroupSelection ElementName="FoundGroup" Missing="false">
            <xsl:value-of select="GroupSelector"/>
        </GroupSelection>
        <GroupSelection ElementName="GroupDes" Missing="false">
            <xsl:value-of select="GroupDescription"/>
        </GroupSelection>
        <GroupSelection ElementName="GroupVal" Missing="false">
            <xsl:value-of select="GroupValue"/>
        </GroupSelection>
    </xsl:template>

    <xsl:template match="Group" mode="noselection">
        <GroupSelection ElementName="FoundGroup" Missing="true"/>
        <GroupSelection ElementName="GroupDes" Missing="true"/>
        <GroupSelection ElementName="GroupVal" Missing="true"/>
    </xsl:template>

</xsl:stylesheet>
    显然，在XSLT 2.0中，您可以直接使用变量，并编写如下内容：

    <xsl:template match="/*/Group[GroupSelector=$selector]">
    这样事情就简单了。

    好问题，+1。请参阅我的答案，以获得简短、简单的解决方案。：）为什么有人要使用这样的冗余代码？不仅浪费空间，而且维护性也有问题。@Dimitre我在这里不关心可重用性。关于空间，它使用的空间并不比模板中的空间多。我增加了可读性。你一定很困惑，@empo，说你“增加了可读性”，有一个复杂的表达式，有不同的轴，3个模板和两个不同的模式，…，还有很多重复/冗余的代码…@Dimitre不知道复杂的表达式在哪里：PIt很明显，你没有看到这个，@empoIn我的拙见，不值得将答案本身复杂化，只是为了使重用几个文字元素成为可能。只需注意，这里的错误缩进使您的答案很难理解。@empo：为什么您认为比您的答案短两倍的解决方案是“复杂的”？：）对不起，我不懂强音的用法。还有点令人不安：）