XML：检查两个节点之间是否存在任何内容

I need to find out if anything exists between two nodes. My XML looks like this:

我需要找出两个节点之间是否存在任何问题。我的XML看起来像这样:

<event value1="1" value2="2" value3="3" info="some info here">
          Line 1.<lb/>
          Line 2.<lb/><lb/>
          Line 3.<lb/>
          Line 4.<lb/>
</event>

My goal is to convert the <lb/> nodes to   HTML tags using XSLT. There is one additional requirement to fulfill though. In case there is one <lb/> directly following another <lb/> I want to output only one  .

我的目标是使用XSLT将节点转换为HTML标签。但是还有一个额外的要求。如果有一个直接跟在另一个之后,我想只输出一个。

My XSLT looks like this:

我的XSLT看起来像这样:

 <xsl:template match="lb">
    <xsl:if test="not(preceding-sibling::lb[1])">
       <br/>
    </xsl:if>
 </xsl:template>

The problem with the XSLT above is that it works correctly for line 1 only as the text between both nodes is ignored.

上面的XSLT的问题在于它仅对第1行正常工作,因为忽略了两个节点之间的文本。

Maybe someone here can help.

也许有人可以提供帮助。

3 个解决方案

#1

Edit: Another, more efficient way is this:

编辑:另一种更有效的方法是:

<xsl:template match="lb">
    <xsl:if test="following-sibling::node()[1][not(self::lb)]">
        <br/>
    </xsl:if>
</xsl:template>

Try this:

 <xsl:template match="lb">
   <xsl:if test="generate-id()=generate-id(preceding-sibling::text()[1]/following-sibling::lb[1])">
     <br/>
   </xsl:if>
 </xsl:template>

Basically this checks if you are on the first <lb/> the previous text sibling node, which also means that it will only add   after some text, but not if the <lb/> are at the beginning of the parent tag.

基本上这会检查你是否在前一个文本兄弟节点的第一个上,这也意味着它只会在一些文本之后添加
,但如果位于父节点的开头则不会标签。

#2

You are looking for something along the lines of this:

您正在寻找以下内容:

<!-- per default, <lb> gets removed (empty template)... -->
<xsl:template match="lb" />

<!-- ...unless it is directly preceded by a non-blank text node -->
<xsl:template match="lb[
  normalize-space(preceding-sibling::node()[1][self::text()]) != ''
]">
  <br />
</xsl:template>

This handles any arbitrary number of <lb/> nodes that may occur consecutively.

这可以处理可能连续发生的任意数量的节点。

Behavior for <lb/> nodes that follow an element (not a text node) must still be defined. Currently they would be deleted. If you want to keep them, write an appropriate template for them.

仍然必须定义跟随元素(不是文本节点)的节点的行为。目前他们将被删除。如果您想保留它们,请为它们编写适当的模板。

#3

This transformation:

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

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

 <xsl:template match="lb"/>

 <xsl:template match=
  "lb[not(following-sibling::node()[1][self::lb])]">
  <br />
 </xsl:template>
</xsl:stylesheet>

when applied on the provided XML document:

当应用于提供的XML文档时:

<event value1="1" value2="2" value3="3" info="some info here">
          Line 1.<lb/>
          Line 2.<lb/><lb/>
          Line 3.<lb/>
          Line 4.<lb/>
</event>

produces the wanted result:

产生想要的结果:

<event value1="1" value2="2" value3="3" info="some info here">
          Line 1.<br/>
          Line 2.<br/>
          Line 3.<br/>
          Line 4.<br/>
</event>

Do note:

The use and overriding of the identity transform.

身份变换的使用和覆盖。
How <lb> elements are deleted by default.

默认情况下如何删除元素。
How only the last <lb> element in a group of adjacent sibling <lb> nodes is processed in a more special way -- is replaced by a   element.

如何以更特殊的方式处理一组相邻兄弟节点中的最后一个元素 - 由
元素替换。

#1