使用xslt样式表将xhtml空行转换为XSL-FO空行

问题描述

我使用XSLT样式表（Antennahouse）将XHTML转换为XSL-FO文件。我在我的XHTML文件中将空白行定义为2个连续的HTML BR标签。现在，对XSL-FO格式的空行没有本地支持。我想通过向样式表插入BR标记的fo：块添加高度来解决此限制。不过，我是XSLT语言的新手，我在做这件事时遇到了一些问题。

我可以计算出如何为每个遇到的BR标签插入这个高度，但我只希望在有两个BR标签之后插入空行（否则会在每个文本后面插入一个空白行，然后是BR标签。）

我做了一个无意义的表达式（11大于10 ），它将定义何时插入一个常规的fo：block或一个带有space-after =1em的fo：block。显然，这种表达方式没有意义，它应该检查的是BR元素是否是连续的第二个元素。如果有人能够帮助我，或者指引我朝着正确的方向发展，那么我将不胜感激。
这就是我现在的情况：

 ）的< br> ：* [1] ）本身是< br> （ [self :: html：br] ）： 
 
 
 < xsl：template match =html：br [following-sibling :: * [1] [自:: HTML：BR]]> 
< fo：block space-after =1em/> 
< / xsl：template> 
  
并扔掉那些< br> 直接在< br> 之前，以避免将空格加倍。通过将它们与空模板进行匹配，它们被实际删除： 
 
 
 < xsl：template match =html：br [ sibling :: * [1] [self :: html：br]]/> 
  
 
I'm using an XSLT stylesheet (by Antennahouse) to convert XHTML to an XSL-FO file. I defined a blank line in my XHTML file as 2 consecutive HTML BR tags. Now there is no native support for a blank line in the XSL-FO format. I want to work around this limitation by adding a height to the fo:block that the stylesheet inserts for a BR tag. However I'm new to the XSLT language and I'm having some problems doing this. 
I can figure out how to insert this height for every BR tag I encounter, but I only want the blank line to be inserted when there are 2 BR tags after each other (otherwise a blank line would be inserted after every text followed by a BR tag.)
I got as far as making a 'nonsense' expression (11 is greater than 10) which will define when to insert a regular fo:block or an fo:block with space-after="1em". Obviously this expression makes no sense, what it should check on is whether this BR element is the second one in a row. If anyone could help me out here or point me in the right direction, it would be greatly appreciated.This is what I have right now:
<xsl:template match="html:br">
<xsl:choose>
    <xsl:when test="11 &gt; 10">
        <fo:block space-after="1em">
            <xsl:call-template name="process-common-attributes"/>
        </fo:block>
    </xsl:when>
    <xsl:otherwise>
        <fo:block>
            <xsl:call-template name="process-common-attributes"/>
        </fo:block>
    </xsl:otherwise>
  </xsl:choose>
For reference sake, this is a piece of XHTML where I want the double BR tags to be transformed into a blank line, but the single BR tags should simply be a regular line break.
                  <div style="color: #000000; font-family: arial; font-size: 10pt; font-style: normal; font-weight: normal;">
                    <span>description</span>
                    <br/>
                    <span>using</span>
                    <br/>
                    <span>multiple</span>
                    <br/>
                    <span>lines</span>
                    <br/>
                    <br/>
                    <span>with</span>
                    <br/>
                    <br/>
                    <span>blank</span>
                    <br/>
                    <br/>
                    <span>lines</span>
                    <br/>
                </div>
 解决方案 
Something along the lines of this.
Match only those <br>s that are directly followed by an element (following-sibling::*[1]) that itself is a <br> ([self::html:br]):
<xsl:template match="html:br[following-sibling::*[1][self::html:br]]">
  <fo:block space-after="1em" />
</xsl:template>
and throw away those <br>s that are directly preceded by a <br>, to avoid doubling the space-after. By matching them with an empty template they are effectively deleted:
<xsl:template match="html:br[preceding-sibling::*[1][self::html:br]]" />
                        
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