问题
In a xsl:stylesheet I have this "identity like" transform, to eliminate comments, empty (terminal) tags and empty attributes... But the second xsl:when not works
<xsl:template match="node()">
<xsl:choose>
<xsl:when test="name()='p' and not(./*) and not(normalize-space(.))"></xsl:when>
<xsl:when test="not(name()='img') and not(name()='br') and not(./*) and not(text())"
></xsl:when> <!-- this line NOT WORKS -->
<xsl:otherwise><xsl:copy><xsl:apply-templates select="@*|node()"/></xsl:copy></xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template match="@*">
<xsl:choose>
<xsl:when test="not(normalize-space(.))"></xsl:when>
<xsl:otherwise><xsl:copy><xsl:apply-templates select="@*|node()"/></xsl:copy></xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template match="comment()"></xsl:template>
Whow to express condition to empty tags in this context?
PS: the "empty rules" are explained here, I try to use it, but not see why not working.
回答1:
An empty element is an element with no child nodes.
Template match priority is your friend ... the following should be the kind of identity stylesheet that meets your description plus what I think you are doing with image and break elements.
<?xml version="1.0" encoding="US-ASCII"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
<!--toss these-->
<xsl:template match="comment() |
*[not(node())] |
@*[not(normalize-space())]"/>
<!--preserve these-->
<xsl:template match="img|br" priority="1">
<xsl:call-template name="identity"/>
</xsl:template>
<!--preserve everything else-->
<xsl:template match="@*|node()" name="identity">
<xsl:copy>
<xsl:apply-templates select="@*|node()"/>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
来源：https://stackoverflow.com/questions/18025375/how-to-eliminate-all-tag-and-all-attribute-by-xslt