How to comment in XSLT and not HTML

I'm writing XSL and I want to make comments throughout the code that will be stripped when it's processed, like PHP, howeve开发者_开发问答r I'm not sure how.

I'm aware of the comment object, but it prints out an HTML comment when processed. :\

<xsl:comment>comment</xsl:comment>

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You use standard XML comments:

<!-- Comment -->

These are not processed by the XSLT transformer.

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Just make sure that you put your <!-- comments --> AFTER the opening XML declaration (if you use one, which you really don't need):

BREAKS:

<!-- a comment -->
<?xml version="1.0"?>

WORKS:

<?xml version="1.0"?>
<!-- a comment -->

I scratched my head on this same issue for a bit while debugging someone else's XSLT... seems obvious, but easily overlooked.

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Note that white space on either side of the comments can end up in the output stream, depending on your XSLT processor and its settings for handling white-space. If this is an issue for your output, make sure the comment is bracketed by xslt tags.

EG

<xsl:for-each select="someTag">
  <xsl:text>"</xsl:text>
    <!-- output the id -->
<xsl:value-of select="@id"/>
<xsl:text>"</xsl:text>
</xsl:for-each>

Will output " someTagID" (the indent tab/spaces in front of the comment tag are output). To remove, either unindent it flush with left margin, or bracket it like

<xsl:text>"</xsl:text><!-- output the id --><xsl:value-of select="@id"/>

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This is the way to do it in order to create a comment node that won't be displayed in html

<xsl:comment>

  <!-- Content:template -->

</xsl:comment>

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Sure. Read http://www.w3.org/TR/xslt#built-in-rule and then it should be apparent why this simple stylesheet will (well, should) do what you want:

<?xml version="1.0"?>
<xsl:stylesheet xmlns="http://www.w3.org/1999/XSL/Transform" version="1.0">

<xsl:template match="comment()">
  <xsl:copy/>
</xsl:template>

<xsl:template match="text()|@*"/>

</xsl:stylesheet>

Try :

<xsl:template match="/">
  <xsl:for-each select="//comment()">
   <SRC_COMMENT>
   <xsl:value-of select="."/>
   </SRC_COMMENT>
  </xsl:for-each>
 </xsl:template>
or use a <xsl:comment ...> instruction for a more literal duplication of the source     document content in place of my <SRC_COMMENT> tag.