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>

You use standard XML comments:

<!-- Comment -->

These are not processed by the XSLT transformer.

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.

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"/>

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>

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.