CODEWITHSUNDEEP
xslt
MrL MrK
MrL MrK

Reputation: 17

XSL: including a tag only if the original file has that tag

I'm sorry if this is a duplicate, but I know very little about XSL and so I have failed to apply other answers I have found. 

<node>
  <xsl:attribute name='TEXT'><xsl:value-of select='@text' /></xsl:attribute>
  <richcontent TYPE="NOTE"><xsl:value-of select='@_note' /></richcontent>
</node>

So what I need is to create the <richcontent> tag only if the @_note element exists in the original document. If it is absent, I don't want to create the <richcontent> tag in the new document.

I suspect I need something like "when", but I'm not sure how to use it. When I try the following

<node>
  <xsl:when test='@_note'>
    <richcontent TYPE="NOTE"><xsl:value-of  select='@_note' />
    </richcontent>
  </xsl:when>
</node>

I get this error 

 element when is not allowed within that context

Upvotes: 0

Views: 413

Answers (2)

zx485
zx485

Reputation: 29042

There can be no @_node element, because this is not a valid QName, because it starts with the '@' character. QNames can only start with :, _, A-Z, a-z, or some UniCode characters described in the link above.

Your <xsl:when> approach to a solution is invalid, because <xsl:when> is only valid in the context of <xsl:choose> like this:

<node>
  <xsl:choose>
    <xsl:when test='@_note'>
      <richcontent TYPE="NOTE">
        <xsl:value-of  select='@_note' />
      </richcontent>
    </xsl:when>
  </xsl:choose>
</node>

But you need to rename your element @_note to something that conforms to the QName specification.

Upvotes: 0

michael.hor257k
michael.hor257k

Reputation: 117073

The error you see is thrown because xsl:when must be a child of xsl:choose.

In your case, when you have no alternative xsl:when or xsl:otherwise instructions, you should be using xsl:if instead.

Alternatively (and perhaps preferably), you could use a template matching the node in question: if the node does not exist, the template will not be applied, and the new element will not be created.

Upvotes: 2

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