Re: [xsl] Test processing instruction as first preceding sibling

["G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>]

At 2008-12-09 13:58 -0200, Alexandre Moraes wrote:
> Hi guys,
>
>         I have a doubt about testing
> preceding-sibling processing-instruction.
>         I have this xml:
>
>        <root>
>            <child1>
>                    child 1
>            </child1>
>            <?proc?>
>            <child2>
>                   child 2
>           </child2>
>      </root>
>
>            And I need to know if child2 has the first
> preceding-sibling as a processing-instruction. In this case it should
> return true.

But it isn't true.  There is a text node between
the processing instruction and <child2>.

>             The xml can come like this too:
>
>      <root>
>            <child1>
>                    child 1
>            </child1>
>            <child2>
>                   child 2
>           </child2>
>       </root>
>         In this case it should return false
>
> and like this:
>
>       <root>
>           <?proc?>
>            <child1>
>                    child 1
>            </child1>
>            <child2>
>                   child 2
>           </child2>
>       </root>
>
> and here false too.
>
> I tryed something like this
>
> preceding-sibling::*[1]/name()|preceding-sibling()[1]/name = 'proc'
>
> but it didn4t work.
>
> Can anyone help me??

The following:

         preceding-sibling::node()[not(self::text())][1]/
                     self::processing-instruction('proc')

says:

  "Get the preceding sibling nodes of any kind, looking only at the
   non-text nodes, then looking only at the first of those, checking
   that node is a processing instruction with the name 'proc'."

I hope this helps.

. . . . . . . . . . Ken

T:\>type alexandre.xsl
<?xml version="1.0" encoding="US-ASCII"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                version="1.0">

<xsl:output method="text"/>

<xsl:template match="/">
  <xsl:for-each select="//child2">
    <xsl:choose>
      <xsl:when test="preceding-sibling::node()[not(self::text())][1]/
                      self::processing-instruction('proc')">Yes!</xsl:when>
      <xsl:otherwise>No!</xsl:otherwise>
    </xsl:choose>
  </xsl:for-each>
</xsl:template>

</xsl:stylesheet>
T:\>type alexandre1.xml
       <root>
           <child1>
                   child 1
           </child1>
           <?proc?>
           <child2>
                  child 2
          </child2>
     </root>

T:\>xslt alexandre1.xml alexandre.xsl con
Yes!
T:\>type alexandre2.xml
     <root>
           <child1>
                   child 1
           </child1>
           <child2>
                  child 2
          </child2>
      </root>

T:\>xslt alexandre2.xml alexandre.xsl con
No!
T:\>type alexandre3.xml
      <root>
          <?proc?>
           <child1>
                   child 1
           </child1>
           <child2>
                  child 2
          </child2>
      </root>

T:\>xslt alexandre3.xml alexandre.xsl con
No!
T:\>


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