Hi,

You need to iterate on the triggers for a questions and check each
trigger condition:

<xsl:stylesheet version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:key name="tr" match="Trigger" use="QuestionID"/>
  <xsl:key name="q" match="Question" use="QuestionID"/>
  <xsl:template match="/*">
    <xsl:copy>
      <xsl:for-each select="Question">
        <xsl:variable name="triggers" select="key('tr', QuestionID)"/>
        <xsl:variable name="showQuestion">
          <xsl:choose>
            <xsl:when test="count($triggers)=0">yes</xsl:when>
            <xsl:otherwise>
              <xsl:for-each select="$triggers">
                <xsl:if
test="ParentValue=key('q',ParentQuestionID)/CurrentValue">yes</xsl:if>
              </xsl:for-each>
            </xsl:otherwise>
          </xsl:choose>
        </xsl:variable>
        <xsl:if test="string-length($showQuestion)>0">
          <xsl:copy-of select="."/>
        </xsl:if>
      </xsl:for-each>
    </xsl:copy>
  </xsl:template>
</xsl:stylesheet>

Best Regards,
George
---------------------------------------------------------------------
George Cristian Bina
<oXygen/> XML Editor, Schema Editor and XSLT Editor/Debugger
www.---.com


moskie@g... wrote:
> I have some XML representing survey questions and answers, along with
> "trigger" definitions that represent a signal for when certain
> questions should be displayed. Here's a stripped down example:
>
> <Question>
>      <QuestionID>1</QuestionID>
>      <CurrentValue>0</CurrentValue>
> </Question>
> <Question>
>      <QuestionID>2</QuestoinID>
>      <CurrentValue>1</CurrentValue>
> </Question>
> <Question>
>      <QuestionID>3</QuestionID>
>      <CurrentValue>0</CurrentValue>
> </Question>
>
> <Trigger>
>      <QuestionID>3</QuestionID>
>      <ParentQuestionID>1</ParentQuestionID>
>      <ParentValue>0</ParentValue>
> </Trigger>
> <Trigger>
>      <QuestionID>3</QuestionID>
>      <ParentQuestionID>2</ParentQuestionID>
>      <ParentValue>0</ParentValue>
> </Trigger>
>
> Basically, those triggers say that Question 3 should be displayed when
> either Question 1 has a value of 0, or when Question 2 has a value of
> 0. I plan to loop through each question, then run a test expression
> that will determine whether that particular question gets displayed.
>
> First, the easy part:I test to see if there are no triggers for a
> question, meaning that the question should always be displayed:
>
>      not(../Trigger[QuestionID = current()/QuestionID])
>
> The other part is where I'm stuck: testing to see if any of the
> triggers' conditions have been met. This is what I have so far:
>
> or
> ../Question[QuestionID = ../Trigger[QuestionID =
> current()/QuestionID]/ParentQuestionID]/CurrentValue =
> ../Trigger[QuestionID = current()/QuestionID]/ParentValue
>
> However, that just compares the set of CurrentValues of ParentQuestions
> with the set of ParentValues from the all the Trigger nodes.... but
> doesn't correlate the ParentQuestion and ParentAnswers together...
> 
> Can anyone help me out in getting this expression to work?