Time to add a layer of complexity: recursion.

Is there a way to not only check to make sure that the ParentQuestion
is the proper value, but also check the all its ancestor questions
(i.e. the ParentQuestion of the ParentQuestion, so forth and so on)?

Moskie wrote:
> Thanks, George! That seems to do the trick.
>
> I guess I'm fairly new to XSL, so the way you're setting the
> showQuestion variable is new to me. Thanks for the tip.
>
>
> Moskie
>
> George Bina wrote:
> > 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?