Step numbering in XSL-FO

Question

Been struggling with this for a bit and now going to ask for help. I am trying to get the correct number for a step to appear when referencing it on PDF output when using XSL-FO. With help previously gotten here I have other references working as desired. These particular tags are giving me trouble.

This is for a fault isolation tree in the S1000D aerospace publication spec:

<isolationStep id="step4"><isolationStepQuestion>Check for burnt-out lamps. Are lamps good?</isolationStepQuestion><isolationStepAnswer><yesNoAnswer><yesAnswer nextActionRefId="step6"/><noAnswer nextActionRefId="step8"/></yesNoAnswer></isolationStepAnswer></isolationStep>

As you can see there is an answer section for the question. Those answers have refIds to other steps. In the PDF I am getting the steps to be numbered correctly, but when rendering the answers I am getting this:

The XSL-FO used for the questions, answers, and the attempt to number to answer referenced steps:

<xsl:template match="isolationStep | isolationProcedureEnd">
    <xsl:for-each select="note">
        <fo:block font-weight="bold">Note</fo:block>
        <xsl:apply-templates/>
    </xsl:for-each>
    <xsl:for-each select="caution">
        <fo:block font-weight="bold" text-align="center">CAUTION</fo:block>
        <xsl:apply-templates/>
    </xsl:for-each>
    <xsl:for-each select="warning">
        <fo:block font-weight="bold" text-align="center">WARNING</fo:block>
        <xsl:apply-templates/>
    </xsl:for-each>
    <fo:block id="{@id}" padding="5pt" font-size="10pt">
        <!-- border-style="solid"
              border-width=".1mm"-->
        <!--<xsl:apply-templates/>-->
        <fo:list-block space-after="2mm">
            <fo:list-item>
                <fo:list-item-label end-indent="label-end()">
                    <fo:block>
                        <xsl:number level="multiple" count="isolationMainProcedure/isolationStep | isolationProcedureEnd" format="1."/>
                    </fo:block>
                </fo:list-item-label>
                <fo:list-item-body start-indent="body-start()">
                    <fo:block>
                        <!--<xsl:apply-templates select="title"/>-->
                        <xsl:choose>
                            <xsl:when test="count(action) &gt; 1">
                                <xsl:for-each select="action">
                                    <fo:list-block space-after="2mm">
                                        <fo:list-item>
                                            <fo:list-item-label end-indent="label-end()">
                                            <fo:block>
                                            <xsl:number format="a."/>
                                            </fo:block>
                                            </fo:list-item-label>
                                            <fo:list-item-body start-indent="body-start()">
                                            <fo:block>
                                            <xsl:apply-templates/>
                                            </fo:block>
                                            </fo:list-item-body>
                                        </fo:list-item>
                                    </fo:list-block>
                                    <!--<xsl:apply-templates/>-->
                                </xsl:for-each>
                            </xsl:when>
                            <xsl:otherwise>
                                <xsl:for-each select="action">
                                    <fo:block>
                                        <xsl:apply-templates/>
                                    </fo:block>
                                    <!--<xsl:apply-templates/>-->
                                </xsl:for-each>
                            </xsl:otherwise>
                        </xsl:choose>
                        
                        <xsl:apply-templates select="isolationStepQuestion"/>
                        <xsl:apply-templates select="isolationStepAnswer"/>
                    </fo:block>
                </fo:list-item-body>
            </fo:list-item>
        </fo:list-block>
    </fo:block>
</xsl:template>


<xsl:template match="isolationStep | isolationProcedureEnd" mode="nbr">
    <xsl:variable name="origNbr">
        <xsl:number level="multiple" format="1"/>            
    </xsl:variable>
    <xsl:value-of select="$origNbr"/>
</xsl:template>

<xsl:template match="isolationStepQuestion">
    <fo:block font-weight="bold">
        <xsl:value-of select="."/>
    </fo:block>
</xsl:template>

<xsl:template match="yesNoAnswer">
    <xsl:apply-templates/>
</xsl:template>

<xsl:template match="yesAnswer">
    <xsl:variable name="ref" select="@nextActionRefId"/>
    <fo:block space-before="4pt" space-after="4pt" keep-with-previous="always">
        <fo:inline><xsl:text>Yes: Go to </xsl:text>
            <fo:basic-link internal-destination="{@nextActionRefId}" color="blue">Step  <!--<xsl:value-of select="$yesref2"/>-->
                <!--ancestor::isolationMainProcedure-->
                <!--<xsl:apply-templates select="an../../../.././isolationStep | isolationProcedureEnd[@id=$yesref]" mode="nbr"/> ancestor::isolationMainProcedure[1]/-->
                <xsl:apply-templates select="//isolationStep | isolationProcedureEnd[@id=$ref]" mode="nbr"/>
            </fo:basic-link></fo:inline>
    </fo:block>
</xsl:template>

<xsl:template match="noAnswer">
    <xsl:variable name="ref" select="@nextActionRefId"/>
    <fo:block keep-with-previous="always">
        <fo:inline>
            <xsl:text>No: Go to </xsl:text>
            <fo:basic-link internal-destination="{@nextActionRefId}" color="blue">Step 
                <xsl:apply-templates select="//isolationStep | isolationProcedureEnd[@id=$ref]" mode="nbr"/>
            </fo:basic-link></fo:inline>
    </fo:block>
</xsl:template>

<xsl:template match="isolationStepAnswer">
    <xsl:apply-templates/>
</xsl:template>

<xsl:template match="isolationStep | isolationProcedureEnd" mode="nbr">
    <xsl:variable name="origNbr">
        <xsl:number level="multiple" format="1"/>            
    </xsl:variable>
    <xsl:value-of select="$origNbr"/>
</xsl:template>

Also, the links are working, and takes you to the correct location. I just am having issues getting it to number correctly.

This is an XSL 2.0 stylesheet. Any help is appreciated, thanks in advance.

Answer 1

The //isolationStep is selecting every isolationStep in the document, so you're getting the number of each of them.

You might have been trying to have the effect of "//isolationStep[@id=$ref] | //isolationProcedureEnd[@id=$ref], but you'd probably be better of using a key for looking up isolationStep and isolationProcedureEnd by their IDs.

---

Keys are defined at http://www.w3.org/TR/xslt20/#key

You could define a key for lookup of isolationStep elements by their @id as a top-level element in the stylesheet:

<xsl:key name="isolationSteps"
         match="isolationStep"
         use="@id" />

and in your template, use the key() function to find the isolationStep with the matching @id value:

<xsl:template match="yesAnswer">
    <xsl:variable name="ref" select="@nextActionRefId"/>
    <fo:block space-before="4pt" space-after="4pt" keep-with-previous="always">
        <fo:inline><xsl:text>Yes: Go to </xsl:text>
            <fo:basic-link internal-destination="{@nextActionRefId}" color="blue">Step  <!--<xsl:value-of select="$yesref2"/>-->
                <!--ancestor::isolationMainProcedure-->
                <!--<xsl:apply-templates select="an../../../.././isolationStep | isolationProcedureEnd[@id=$yesref]" mode="nbr"/> ancestor::isolationMainProcedure[1]/-->
                <xsl:apply-templates select="key('isolationSteps', $ref)" mode="nbr"/>
            </fo:basic-link></fo:inline>
    </fo:block>
</xsl:template>