xslt - Add text to XML child element using XSL while preserving all children and attributes of children -

i'm trying add text paragraph based on 'performance' attribute of it's 'step' parent.

if step marked 'performance="optional"' resulting text (for second step below) this:

"2. (optional) step 2..."

<procedure>     <step id="step_lkq_c1l_5j">         <para>this step 1, required.</para>     </step>     <step performance="optional">         <para>this step 2, optional, unlike <xref linkend="step_lkq_c1l_5j"/>.             <note>                 <para>i don't want lose note in transformation.</para>             </note>         </para>     </step>     <step>         <para>this step 3.</para>     </step> </procedure> 

i tried using xpath match node , modify it: <xsl:template match="step[@performance='optional']/child::para[position()=1]"> , using concat() attempt prepend optional text, lose xref link (possibly because concat() doesn't respect children , attributes?)

i've gotten sort of close want using following xsl customization, (optional) text sits outside paragraph , drops step text down line , breaks page content. want genereated text inside first paragraph.

does have suggestion?

    <!-- add "(optional) " steps have performance="optional" attribute set --> <xsl:template match="procedure/step|substeps/step">     <xsl:variable name="id">         <xsl:call-template name="object.id"/>     </xsl:variable>      <xsl:variable name="keep.together">         <xsl:call-template name="pi.dbfo_keep-together"/>     </xsl:variable>      <fo:list-item xsl:use-attribute-sets="list.item.spacing">         <xsl:if test="$keep.together != ''">             <xsl:attribute name="keep-together.within-column"><xsl:value-of                 select="$keep.together"/></xsl:attribute>         </xsl:if>          <fo:list-item-label end-indent="label-end()">             <fo:block id="{$id}">                 <!-- dwc: fix 1 step procedures. use bullet if there's no step 2 -->                 <xsl:choose>                     <xsl:when test="count(../step) = 1">                         <xsl:text>&#x2022;</xsl:text>                     </xsl:when>                     <xsl:otherwise>                         <xsl:apply-templates select="." mode="number">                             <xsl:with-param name="recursive" select="0"/>                         </xsl:apply-templates>.                     </xsl:otherwise>                 </xsl:choose>             </fo:block>         </fo:list-item-label>         <xsl:choose>             <xsl:when test="@performance='optional'">                 <fo:list-item-body start-indent="body-start()">                     <fo:block>                         <xsl:text>(optional) </xsl:text>                         <xsl:apply-templates/>                     </fo:block>                 </fo:list-item-body>             </xsl:when>             <xsl:otherwise>                 <fo:list-item-body start-indent="body-start()">                     <fo:block>                         <xsl:apply-templates/>                     </fo:block>                 </fo:list-item-body>             </xsl:otherwise>         </xsl:choose>     </fo:list-item> </xsl:template> 

it's not clear question whether want know how add "(optional)" text, or whether want incorporated xsl-fo, or whether want "2." numbering well. here's simple answer first case:

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/xsl/transform">   <xsl:output method="xml" indent="yes"/>   <xsl:strip-space elements="*"/>    <xsl:template match="@* | node()">     <xsl:copy>       <xsl:apply-templates select="@* | node()"/>     </xsl:copy>   </xsl:template>    <xsl:template match="step[@performance = 'optional']/para/text()[1]">     <xsl:value-of select="concat('(optional) ', normalize-space())"/>   </xsl:template> </xsl:stylesheet> 

when run on sample input, produces:

<procedure>   <step id="step_lkq_c1l_5j">     <para>this step 1, required.</para>   </step>   <step performance="optional">     <para>(optional) step 2, optional, unlike<xref linkend="step_lkq_c1l_5j" />.       <note><para>i don't want lose note in transformation.</para></note></para>   </step>   <step>     <para>this step 3.</para>   </step> </procedure> 

to numbering, can replace second template this:

  <xsl:template match="step[@performance = 'optional']/para/text()[1]">     <xsl:variable name="sequence">       <xsl:number level="multiple" count="step"/>     </xsl:variable>     <xsl:value-of select="concat($sequence, '. (optional) ', normalize-space())"/>   </xsl:template> 

which produces:

<procedure>   <step id="step_lkq_c1l_5j">     <para>this step 1, required.</para>   </step>   <step performance="optional">     <para>2. (optional) step 2, optional, unlike<xref linkend="step_lkq_c1l_5j" />.       <note><para>i don't want lose note in transformation.</para></note></para>   </step>   <step>     <para>this step 3.</para>   </step> </procedure> 

and number steps, can replace same template this:

  <xsl:template match="step/para/text()[1]">     <xsl:variable name="sequence">       <xsl:number level="multiple" count="step"/>     </xsl:variable>     <xsl:value-of select="concat($sequence, '. ')"/>      <xsl:if test="../../@performance = 'optional'">       <xsl:text>(optional) </xsl:text>     </xsl:if>      <xsl:value-of select="normalize-space()"/>   </xsl:template> 

which produces:

<procedure>   <step id="step_lkq_c1l_5j">     <para>1. step 1, required.</para>   </step>   <step performance="optional">     <para>2. (optional) step 2, optional, unlike<xref linkend="step_lkq_c1l_5j" />.       <note><para>i don't want lose note in transformation.</para></note></para>   </step>   <step>     <para>3. step 3.</para>   </step> </procedure>