c# - Cannot re-assign a value to XSLT variable, or can I exit from for-each loop conditionally -

cannot re-assign value xslt variable, or can exit from
<xsl:for-each conditionally
xml

<r>   <a id="a">       <s id="a111">1</s>       <s id="a222">2</s>     <s id="a333">3       <s id="a3331">3.1</s>       <s id="a3332">3.2</s>       <s id="a3333">3.3</s>       </s>     <s id="a444">4</s>     <s id="a555">5</s>     <s id="a666">6</s>   </a>   <a id="x">     <s id="x111">1</s>     <s id="x222">2</s>     <s id="x333">3       <s id="x3331">3.1</s>       <s id="x3332">3.2</s>       <s id="x3333">3.3</s>     </s>     <s id="x444">4</s>     <s id="x555">5</s>     <s id="x666">6</s>   </a> </r> 

my xslt

     <select id ="s"  name="slist">      <option>        <xsl:attribute name="value"></xsl:attribute> please select s       </option>      <xsl:for-each select="a[id='x']//s">         <xsl:if test="'x3333'= @id">          <xsl:variable name="currents" select="true()"/>        </xsl:if>        <xsl:if test="'x3333'!= @id">          <xsl:variable name="currents" select="false()"/>        </xsl:if>         <xsl:if test="@currents = false()">          <option>            <xsl:if test="@id = 'x3333'">              <xsl:attribute name="selected">selected</xsl:attribute>            </xsl:if>            <xsl:attribute name="value">              <xsl:value-of select="@id"/>            </xsl:attribute>                          <xsl:value-of select="text"/>          </option>        </xsl:if>      </xsl:for-each> 

i'm trying create drop down list , need include s items in list. passing current position (current s, in example x3333) , current id of a. want list of s elements within recent a element.

in example, since current s x3333 , id of a x need x111,x222,x333,x3331,x3332 in list. means need eliminate these

  <s id="x444">4</s>,   <s id="x555">5</s>,   <s id="x666">6</s>, nodes 

from code <xsl:for-each select="a[id='x']//s">

i'm getting list of s elements in a id='x'

can suggest me solution please?

it not clear try do.
here hints xslt:

wrong access of attribute: <xsl:for-each select="a[id='x']//s">
test attribute id use @id: <xsl:for-each select="a[@id='x']//s">
you cant redefine variable:

<xsl:if test="'x3333'= @id">         <xsl:variable name="currents" select="true()"/> </xsl:if> <xsl:if test="'x3333'!= @id">      <xsl:variable name="currents" select="false()"/> </xsl:if> 

the variable currents defined in scope of xsl:if. set variable value depending of attribute id try this:

        <xsl:variable name="currents">             <xsl:choose>                 <xsl:when test="@id = 'x3333'">                     <xsl:text>true</xsl:text>                 </xsl:when>                 <xsl:otherwise>                     <xsl:text>false</xsl:text>                 </xsl:otherwise>             </xsl:choose>         </xsl:variable> 

wrong access of variable value: <xsl:if test="@currents = false()">
xslt variable access done wint $ prefix.

<xsl:if test="$currents = 'false'"> 

according interpretation of xlst may help:

<?xml version="1.0" encoding="iso-8859-1"?> <xsl:stylesheet version="1.0"                  xmlns:xsl="http://www.w3.org/1999/xsl/transform" >     <xsl:template match="r">          <select id ="s"  name="slist">             <option>                 <xsl:attribute name="value"></xsl:attribute> please select s             </option>             <xsl:for-each select="a[@id='x']//s">                 <xsl:variable name="currents">                 <xsl:choose>                     <xsl:when test="preceding::s[@id = 'x3333']">                         <xsl:text>true</xsl:text>                     </xsl:when>                     <xsl:otherwise>                         <xsl:text>false</xsl:text>                     </xsl:otherwise>                 </xsl:choose>              </xsl:variable>                 <xsl:if test="$currents = 'false'">                     <option>                         <xsl:if test="@id = 'x3333'">                             <xsl:attribute name="selected">selected</xsl:attribute>                         </xsl:if>                         <xsl:attribute name="value">                             <xsl:value-of select="@id"/>                         </xsl:attribute>                         <xsl:value-of select="normalize-space(text())"/>                     </option>                 </xsl:if>             </xsl:for-each>         </select>     </xsl:template> </xsl:stylesheet> 

which generate following output:

<?xml version="1.0"?> <select id="s" name="slist">     <option value="">         please select s     </option>     <option value="x111">1</option>     <option value="x222">2</option>     <option value="x333">3</option>     <option value="x3331">3.1</option>     <option value="x3332">3.2</option>     <option selected="selected" value="x3333">3.3</option> </select>