[xsl] handling of xsl-Variable in formatting text

["Dirk Naujoks naujoks@xxxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

Good day,

i am a little mixed up how to use a once set xsl-variable.
I tried the following code


Start Code~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  <xsl:template name="pruefung">
        <xsl:variable name="outline">
            <xsl:choose>
                <xsl:when test="@pnr != '7000'">
                    normal
                </xsl:when>
                <xsl:otherwise>
                    bold
                </xsl:otherwise>
            </xsl:choose>
        </xsl:variable>
        <fo:table-row keep-with-next.within-column="always"
            padding-bottom="1pt" padding-top="1.0pt">
            <fo:table-cell number-columns-spanned="6"
                padding-before="0pt">
                <fo:block space-before="0pt">
                    <fo:leader leader-pattern="rule" rule-thickness="0.5pt"
                        leader-length="17cm" color="white" />
                </fo:block>
            </fo:table-cell>
        </fo:table-row>
        <fo:table-row keep-together.within-column="always"
            padding-bottom="1pt" padding-top="1pt" line-height="10pt">
            <fo:table-cell padding-right="3pt">
                <fo:block span="none" font-family="OfficinaSansLT"
                    font-size="{$schrifta}" font-weight="{$outline}" 
text-align="start">
                    <xsl:value-of disable-output-escaping="no" 
select="@pnr" />#
                    <xsl:value-of disable-output-escaping="no" 
select="@psem" />
                    <xsl:value-of disable-output-escaping="no" 
select="$outline" />
                </fo:block>
            </fo:table-cell>
            <fo:table-cell padding-right="5pt">
                <fo:block span="none" font-family="OfficinaSansLT"
                    font-size="{$schrifta}" text-align="start">
                    <xsl:choose>
                        <xsl:when test="@pnr != '7000'">
                            <xsl:value-of disable-output-escaping="no" 
select="@deTxt" />
                        </xsl:when>
                        <xsl:otherwise>
                            Note der fachpraktischen PrC<fung
                        </xsl:otherwise>
                    </xsl:choose>
                </fo:block>
            </fo:table-cell>
            <fo:table-cell padding-right="5pt">
                <fo:block span="none" font-family="OfficinaSansLT"
                    font-size="{$schrifta}" text-align="start" 
font-weight="">
                    <xsl:if test="@pstatus = 'AN'">
                        <xsl:value-of disable-output-escaping="no" 
select="@pstatus" />
                    </xsl:if>
                    <xsl:if test="@pstatus = 'EN'">
                        <xsl:value-of disable-output-escaping="no" 
select="@pstatus" />
                    </xsl:if>
                </fo:block>
            </fo:table-cell>
            <fo:table-cell padding-right="3pt">
                <fo:block span="none" font-family="OfficinaSansLT"
                    font-size="{$schrifta}" text-align="center" 
font-weight="">
                    <xsl:if test="@pnote != '' and @pnote != ' '">
                        <xsl:if test="@panerk = 'J'">
                            <xsl:variable name="anerk">
                                *
                            </xsl:variable>
                            <xsl:value-of
select="concat(substring(@pnote,1,1),',',substring(@pnote,2,1),' 
',$anerk)" />
                        </xsl:if>
                        <xsl:if test="not(@panerk)">
                            <xsl:value-of
select="concat(substring(@pnote,1,1),',',substring(@pnote,2,1))" />
                        </xsl:if>
                        <xsl:if test="@panerk = 'N'">
                            <xsl:value-of
select="concat(substring(@pnote,1,1),',',substring(@pnote,2,1))" />
                        </xsl:if>
                    </xsl:if>
                </fo:block>
            </fo:table-cell>
            <fo:table-cell padding-right="5pt">
                <fo:block span="none" font-family="OfficinaSansLT"
                    font-size="{$schrifta}" text-align="start" 
font-weight="">
                    <xsl:if test="@panerk = 'J'"></xsl:if>
                </fo:block>
            </fo:table-cell>
        </fo:table-row>
        <xsl:for-each select="veranst">
            <xsl:call-template name="veranst" />
        </xsl:for-each>
    </xsl:template>
End Code~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The variable "schrifta" works fine it is set at the beginning of the 
xsl-Document.
The variable "outline" doesn't work it is set. i can confirm it by using 
"<xsl:value-of disable-output-escaping="no" select="$outline" />" 
somewhere in the code e.g. after the select of psem at the beginning of 
this code-sniplet.

I can't format the text for the data with the pnr=7000 in the right way. 
Has anybody an idea how to fix it?

Thanks for your help in advance.