Pass text value for each empty field using XSLT

I created one XSLT with all kinds of validations etc. Now my client wants me to pass XXX for every blank value. There are lot of fields and I don't wan't to do it manually for each field. Can yo please help. Below is my XSLT

<?xml version="1.0" encoding="UTF-8"?>

| | |

</xsl:template>
<!--Starting Employee Data -->
<xsl:template match="wd:Response_Data">
    <xsl:for-each select="wd:Worker">
        <xsl:value-of select="wd:Worker_Reference/wd:ID[@wd:type = 'Employee_ID']"/>
        <xsl:text>|</xsl:text>
        <xsl:choose>
            <xsl:when
                test="wd:Worker_Data/wd:Personal_Data/wd:Name_Data/wd:Preferred_Name_Data/wd:Name_Detail_Data/wd:Last_Name != ''">
                <xsl:value-of
                    select="wd:Worker_Data/wd:Personal_Data/wd:Name_Data/wd:Preferred_Name_Data/wd:Name_Detail_Data/wd:Last_Name"
                />
            </xsl:when>
            <xsl:otherwise>
                <xsl:value-of
                    select="wd:Worker_Data/wd:Personal_Data/wd:Name_Data/wd:Legal_Name_Data/wd:Name_Detail_Data/wd:Last_Name"
                />
            </xsl:otherwise>
        </xsl:choose>
        <xsl:text>|</xsl:text>
        <xsl:choose>
            <xsl:when
                test="wd:Worker_Data/wd:Personal_Data/wd:Name_Data/wd:Preferred_Name_Data/wd:Name_Detail_Data/wd:First_Name != ''">
                <xsl:value-of
                    select="wd:Worker_Data/wd:Personal_Data/wd:Name_Data/wd:Preferred_Name_Data/wd:Name_Detail_Data/wd:First_Name"
                />
            </xsl:when>
            <xsl:otherwise>
                <xsl:value-of
                    select="wd:Worker_Data/wd:Personal_Data/wd:Name_Data/wd:Legal_Name_Data/wd:Name_Detail_Data/wd:First_Name"
                />
            </xsl:otherwise>
        </xsl:choose>
        <xsl:text>|</xsl:text>

        <xsl:if
            test="count(wd:Worker_Data/wd:Personal_Data/wd:Contact_Data/wd:Address_Data) &gt; 1">
            <xsl:value-of
                select="wd:Worker_Data/wd:Personal_Data/wd:Contact_Data/wd:Address_Data[wd:Usage_Data/wd:Type_Data/wd:Type_Reference[wd:ID[@wd:type = 'Communication_Usage_Type_ID'] = 'HOME']]/wd:Address_Line_Data[@wd:Type = 'ADDRESS_LINE_1']"/>
            <xsl:text>|</xsl:text>
            <xsl:value-of
                select="wd:Worker_Data/wd:Personal_Data/wd:Contact_Data/wd:Address_Data[wd:Usage_Data/wd:Type_Data/wd:Type_Reference[wd:ID[@wd:type = 'Communication_Usage_Type_ID'] = 'HOME']]/wd:Address_Line_Data[@wd:Type = 'ADDRESS_LINE_2']"/>
            <xsl:text>|</xsl:text>
            <xsl:value-of
                select="wd:Worker_Data/wd:Personal_Data/wd:Contact_Data/wd:Address_Data[wd:Usage_Data/wd:Type_Data/wd:Type_Reference[wd:ID[@wd:type = 'Communication_Usage_Type_ID'] = 'HOME']]/wd:Address_Line_Data[@wd:Type = 'ADDRESS_LINE_3']"/>
            <xsl:text>|</xsl:text>
            <xsl:value-of
                select="wd:Worker_Data/wd:Personal_Data/wd:Contact_Data/wd:Address_Data[wd:Usage_Data/wd:Type_Data/wd:Type_Reference[wd:ID[@wd:type = 'Communication_Usage_Type_ID'] = 'HOME']]/wd:Municipality"/>
            <xsl:text>|</xsl:text>
            <xsl:value-of
                select="substring-after(wd:Worker_Data/wd:Personal_Data/wd:Contact_Data/wd:Address_Data[wd:Usage_Data/wd:Type_Data/wd:Type_Reference[wd:ID[@wd:type = 'Communication_Usage_Type_ID'] = 'HOME']]/wd:Country_Region_Reference/wd:ID[@wd:type = 'Country_Region_ID'], '-')"/>
            <xsl:text>|</xsl:text>
            <xsl:value-of
                select="wd:Worker_Data/wd:Personal_Data/wd:Contact_Data/wd:Address_Data[wd:Usage_Data/wd:Type_Data/wd:Type_Reference[wd:ID[@wd:type = 'Communication_Usage_Type_ID'] = 'HOME']]/wd:Postal_Code"/>

        </xsl:if>
        <xsl:text>|</xsl:text>

        <xsl:if
            test="count(wd:Worker_Data/wd:Personal_Data/wd:Contact_Data/wd:Address_Data) = 1">
            <xsl:value-of
                select="wd:Worker_Data/wd:Personal_Data/wd:Contact_Data/wd:Address_Data/wd:Address_Line_Data[@wd:Type = 'ADDRESS_LINE_1']"/>
            <xsl:text>|</xsl:text>
            <xsl:value-of
                select="wd:Worker_Data/wd:Personal_Data/wd:Contact_Data/wd:Address_Data/wd:Address_Line_Data[@wd:Type = 'ADDRESS_LINE_2']"/>
            <xsl:text>|</xsl:text>
            <xsl:value-of
                select="wd:Worker_Data/wd:Personal_Data/wd:Contact_Data/wd:Address_Data/wd:Address_Line_Data[@wd:Type = 'ADDRESS_LINE_3']"/>
            <xsl:text>|</xsl:text>
            <xsl:value-of
                select="wd:Worker_Data/wd:Personal_Data/wd:Contact_Data/wd:Address_Data/wd:Municipality"/>
            <xsl:text>|</xsl:text>
            <xsl:value-of
                select="substring-after(wd:Worker_Data/wd:Personal_Data/wd:Contact_Data/wd:Address_Data/wd:Country_Region_Reference/wd:ID[@wd:type = 'Country_Region_ID'], '-')"/>
            <xsl:text>|</xsl:text>
            <xsl:value-of
                select="wd:Worker_Data/wd:Personal_Data/wd:Contact_Data/wd:Address_Data/wd:Postal_Code"/>
            <!--     </xsl:if> -->
        </xsl:if>

        <xsl:text>|</xsl:text>


        <xsl:value-of select="wd:Worker_Data/wd:Employment_Data/wd:Position_Data/wd:Position_ID"/>
        <xsl:text>|</xsl:text>
        <xsl:value-of
            select="wd:Worker_Data/wd:Employment_Data/wd:Position_Data/wd:Position_Time_Type_Reference/wd:ID[@wd:type = 'Position_Time_Type_ID']"/>
        <xsl:text>|</xsl:text>
        <xsl:value-of
            select="wd:Worker_Data/wd:Employment_Data/wd:Position_Data/wd:Pay_Rate_Type_Reference/wd:ID[@wd:type = 'Pay_Rate_Type_ID']"/>
        <xsl:text>|</xsl:text>
        <xsl:value-of
            select="wd:Worker_Data/wd:Compensation_Data/wd:Employee_Compensation_Summary_Data/wd:Employee_Compensation_Summary_Data/wd:Currency_Reference/wd:ID[@wd:type = 'Currency_ID']"/>
        <xsl:text>|</xsl:text>
        <xsl:value-of
            select="wd:Worker_Data/wd:Compensation_Data/wd:Employee_Compensation_Summary_Data/wd:Employee_Compensation_Summary_Data/wd:Frequency_Reference/wd:ID[@wd:type = 'Frequency_ID']"/>
        <xsl:text>|</xsl:text>
        <xsl:value-of
            select="wd:Worker_Data/wd:Compensation_Data/wd:Employee_Compensation_Summary_Data/wd:Aualized_Summary_Data/wd:Total_Base_Pay"/>
        <xsl:text>&#xa;</xsl:text>

    </xsl:for-each>



</xsl:template>
<xsl:template match="text()"/>
</xsl:stylesheet>