fo:table-row is missing child elements Exception

I have a piece of code defined in my xslt file in order to format some info
for the printing purposes.
But sometimes, the object which I am transforming against this xslt, doesn't
have the myAccountInfo 
tag's child elements and I get the exception . But I want something like
this : 
                     if the elements exists then print the info otherwise
just print "not available" or "Unknown" 
So if firstName element is not available then put "unknown" in place.

Can some body please help me about it and tell me how I can deal with it. 

Please put a little example code if possible.

Here is a piece of code I am using:

<xsl:template match="myAccountInfo">
        <fo:table xmlns:fo="http://www.w3.org/1999/XSL/Format"
table-layout="fixed" font-size="10pt"
            font-family="Arial, Helvetica, sans-serif">
            <fo:table-column column-number="1" column-width="1.75in"/>
            <fo:table-column column-number="2" column-width="1.75in"/>
            <fo:table-column column-number="3" column-width="1.75in"/>
            <fo:table-column column-number="4" column-width="1.75in"/>
            <fo:table-body>
                <fo:table-row>
                    <fo:table-cell
xmlns:fo="http://www.w3.org/1999/XSL/Format">
                        <fo:block
xmlns:fo="http://www.w3.org/1999/XSL/Format" text-align="center"
                            color="#0000FF" padding-before="2pt"
padding-bottom="3pt">
                            <xsl:value-of select="firstName"/>
                        </fo:block>
                    </fo:table-cell>
                    <fo:table-cell
xmlns:fo="http://www.w3.org/1999/XSL/Format"> > <fo:block
                            xmlns:fo="http://www.w3.org/1999/XSL/Format"
text-align="center"
                            color="#0000FF" padding-before="2pt"
padding-bottom="3pt">
                            <xsl:value-of select="lastName"/>
                        </fo:block>
                    </fo:table-cell>
                    <fo:table-cell
xmlns:fo="http://www.w3.org/1999/XSL/Format">
                        <fo:block
xmlns:fo="http://www.w3.org/1999/XSL/Format" text-align="center"
                            color="#FF0000" padding-before="2pt"
padding-bottom="3pt">
                            <xsl:value-of select="emailAddress"/>
                        </fo:block>
                    </fo:table-cell>
                    <fo:table-cell
xmlns:fo="http://www.w3.org/1999/XSL/Format"> > <fo:block
                            xmlns:fo="http://www.w3.org/1999/XSL/Format"
text-align="center"
                            color="#FF0000" padding-before="2pt"
padding-bottom="3pt">
                            <xsl:value-of select="zipCode"/>
                        </fo:block>
                    </fo:table-cell>
                </fo:table-row>
            </fo:table-body>
        </fo:table>
    </xsl:template>

and the error I am getting is : 


com.user.infra.CustomeException: xml transform error --
org.apache.fop.fo.ValidationException: :823:-1: Error(823/-1): fo:table-row
is missing child elements. 
Required Content Model: (table-cell+)
	at com.user.infra.prt.printInit(PrtUtil.java:271)


I will really appreciate for the help!
	
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Received on Thursday, 14 August 2008 04:37:48 UTC