Defaulting values in xsl

Hi All,

I have the following segment in my XSL :
        <Book>
                        <BookName><xsl:value-of select="BOOK_NM"/></BookName>
        </Book>

In my output XML, I want to default the value of <BookName> as
"Unknown" , even if the value of "BOOK_NM" in original document is
null.

In case null , the input XML document will have BOOK_NM as :

< BOOK_NM ></BOOK_NM >

Could you please suggest a solution ?

I am using xalan-j_2_7_0 as the XSLT processor.

Thanks,
Mini

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