Entity Reference Questions

>From XSLT Programmer Reference, Mike says

<!DOCTYPE xsl:stylesheet [
     <!ENTITY  nl  "<xsl:text>&#160;</xsl:text>">
]>

However, as I quote &nl; within XSL, the xerces parser throw an Exception.

javax.xml.transform.TransformerException: xsl:text is not allowed in this
position in the stylesheet

but if I place <xsl:text>&#160;</xsl:text> within XSL, It is ok.

What is the difference ? Do anyone has any clue ?



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