I have an xsl document with javascript int it in which i append url parameters to the string.
window.parent.parent.addTab('Loading...', 'PGS/ContentView.aspx?dpath=' + dpath + '&hashValue=' + hashValue);
The xsl using visual studio gives me an error stating entity 'hashvalue' not defined, its a valid parameter being passed to the function.
Try to use &
and wrap it in the xsl:text:
<xsl:text disable-output-escaping="yes">&</xsl:text>