using the & char in xml/xsl file

my xml file has the example tag with

<tag>value&value</tag>

there is an error whe开发者_运维技巧n start the xsl file...

I use also &amp and the header

<?xml version="1.0" encoding="iso-8859-1"?>

but not ok

Thanks!

You need to escape the & to & in XML and XSLT:

<tag>value&amp;value</tag>