[xsl] escaping curly braces in attribute values

["Christophe Marchand cmarchand@xxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

Hello,


I want to create a variable :

<xsl:variable name="foe" as="element(element)">
  <element 
path="/Q{http://www.w3.org/1999/XSL/Transform}stylesheet[1]/Q{http://www.w3.org/1999/XSL/Transform}template[1]"/>
</xsl:variable>

Where element/@path is a string value that denotes a XPath expression, 
not an XPath expression that should be evaluated.

How do I escape "{" "}" ?

Best regards,
Christophe