void setDataformXSLT(String dataformXSLT) {
        this.dataformXSLT = dataformXSLT;
    }
Sets the URL of an XSL transformation which can be applied to the payload format
in order to generate a valid Data Forms result that the client could display
using a generic Data Forms rendering engine.

@param dataformXSLT the URL of an XSL transformation which can be applied to the
       payload format.
xmppserver/src/main/java/org/jivesoftware/openfire/pubsub/Node.java