bundles/org.apache.jasper.glassfish/src/org/apache/jasper/compiler/JspUtil.java
public static String getExprInXml(String expression) {
        String returnString;
        int length = expression.length();

        if (expression.startsWith(OPEN_EXPR) 
                && expression.endsWith(CLOSE_EXPR)) {
            returnString = expression.substring (1, length - 1);
        } else {
            returnString = expression;
        }

        return escapeXml(returnString);
    }
public static String getExprInXml(String expression) {
        String returnString;
        int length = expression.length();

        if (expression.startsWith(OPEN_EXPR) 
                && expression.endsWith(CLOSE_EXPR)) {
            returnString = expression.substring (1, length - 1);
        } else {
            returnString = expression;
        }

        return escapeXml(returnString);
    }
Takes a potential expression and converts it into XML form