protected final void processValue(CharSequence value, XPathContext context) throws XPathException {
        int nameCode = evaluateNameCode(context);
//        if (nameCode == -1) {
//            return null;
//        }
        SequenceReceiver out = context.getReceiver();
        int opt = getOptions();
        int ann = getAnnotation();

    	// we may need to change the namespace prefix if the one we chose is
    	// already in use with a different namespace URI: this is done behind the scenes
    	// by the ComplexContentOutputter

        //CharSequence value = expandChildren(context).toString();
        SimpleType schemaType = getSchemaType();
        int validationAction = getValidationAction();
        if (schemaType != null) {
            // test whether the value actually conforms to the given type
            try {
                ValidationFailure err = schemaType.validateContent(
                        value, DummyNamespaceResolver.getInstance(), context.getConfiguration().getNameChecker());
                if (err != null) {
                    ValidationException ve = new ValidationException(
                            "Attribute value " + Err.wrap(value, Err.VALUE) +
                                               " does not match the required type " +
                                               schemaType.getDescription() + ". " +
                                               err.getMessage());
                    ve.setErrorCode("XTTE1540");
                    throw ve;
                }
            } catch (UnresolvedReferenceException ure) {
                throw new ValidationException(ure);
            }
        } else if (validationAction== Validation.STRICT ||
                validationAction==Validation.LAX) {
            try {
                ann = context.getConfiguration().validateAttribute(nameCode, value, validationAction);
            } catch (ValidationException e) {
                XPathException err = XPathException.makeXPathException(e);
                err.maybeSetErrorCode((validationAction==Validation.STRICT ? "XTTE1510" : "XTTE1515"));
                err.setXPathContext(context);
                err.maybeSetLocation(this);
                err.setIsTypeError(true);
                throw err;
            }
        }
        if ((nameCode & NamePool.FP_MASK) == StandardNames.XML_ID) {
            value = Whitespace.collapseWhitespace(value);
        }
        try {
            out.attribute(nameCode, ann, value, locationId, opt);
        } catch (XPathException err) {
            throw dynamicError(this, err, context);
        }

        //return null;
    }