    public QName get(String qualifiedName, String uri) {
        int index = qualifiedName.indexOf(':');

        if (index < 0) {
            return get(qualifiedName, Namespace.get(uri));
        } else if (index == 0){
            throw new IllegalArgumentException("Qualified name cannot start with ':'.");
        } else {
            String name = qualifiedName.substring(index + 1);
            String prefix = qualifiedName.substring(0, index);

            return get(name, Namespace.get(prefix, uri));
        }
    }
The software does not properly neutralize special elements that are used in XML, allowing attackers to modify the syntax, content, or commands of the XML before it is processed by an end system.