public Optional<Dbms> dbms() {
        return documentOfType(Dbms.class);
    }
Return this node or any ancestral node that is a {@link Dbms}. If no such
node exists, an empty {@code Optional} is returned.

@return  the dbms node
generator-parent/generator-translator/src/main/java/com/speedment/generator/translator/TranslatorSupport.java