<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div><br class=""><blockquote type="cite" class=""><div class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">An abstract base class can expose private or internal abstract requirements to its implementation subclasses while exporting a different interface for external users.</span></div></blockquote></div>I think what you want for this is real orthogonality of access rights (being able to declare a method that can’t be called, but just overridden) — but I fear this option died with „open“, and the topic is scorched earth for the next years</body></html>