I've read through the months-long discussion regarding the introduction, and seen some very helpful proposals from each of the main participants. I'd like to plead for at least a conservative interim revision of the unreadable and uninterpretable paragraph that is there now. By conservative, I mean to  retaining the existing terminology, but to open with a positive declarative sentence without asides, exceptions and negatives. Hammer out the exact terminology later, and other contentious issues in continued discussion. That change will at least allow the visitor to orient on first arrival. Thanks!