Is it a principle of Unicode that a new script should not be encoded because it is one to one correspondence with an existing one, even though there is no graphical relationship?
No, and we have done so before. Cf. the Brahmic scripts, Coptic, Nuskhuri.
Well, that is certainly in conflict with Michael's comments about Aramaic, Samaritan etc.
No, it isn't. Samaritan isn't used as a cipher of Hebrew. It's used as Samaritan. Rosicrucian and a host of other scripts which are "just" cyphers for Latin.
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Michael Everson * * Everson Typography * * http://www.evertype.com
