OpenSP and Plane 1 characters

I said something about plane 1 in my previous message.

Before plane 1 disappears from view, let me point out the issue for
OpenSP with plane 1 found in the discussion at sourceforge/openjade-dev
this month.  Of course, because MathML and XHTML are under the XML
umbrella, and XML parsers are widely available, one may think OpenSP
is irrelevant here.  But OpenSP is both relevant and nearly unique for
the general question of using author-level LaTeX-like languages to
write mathematical documents.  The issue is, therefore, tangential
here but not irrelevant.  If anyone out there has fixed this quietly,
I'd like to hear about it.

Thanks.

                                    -- Bill