A Proposal for Bidi Isolates in Unicode

DECNAVDA c++ ELPMIS EDAM
This would not happen, however, if the book title used the proposed isolation characters:
ADVANCED LRI
c++ PDI
MADE SIMPLE
This would come out as intended in both LTR and RTL contexts.
The moral: using isolation is more robust than using embeddings or marks.
Of course, this will not always work perfectly. For example, a slightly shorter version of our title,
ADVANCED LRI
c++ PDI
will be displayed in an LTR context as
DECNAVDA c++
instead of the intended
c++ DECNAVDA
Seemingly, the isolates do no better here than the versions using embeddings and marks, i.e.
ADVANCED c++ LRM
and
ADVANCED LRE
c++ PDF
which are displayed in LTR with exactly the same problem.
Still, there is a difference. If we have another simple-minded application, this time an RTL one,
that displays the book title followed by its date of publication, e.g. " (29 MAY 2008)", the traditional
versions of our shortened book title do something terrible:
(2008 YAM c++ (29 DECNAVDA
The isolate version of the title, however, comes out as intended:
(2008 YAM 29) c++ DECNAVDA