[orca-list] Does Orca use SSML tags other than speak and mark?

[Rastislav Kiss <rastislav kish gmail com>]

Hello everyone,
this question is perhaps primarily aimed for Orca developers, as it's
related to the screenreader's internal working.
I'd like to ask, does Orca use SSMl tags other than speak and mark when
sending messages to speech dispatcher?
I've tracked sd's pipe to find out what format does Orca use, when
sending speech requests. I have noticed one <speak> tag in every
message, as well as <mark> tags for setting markings on the spoken
text.
Except for these two, I didn't see any tags, even on places where they
could occur, for example when spelling or reading links.
Are there some I could possibly have missed?

The reason why I'm asking is my new program, which I've been developing
during the last week or two. As hollidays are finally here, I wanted to
improve my language skills a bit, by learning Mandarin Chinese.
However, espeak doesn't read chinese characters in neither slovak nor
English version, and Chinese version can't read even english text
properly due to pinyin, slovak is beyond any imagination. I don't know
about anything like Nvda's switchsynth for Orca (is there some
centralized depository of Orca addons btw?), so I've decided to solve
the problem myself.
I've made my own speech-dispatcher module, which doesn't contain speech
synthesis on its own, but which is able to load other sd modules and
after receiving text to speak, split it to parts written in various
alphabets, including latin and chinese and send the respective parts in
right time to right engine according to configuration.
Latin, chinese and cyrillic alphabets are supported right now, but
others can be added very easily if needed.

Anyway, the program works very nice, but one thing I really didn't want
to bother with was full SSML implementation, especially if most of it
won't be ever used and would just slow-down the engine.
It seems to be ready for release, I have implemented speak and mark
tags to be handled properly, however if other tags occurred in the
speak request, such as <emphasis>, in unlucky-enough situation, this
could cause splitting the opening and ending of the tag to various
engines, and would result in infinite loop.
That is something I'd like to prevent at all costs, as working speech
is crucial for us. Plus, as I saw today, an infinite loop effectively
takes down not just the speech, but also the whole screenreader, so...

Are there any other SSML tags used in Orca than <speak> and <mark>? Is
this situation likely to change in future?
SSML seems to be capable of dealing with various things such as
spelling or emphasising text, but Orca seems to rather be solving them
on its own. That's the point of the second question, whether this is
wanted or just temporary behavior until more complex SSML rendering is
created.

Thank you in advance!

Best regards

Rastislav