<s>
Speech	B-Application
Synthesis	I-Application
Markup	I-Application
Language	I-Application
(	O
SSML	O
)	O
is	O
an	O
XML-based	O
markup	O
language	O
for	O
speech	B-Application
synthesis	I-Application
applications	O
.	O
</s>
<s>
It	O
is	O
a	O
recommendation	O
of	O
the	O
W3C	O
's	O
Voice	B-Protocol
Browser	I-Protocol
Working	O
Group	O
.	O
</s>
<s>
SSML	O
is	O
often	O
embedded	O
in	O
VoiceXML	B-Application
scripts	O
to	O
drive	O
interactive	O
telephony	O
systems	O
.	O
</s>
<s>
For	O
desktop	O
applications	O
,	O
other	O
markup	O
languages	O
are	O
popular	O
,	O
including	O
Apple	O
's	O
embedded	O
speech	O
commands	O
,	O
and	O
Microsoft	O
's	O
SAPI	B-Application
Text	B-Application
to	I-Application
speech	I-Application
(	O
TTS	O
)	O
markup	O
,	O
also	O
an	O
XML	B-Protocol
language	O
.	O
</s>
<s>
It	O
is	O
also	O
used	O
to	O
produce	O
sounds	O
via	O
Azure	O
Cognitive	O
Services	O
 '	O
Text	B-Application
to	I-Application
Speech	I-Application
API	O
or	O
when	O
writing	O
third-party	O
skills	O
for	O
Google	B-Application
Assistant	I-Application
or	O
Amazon	B-Application
Alexa	I-Application
.	O
</s>
<s>
SSML	O
is	O
based	O
on	O
the	O
Java	B-Language
Speech	I-Language
Markup	I-Language
Language	I-Language
(	O
JSML	B-Language
)	O
developed	O
by	O
Sun	O
Microsystems	O
,	O
although	O
the	O
current	O
recommendation	O
was	O
developed	O
mostly	O
by	O
speech	B-Application
synthesis	I-Application
vendors	O
.	O
</s>
