# VoiceXML 2.0 / VoiceXML 2.1 Reference Standard Tags (New VoiceXML 2.0 extensions are highlighted in green; VoiceXML 2.1 features are highlighted in orange.)
A - C <assign> <audio> <block> <catch> <choice> <clear> | D - E <data> <disconnect> <dtmf> <else> <elseif> <enumerate> <error> <exit> | F - J <field> <filled> <foreach> <form> <goto> <grammar> <help> <if> <initial> | K - O <link> <log> <mark> <menu> <meta> <noinput> <nomatch> <object> <option> | P - R <param> <prompt> <property> <record> <reprompt> <return> | S - Z <script> <subdialog> <submit> <throw> <transfer> <value> <var> <vxml>
Speech Markup (SSML) Tags (New VoiceXML 2.0 extensions are highlighted in green; VoiceXML 2.1 features are highlighted in orange.)
A - D <audio> <break> | E - L <emphasis> <lexicon> | M - O <mark> <meta> <metadata> | P - R <paragraph> <p> <phoneme> <prosody> | S - U <say-as> <sentence> <s> <speak> <sub> | V - Z <voice>