AVSpeechSynthesisMarker.Mark.bookmark A Speech Synthesis Markup Language (SSML) mark tag. Declarationcase bookmark See AlsoMarksAVSpeechSynthesisMarker.Mark.wordAVSpeechSynthesisMarker.Mark.sentenceAVSpeechSynthesisMarker.Mark.paragraphAVSpeechSynthesisMarker.Mark.phoneme