Sentence Break - Format
Format is a classification for characters that are typically invisible or zero-width, yet they can influence how text is processed for sentence boundaries. These characters, such as zero-width space, joiners, or control codes, do not themselves start or end a sentence but may affect the segmentation algorithm by being ignored or by altering the context of surrounding characters. When a Sentence Break analysis encounters a Format character, it generally treats it as a non-breaking placeholder, meaning it does not create a boundary, but it can still impact the decision if it appears adjacent to punctuation or other boundary-indicating marks. In practice, this ensures that invisible formatting does not accidentally split a sentence, while still allowing such characters to participate in the overall sequence evaluation.