Alexandrine introduce phrasal accentuation, or rigorously observe the medial caesura, as in French." Common usage within the literatures of European languages is broader still, embracing lines syllabic, accentual-syllabic, and (inevitably) stationed ambivalently between the two; lines of 12, 13, or even 14 syllables; lines with obligatory, predominant, and optional caesurae. Although alexandrines occurred in French verse as early as the 12th century, they were slightly looser rhythmically, and vied with the "décasyllabe" and "octosyllabe" for cultural prominence and use in various genres. "The alexandrine came into its own in the middle of the sixteenth century with the poets of the Pléiade
Vietnamese poetry syllables. Whereas in English verse syllables are categorized by relative "stress", and in classical Greek and Latin verse they are categorized by "length", in Vietnamese verse (as in Chinese) syllables are categorized by "tone". For metrical purposes, the 6 distinct phonemic tones that occur in Vietnamese are all considered as either "flat" or "sharp". Thus a line of metrical verse consists of a specific number of syllables, some of which must be flat, some of which must be sharp, and some of which may be either. Like verse in Chinese and most European languages, traditional Vietnamese verse is rhymed. The