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[http://www.shop263.com/doi-48/1.htm 石墨制品]
[http://www.shop263.com/doi-48/2.htm 石英晶体]
[http://www.shop263.com/doi-48/3.htm 石英晶体行业专用被银机]
[http://www.shop263.com/doi-48/4.htm 实时跟踪荧光基因扩增仪]
[http://www.shop263.com/doi-48/5.htm 实验室精密填料]
[http://www.shop263.com/doi-48/6.htm 食品]
[http://www.shop263.com/doi-48/7.htm 食品机]
[http://www.shop263.com/doi-48/8.htm 食品级]
[http://www.shop263.com/doi-48/9.htm 食品级和工业级磷酸]
[http://www.shop263.com/doi-48/10.htm 食品级磷酸三钙]
[http://www.shop263.com/doi-48/11.htm 食品加工用水处理]
[http://www.shop263.com/doi-48/12.htm 视镜]
[http://www.shop263.com/doi-48/13.htm 收口机]
[http://www.shop263.com/doi-48/14.htm 手动鹤管]
[http://www.shop263.com/doi-48/15.htm 手动螺旋压紧板框压滤机]
[http://www.shop263.com/doi-48/16.htm 手动试压泵]
[http://www.shop263.com/doi-48/17.htm 书刊装订热熔胶粘剂]
[http://www.shop263.com/doi-48/18.htm 输送设备]
[http://www.shop263.com/doi-48/19.htm 输油管线泵]
[http://www.shop263.com/doi-48/20.htm 双动拉伸机]
[http://www.shop263.com/doi-48/21.htm 双缸大流量试压泵]
[http://www.shop263.com/doi-48/22.htm 双级联合粉碎机组]
[http://www.shop263.com/doi-48/23.htm 双级推料离心机]
[http://www.shop263.com/doi-48/24.htm 双螺旋雏形混合机]
[http://www.shop263.com/doi-48/25.htm 双三螺旋混合机]
[http://www.shop263.com/doi-48/26.htm 双色高速铜版]
[http://www.shop263.com/doi-48/27.htm 双吸中开离心泵]
[http://www.shop263.com/doi-48/28.htm 双向土工格栅]
[http://www.shop263.com/doi-48/29.htm 双行星混合机]
[http://www.shop263.com/doi-48/30.htm 双行星搅拌机]
[http://www.shop263.com/doi-48/31.htm 双重密封阀门]
[http://www.shop263.com/doi-48/32.htm 双锥回转干燥器]
[http://www.shop263.com/doi-48/33.htm 双锥回转真空干燥机]
[http://www.shop263.com/doi-48/34.htm 水泵智能电气控制设备]
[http://www.shop263.com/doi-48/35.htm 水箅]
[http://www.shop263.com/doi-48/36.htm 水车式增氧机]
[http://www.shop263.com/doi-48/37.htm 水处理设备]
[http://www.shop263.com/doi-48/38.htm 水环泵]
[http://www.shop263.com/doi-48/39.htm 水环真空泵]
[http://www.shop263.com/doi-48/40.htm 水环真空泵系列]
[http://www.shop263.com/doi-48/41.htm 水净化设备]
[http://www.shop263.com/doi-48/42.htm 水帽]
[http://www.shop263.com/doi-48/43.htm 水泥配料微机数据采集控制系统]
[http://www.shop263.com/doi-48/44.htm 水暖软管]
[http://www.shop263.com/doi-48/45.htm 水喷射泵]
[http://www.shop263.com/doi-48/46.htm 水喷射真空泵]
[http://www.shop263.com/doi-48/47.htm 水喷射真空泵机组]
[http://www.shop263.com/doi-48/48.htm 水喷射真空机]
[http://www.shop263.com/doi-48/49.htm 水平式全自动包装机]
[http://www.shop263.com/doi-48/50.htm 水平叶片过滤机]
[http://www.shop263.com/doi-48/51.htm 水平纸板精滤机]
[http://www.shop263.com/doi-48/52.htm 水针剂]
[http://www.shop263.com/doi-48/53.htm 水转印机]
[http://www.shop263.com/doi-48/54.htm 丝网填料]
[http://www.shop263.com/doi-48/55.htm 四氟衬里容器]
[http://www.shop263.com/doi-48/56.htm 四氟过滤设备]
[http://www.shop263.com/doi-48/57.htm 四色高速铜版]
[http://www.shop263.com/doi-48/58.htm 松香蒸馏生设备]
[http://www.shop263.com/doi-48/59.htm 塑胶粉碎机]
[http://www.shop263.com/doi-48/60.htm 塑胶熔接机]
[http://www.shop263.com/doi-48/61.htm 塑料编织袋]
[http://www.shop263.com/doi-48/62.htm 塑料薄膜]
[http://www.shop263.com/doi-48/63.htm 塑料衬里蝶阀]
[http://www.shop263.com/doi-48/64.htm 塑料纺织袋]
[http://www.shop263.com/doi-48/65.htm 塑料废气处理]
[http://www.shop263.com/doi-48/66.htm 塑料复合贮罐]
[http://www.shop263.com/doi-48/67.htm 塑料混全机]
[http://www.shop263.com/doi-48/68.htm 塑料机械]
[http://www.shop263.com/doi-48/69.htm 塑料挤出造粒机]
[http://www.shop263.com/doi-48/70.htm 塑料离心泵]
[http://www.shop263.com/doi-48/71.htm 塑料片材机组]
[http://www.shop263.com/doi-48/72.htm 塑料软包装成套]
[http://www.shop263.com/doi-48/73.htm 塑料卧式真空计量槽]
[http://www.shop263.com/doi-48/74.htm 塑料液下泵]
[http://www.shop263.com/doi-48/75.htm 塑料制品]
[http://www.shop263.com/doi-48/76.htm 塑料注射成型机]
[http://www.shop263.com/doi-48/77.htm 塑瓶自动灌装封盖机]
[http://www.shop263.com/doi-48/78.htm 塔节]
[http://www.shop263.com/doi-48/79.htm 塔内件]
[http://www.shop263.com/doi-48/80.htm 台式高速离心机]
[http://www.shop263.com/doi-48/81.htm 太阳能热水器]
[http://www.shop263.com/doi-48/82.htm 钛材]
[http://www.shop263.com/doi-48/83.htm 钛金建材]
[http://www.shop263.com/doi-48/84.htm 钛金装饰工程]
[http://www.shop263.com/doi-48/85.htm 碳钢电加热]
[http://www.shop263.com/doi-48/86.htm 碳化硅环]
[http://www.shop263.com/doi-48/87.htm 碳化钨环]
[http://www.shop263.com/doi-48/88.htm 碳石墨环]
[http://www.shop263.com/doi-48/89.htm 碳素纤维]
[http://www.shop263.com/doi-48/90.htm 碳酸氢铵]
[http://www.shop263.com/doi-48/91.htm 碳脱氧装置]
[http://www.shop263.com/doi-48/92.htm 搪玻璃]
[http://www.shop263.com/doi-48/93.htm 搪玻璃反应罐]
[http://www.shop263.com/doi-48/94.htm 搪玻璃蜂窝板式换热器]
[http://www.shop263.com/doi-48/95.htm 搪玻璃管道]
[http://www.shop263.com/doi-48/96.htm 搪玻璃换热器]
[http://www.shop263.com/doi-48/97.htm 搪玻璃搅拌器]
[http://www.shop263.com/doi-48/98.htm 搪玻璃设备]
[http://www.shop263.com/doi-48/99.htm 搪玻璃蒸馏罐]
[http://www.shop263.com/doi-48/100.htm 搪玻璃贮罐]
[http://www.shop263.com/doi-48/101.htm 陶瓷地墙砖]
[http://www.shop263.com/doi-48/102.htm 陶瓷阀门]
[http://www.shop263.com/doi-48/103.htm 陶瓷过滤网]
[http://www.shop263.com/doi-48/104.htm 陶瓷纤维密封材料]
[http://www.shop263.com/doi-48/105.htm 陶塑复合泵]
[http://www.shop263.com/doi-48/106.htm 特福龙胶带]
[http://www.shop263.com/doi-48/107.htm 特殊工况泵]
[http://www.shop263.com/doi-48/108.htm 特种粉碎机]
[http://www.shop263.com/doi-48/109.htm 体外冲击波碎石机]
[http://www.shop263.com/doi-48/110.htm 填料塔]
[http://www.shop263.com/doi-48/111.htm 贴体包装机]
[http://www.shop263.com/doi-48/112.htm 铁箍牛皮卡纸圆桶成套设备]
[http://www.shop263.com/doi-48/113.htm 铁路罐车]
[http://www.shop263.com/doi-48/114.htm 铁氧体磁铁]
[http://www.shop263.com/doi-48/115.htm 通风干燥机]
[http://www.shop263.com/doi-48/116.htm 通风降温]
[http://www.shop263.com/doi-48/117.htm 通氯管]
[http://www.shop263.com/doi-48/118.htm 通讯]
[http://www.shop263.com/doi-48/119.htm 通用橡套软电缆]
[http://www.shop263.com/doi-48/120.htm 铜棒]
[http://www.shop263.com/doi-48/121.htm 铜网]
[http://www.shop263.com/doi-48/122.htm 筒式过滤器]
[http://www.shop263.com/doi-48/123.htm 筒式压滤机]
[http://www.shop263.com/doi-48/124.htm 头套组件]
[http://www.shop263.com/doi-48/125.htm 涂料]
[http://www.shop263.com/doi-48/126.htm 涂料成套设备]
[http://www.shop263.com/doi-48/127.htm 涂料机械]
[http://www.shop263.com/doi-48/128.htm 涂料设备]
[http://www.shop263.com/doi-48/129.htm 涂料生产用成套设备]
[http://www.shop263.com/doi-48/130.htm 涂料生产用单套设备]
[http://www.shop263.com/doi-48/131.htm 涂型软管]
[http://www.shop263.com/doi-48/132.htm 土工格室]
[http://www.shop263.com/doi-48/133.htm 土工网]
[http://www.shop263.com/doi-48/134.htm 推料离心机]
[http://www.shop263.com/doi-48/135.htm 托盘薄膜缠绕包装机]
[http://www.shop263.com/doi-48/136.htm 脱硫系统]
[http://www.shop263.com/doi-48/137.htm 脱水装置]
[http://www.shop263.com/doi-48/138.htm 外盘管式反应釜]
[http://www.shop263.com/doi-48/139.htm 外润滑不锈钢齿轮泵]
[http://www.shop263.com/doi-48/140.htm 万能胶专用设备]
[http://www.shop263.com/doi-48/141.htm 万向轴]
[http://www.shop263.com/doi-48/142.htm 网络宽带]
[http://www.shop263.com/doi-48/143.htm 网片]
[http://www.shop263.com/doi-48/144.htm 往复真空泵]
[http://www.shop263.com/doi-48/145.htm 微电机绝缘滴浸机]
[http://www.shop263.com/doi-48/146.htm 微粉碎机]
[http://www.shop263.com/doi-48/147.htm 微孔滤膜]
[http://www.shop263.com/doi-48/148.htm 微孔膜过滤器]
[http://www.shop263.com/doi-48/149.htm 微孔膜筒式过滤器]
[http://www.shop263.com/doi-48/150.htm 微量台式加热仪]
[http://www.shop263.com/doi-48/151.htm 微型阀门]
[http://www.shop263.com/doi-48/152.htm 微型小电机]
[http://www.shop263.com/doi-48/153.htm 维纶]
[http://www.shop263.com/doi-48/154.htm 维纶滤布]
[http://www.shop263.com/doi-48/155.htm 卫生阀门]
[http://www.shop263.com/doi-48/156.htm 卫生管件]
[http://www.shop263.com/doi-48/157.htm 卫生级提取浓缩设备]
[http://www.shop263.com/doi-48/158.htm 味精]
[http://www.shop263.com/doi-48/159.htm 涡轮粉碎机]
[http://www.shop263.com/doi-48/160.htm 涡旋式空气压缩机]
[http://www.shop263.com/doi-48/161.htm 蜗轮减速机]
[http://www.shop263.com/doi-48/162.htm 蜗轮式粉碎机组]
[http://www.shop263.com/doi-48/163.htm 卧式保温蒸馏水储罐]
[http://www.shop263.com/doi-48/164.htm 卧式刮刀虹吸卸料离心机]
[http://www.shop263.com/doi-48/165.htm 卧式过滤机]
[http://www.shop263.com/doi-48/166.htm 卧式离心卸料离心机]
[http://www.shop263.com/doi-48/167.htm 卧式螺旋沉降式离心机]
[http://www.shop263.com/doi-48/168.htm 卧式密闭砂磨机]
[http://www.shop263.com/doi-48/169.htm 卧式砂磨机]
[http://www.shop263.com/doi-48/170.htm 卧式锥形研磨机]
[http://www.shop263.com/doi-48/171.htm 乌洛托品]
[http://www.shop263.com/doi-48/172.htm 污水泵]
[http://www.shop263.com/doi-48/173.htm 污水处理]
[http://www.shop263.com/doi-48/174.htm 污水物潜水电泵]
[http://www.shop263.com/doi-48/175.htm 无机阻燃材料]
[http://www.shop263.com/doi-48/176.htm 无基础抗震式]
[http://www.shop263.com/doi-48/177.htm 无极变速搅拌分散机]
[http://www.shop263.com/doi-48/178.htm 无接口环形带]
[http://www.shop263.com/doi-48/179.htm 无泄漏酸碱泵]
[http://www.shop263.com/doi-48/180.htm 无油分子泵]
[http://www.shop263.com/doi-48/181.htm 无油罗茨泵]
[http://www.shop263.com/doi-48/182.htm 无重力混合机]
[http://www.shop263.com/doi-48/183.htm 务类贮罐]
[http://www.shop263.com/doi-48/184.htm 物料焚化炉]
[http://www.shop263.com/doi-48/185.htm 吸收器]
[http://www.shop263.com/doi-48/186.htm 吸收塔]
[http://www.shop263.com/doi-48/187.htm 吸塑包装热封机]
[http://www.shop263.com/doi-48/188.htm 吸塑成型机]
[http://www.shop263.com/doi-48/189.htm 吸塑机]
[http://www.shop263.com/doi-48/190.htm 吸塑罩折边机]
[http://www.shop263.com/doi-48/191.htm 稀配罐]
[http://www.shop263.com/doi-48/192.htm 锡槽气氛导流糸统]
[http://www.shop263.com/doi-48/193.htm 锡槽诱导式扒渣机]
[http://www.shop263.com/doi-48/194.htm 细胞生物学产品]
[http://www.shop263.com/doi-48/195.htm 细度分级机]
[http://www.shop263.com/doi-48/196.htm 下卸料沉降离心机]
[http://www.shop263.com/doi-48/197.htm 下卸料离心机]
[http://www.shop263.com/doi-48/198.htm 线切割电极铜丝]
[http://www.shop263.com/doi-48/199.htm 厢式隔膜压滤机]
[http://www.shop263.com/doi-48/200.htm 厢式压滤机]
[http://www.shop263.com/doi-48/201.htm 箱式真空镀膜机]
[http://www.shop263.com/doi-48/202.htm 橡胶机械]
[http://www.shop263.com/doi-48/203.htm 橡胶减震接头]
[http://www.shop263.com/doi-48/204.htm 橡胶件]
[http://www.shop263.com/doi-48/205.htm 橡胶射出机]
[http://www.shop263.com/doi-48/206.htm 橡胶制品]
[http://www.shop263.com/doi-48/207.htm 橡筋机]
[http://www.shop263.com/doi-48/208.htm 橡塑发泡机]
[http://www.shop263.com/doi-48/209.htm 削匀机]
[http://www.shop263.com/doi-48/210.htm 消防成套智能控制给水设备]
[http://www.shop263.com/doi-48/211.htm 斜板式锁气器]
[http://www.shop263.com/doi-48/212.htm 斜齿轮]
[http://www.shop263.com/doi-48/213.htm 斜齿轮减速机]
[http://www.shop263.com/doi-48/214.htm 鞋用透明体浇注机]
[http://www.shop263.com/doi-48/215.htm 卸料过滤自动离心机]
[http://www.shop263.com/doi-48/216.htm 新型活性剂驱油剂体系]
[http://www.shop263.com/doi-48/217.htm 新型填料]
[http://www.shop263.com/doi-48/218.htm 行星摆线针轮减速机]
[http://www.shop263.com/doi-48/219.htm 悬臂双螺旋锥形混合机]
[http://www.shop263.com/doi-48/220.htm 悬臂液下泵]
[http://www.shop263.com/doi-48/221.htm 悬挂式冷却器]
[http://www.shop263.com/doi-48/222.htm 旋风除尘器]
[http://www.shop263.com/doi-48/223.htm 旋流动态煅烧炉]
[http://www.shop263.com/doi-48/224.htm 旋流闪蒸干燥机]
[http://www.shop263.com/doi-48/225.htm 旋片式真空泵]
[http://www.shop263.com/doi-48/226.htm 旋启式衬胶止回阀]
[http://www.shop263.com/doi-48/227.htm 旋塞阀]
[http://www.shop263.com/doi-48/228.htm 旋涡振荡筛]
[http://www.shop263.com/doi-48/229.htm 旋转薄膜蒸发器]
[http://www.shop263.com/doi-48/230.htm 旋转烘干机]
[http://www.shop263.com/doi-48/231.htm 旋转闪蒸干燥机]
[http://www.shop263.com/doi-48/232.htm 旋转式滗水器]
[http://www.shop263.com/doi-48/233.htm 旋转式空调压缩机]
[http://www.shop263.com/doi-48/234.htm 旋转舞台]
[http://www.shop263.com/doi-48/235.htm 选矿设备]
[http://www.shop263.com/doi-48/236.htm 压封机]
[http://www.shop263.com/doi-48/237.htm 压力喷雾造粒干燥机]
[http://www.shop263.com/doi-48/238.htm 压力容器]
[http://www.shop263.com/doi-48/239.htm 压滤机]
[http://www.shop263.com/doi-48/240.htm 压滤机带滤机离心机]
[http://www.shop263.com/doi-48/241.htm 压滤机专用泵]
[http://www.shop263.com/doi-48/242.htm 压片机]
[http://www.shop263.com/doi-48/243.htm 压榨式]
[http://www.shop263.com/doi-48/244.htm 亚克力纤维编织盘根]
[http://www.shop263.com/doi-48/245.htm 掩膜对准曝光机]
[http://www.shop263.com/doi-48/246.htm 药物熏蒸]
[http://www.shop263.com/doi-48/247.htm 药用途真空系统]
[http://www.shop263.com/doi-48/248.htm 叶轮式增氧机]
[http://www.shop263.com/doi-48/249.htm 液氨]
[http://www.shop263.com/doi-48/250.htm 液动卸槽潜油泵]
[http://www.shop263.com/doi-48/251.htm 液固分离机械]
[http://www.shop263.com/doi-48/252.htm 液化氯化氢]
[http://www.shop263.com/doi-48/253.htm 液化石油气瓶阀]
[http://www.shop263.com/doi-48/254.htm 液氯]
[http://www.shop263.com/doi-48/255.htm 液面履盖球]
[http://www.shop263.com/doi-48/256.htm 液体真空包装机]
[http://www.shop263.com/doi-48/257.htm 液下泵]
[http://www.shop263.com/doi-48/258.htm 液压出料灌装机]
[http://www.shop263.com/doi-48/259.htm 液压塑料气压热成型机]
[http://www.shop263.com/doi-48/260.htm 液压花砖机]
[http://www.shop263.com/doi-48/261.htm 液压机]
[http://www.shop263.com/doi-48/262.htm 液压挤水机]
[http://www.shop263.com/doi-48/263.htm 液压胶管总成]
[http://www.shop263.com/doi-48/264.htm 液压润滑设备]
[http://www.shop263.com/doi-48/265.htm 液压式双缸热熔釜]
[http://www.shop263.com/doi-48/266.htm 一二类压力容器]
[http://www.shop263.com/doi-48/267.htm 医药化工机械]
[http://www.shop263.com/doi-48/268.htm 医用电脑传呼对讲系统]
[http://www.shop263.com/doi-48/269.htm 医用氧舱]
[http://www.shop263.com/doi-48/270.htm 仪表]
[http://www.shop263.com/doi-48/271.htm 乙二醇]
[http://www.shop263.com/doi-48/272.htm 乙炔]
[http://www.shop263.com/doi-48/273.htm 饮用设备微型增压泵]
[http://www.shop263.com/doi-48/274.htm 异形喷丝板组件]
[http://www.shop263.com/doi-48/275.htm 荧光基因分析仪]
[http://www.shop263.com/doi-48/276.htm 硬脂酸]
[http://www.shop263.com/doi-48/277.htm 硬质合金]
[http://www.shop263.com/doi-48/278.htm 油泵]
[http://www.shop263.com/doi-48/279.htm 油环真空泵]
[http://www.shop263.com/doi-48/280.htm 油浸式电动滚筒]
[http://www.shop263.com/doi-48/281.htm 油膜轴承]
[http://www.shop263.com/doi-48/282.htm 油墨]
[http://www.shop263.com/doi-48/283.htm 油品装卸用气]
[http://www.shop263.com/doi-48/284.htm 油漆]
[http://www.shop263.com/doi-48/285.htm 油气分离器]
[http://www.shop263.com/doi-48/286.htm 油酸酰胺]
[http://www.shop263.com/doi-48/287.htm 油田特种车配件]
[http://www.shop263.com/doi-48/288.htm 油压机]
[http://www.shop263.com/doi-48/289.htm 油烟过滤网]
[http://www.shop263.com/doi-48/290.htm 油脂]
[http://www.shop263.com/doi-48/291.htm 油脂工程成套设备]
[http://www.shop263.com/doi-48/292.htm 有机硅材料]
[http://www.shop263.com/doi-48/293.htm 有机热载体炉]
[http://www.shop263.com/doi-48/294.htm 有机载体炉]
[http://www.shop263.com/doi-48/295.htm 渔箱]
[http://www.shop263.com/doi-48/296.htm 柱塞泵]
[http://www.shop263.com/doi-48/297.htm 铸造型呋喃]
[http://www.shop263.com/doi-48/298.htm 转盘式鞋机]
[http://www.shop263.com/doi-48/299.htm 锥式锁气器]
[http://www.shop263.com/doi-48/300.htm 自动称量充填]
[http://www.shop263.com/doi-48/301.htm 自动高速封切制袋机]
[http://www.shop263.com/doi-48/302.htm 自动焊管机]
[http://www.shop263.com/doi-48/303.htm 自动焊小车]
[http://www.shop263.com/doi-48/304.htm 自动化系统设备]
[http://www.shop263.com/doi-48/305.htm 自动挤压机]
[http://www.shop263.com/doi-48/306.htm 自动连续藻土精滤机]
[http://www.shop263.com/doi-48/307.htm 自动抛光机]
[http://www.shop263.com/doi-48/308.htm 自动泡罩包装机]
[http://www.shop263.com/doi-48/309.htm 自动收口机]
[http://www.shop263.com/doi-48/310.htm 自动喂罐充填]
[http://www.shop263.com/doi-48/311.htm 自动厢式隔膜压滤机]
[http://www.shop263.com/doi-48/312.htm 自动压滤机]
[http://www.shop263.com/doi-48/313.htm 自动重粉剂灌装设备]
[http://www.shop263.com/doi-48/314.htm 转盘式塑胶鞋类注射成型机]
[http://www.shop263.com/doi-48/315.htm 自击式破碎机]
[http://www.shop263.com/doi-48/316.htm 自控自吸泵]
[http://www.shop263.com/doi-48/317.htm 自吸泵]
[http://www.shop263.com/doi-48/318.htm 自吸滑片泵]
[http://www.shop263.com/doi-48/319.htm 自吸喷射]
[http://www.shop263.com/doi-48/320.htm 自吸式无堵塞排污泵]
[http://www.shop263.com/doi-48/321.htm 自吸增压泵]
[http://www.shop263.com/doi-48/322.htm 阻火器]
[http://www.shop263.com/doi-48/323.htm 左旋异丙醇胺]
[http://www.shop263.com/doi-48/324.htm 贮存设备]
[http://www.shop263.com/doi-48/325.htm 贮罐]
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http://www.shop263.com/doi-48/325.htm

Revision as of 17:01, 28 October 2004

Motivation

All the Xiph.org codecs have some internal mechanism for including metadata about the current stream. Generally, this is one of the codec headers, and in the words of the vorbis spec, "It is meant for short, text comments...much like someone jotting a quick note on the bottom of a CDR."

This works well enough for most things, and can be overloaded/abused (depending on your point of view) for most other things. But there are three major requirements that point to the design of an external metadata format; one that can be interleaved with the other streams in a container.

  • Machinability There are a number of items of metadata that a player will want to parse and take action on. While there are usually 'convention' schemes for doing this with the embedded comment headers, this is much easier if there is a separate metadata stream designed for such use, instead of having to do best-effort parsing of natural language comments. For example, a video file with multiple audio tracks can specify the language of each one; a player than can parse these reliably can match them against a language preference list configured by the user to automatically select and begin playback of the best option.
  • Kitchen Sink There are a minority of people who care passionately about having every detail about a track available. In the sense of conserving such information, and providing an equivalent to liner notes for online distribution, this is a goal worth supporting. However, the simple unstructured key-value pairs offered by the inline metadata are unwieldy for this level of detail. How do you tell the 2nd unit Assistant Director from the USA unit Assistant Director? How do you indicate which artist played tenor sax in the solo?
  • Addressability The internal comment metadata headers are by necessity attached to a single content stream. This is useful for some appication, but a limitation in others. In a multiplexed stream, which set of comments refers to the collection as a whole? (By convention, in Ogg, it's the first logical bitstream occuring, but we can do better.) A separate metadata stream type must address this issue of collective metadata while still allowing description of individual streams. It should also allow temporal addressability, so that changes can be described. Because the in-stream comment metadata are part of the codec headers, it cannot change over the course of the stream, and allowing additional comment packets elsewhere in the stream presents seeking challenges. In the Ogg container this can be resolved by inserting a chain boundary, but this is a poor option for very-low-bitrate streams and unreliable transports such as RTP.

Proposed Solutions

RDF + dublin core

XML-encoding (generic rdf or CMML?)

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