The digital computer protction ' s reliability , sensitivity and instancy mainly depend on the digital filter and protection algorithm 微机保护的安全、可靠、灵敏、快速，关键取决于数字滤波和保护算法。
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Both of the protection use high frequency distance or directional protection as main protection , and use distance protection adding current protection as reserving protection . this dispositon assured relay protection ' s four features : election , sensitivity , instancy and reliability 每套保护大多以高频距离、高频方向保护作为快速切除区内故障的主保护，而以距离保护和零序保护作为后备保护，保证了继电保护的选择性、灵敏性、快速性、可靠性。
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As it ' s proprietary , a large numbers of bibliography resource ca n ' t be provided to common readers of internet . along with the development of network technology , it has a instancy need to conversion marc format to the information that the browser can recognize . the language xml not only can expresses the metadata , but also can show the content of data . lt can provide individuation page layout Marc格式是目前图书馆馆藏资源的主要表示格式，由于其专用性，使得目前大量的书目资源无法通过一般的搜索引擎向internet用户提供，随着网络技术的不断发展，迫切需要将marc格式的数据转换成常用浏览器所能识别的信息，为大众提供服务，可扩展标记语言xml不仅可以表达元数据，而且可以揭示数据的内容，提供个性化的页面显示，用xml语言对marc数据进行描述是解决这一问题的有效途径，文章提供了marc数据的xml表示方法和实现途径。
