The main concept in WSRM is that of a Sequence.
WSRM中最重要的概念是序列（Sequence）。
The guarantee that WSRM - by itself - offers, is simply that the message was successfully transferred from the RMS to the RMD and that the RMD acknowledged it.
WSRM自身提供的可靠性保证，其实就是要求消息能从RMS到RMD成功传输，且RMD予以确认。
More and more companies are developing and using Web services and XML communications internally, and as those links become "line-of-business" WSRM will become a key technology to ensure reliability.
越来越多的公司开发并使用基于Web服务和XML的通讯工具，而WSRM恰是在其中保证可靠性的关键技术。
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