XML 是用于描述结构数据的一种标记语言，已经成为存储数据、在应用程序和公司之间交换数据的常用格式。
XML is a markup language designed to describe structured data. It is becoming a common way to both store data and exchange it between applications and companies.
MPLS网络不可避免地存在着形成标记交换路径（LSP）环路的可能，而ATM技术特点又使MPLS网络环路控制机制的应用受到一些限制。
There is an inevitable possibility of an LSP forming loops in MPLS networks, and the application of MPLS's loop control mechanisms is restricted by the ATM technological traits.
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