As an international network data exchange standard, XML has a wide application foreground and powerful functions in the connection and exchange of homogeneous or heterogeneous data.

XML作为网络数据交换的标准，在同种数据或异种数据的互连和交换中，有着广泛的应用前景和强大的功能。

youdao

It is a packet-switched technology, and only consumes network resources when data is being transmitted, so it is widely expected that customers will be charged for the amount of data they exchange, rather than the time they spend logged on to the network.

CNN: AOL brings instant messenger to mobile phones