用于WebGIS的网络地图服务发布，功能交互的开源包(Web mapping is the process of designing, implementing, generating, and delivering maps
on the World Wide Web and its products. OpenLayers is a powerful, community driven,
open source, pure Javascr ipt web-mapping library. With it, you can easily create your
own web map mashup using WMS, Google Maps, and a myriad of other map backends.
Interested in knowing more about OpenLayers? This book is going to help you learn
OpenLayers from scratch.)