架构：关键资源已确定；它们可能是实体、集合或者其他似乎值得拥有自己的URI的对象。
Architecture: Key resources are identified; they can be entities, collections, or anything that seems worthy of having its own URI.
世界卫生组织认识到这些障碍，建议“在资源许可和已确定疾病负担的地方”使用Hib疫苗。
The World Health Organization (WHO), recognizing these obstacles, recommends Hib vaccine "where resources permit its use and the burden of disease is established".
我们可以使用它查看资源树中的更改，并根据已更改的资源类型确定所需的操作。
We can use this to walk through the changes in the resource tree and determine what actions need to be taken based on the type of resource that has changed.
应用推荐