As for specialty directories, the system works the same as in compiling a general directory. Editors review submissions and also actively seek out new sites, which they then categorize. The difference is that the specialty directory may list more Web sites for the area it specializes in than a general directory will. It may also have many more subcategories. Getting Regional Enough generalities.
Lets talk about some specific types of specialty services.
A good place to start is with regional services, the search engines and directories that focus on particular countries or regions of the world. Regional guides are created both through custom crawling or human power, as described above. Additionally, the creators use domain filtering and language detection, as described below. Filtering By Domain Domain filtering is an easy way of turning a general Web index into a country-specific one. It takes advantage of the fact that every country has its own top-level domain.