You can read about them here... If youve got specific questions about the reading please ask. There are some really good articles in the "Understanding" section on the left side of that page.
AMCE Company has a web service, it decides to offer its customers the
current sales tax rate for their state. subscribers (other companies) can
have their shopping-cart go to the web service look-up the tax rate by
passing a parameter such as state and the web-service would return the
current tax rate for that state.
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