Rate

Rate defines a single rate inside a category

Schema ID

https://gobl.org/draft-0/tax/regime#/$defs/Rate

Title	Property	Type	Req.	Description
Key	`key`	cbc.Key	true	Key identifies this rate within the system
Name	`name`	i18n.String	true	Human name of the rate
Description	`desc`	i18n.String		Useful description of the rate.
Exempt	`exempt`	boolean		Exempt when true implies that the rate when used in a tax Combo should not define a percent value.
Values	`values`	array of tax.RateValue		Values contains a list of Value objects that contain the current and historical percentage values for the rate and additional filters. Order is important, newer values should come before older values.
Extensions	`extensions`	array of cbc.Key		Extensions defines a list of keys for codes that can or must be associated with the tax rate for it to be validated. Every key must be defined in the Regime’s extensions.
Map	`map`	cbc.CodeMap		Map is used to associate specific codes with the chosen rate.
Meta	`meta`	cbc.Meta		Meta contains additional information about the rate that is relevant for local frequently used implementations.