In English law, a fee simple or fee simple absolute is an estate in land, a form of freehold ownership. A "fee" is a vested, inheritable, present possessory interest in land. A "fee simple" refers to a sub-category of such interests that features an absence of any temporal condition limiting its durational period under common law, whereas the highest possible form of ownership interest that can be held in real property is a "fee simple absolute," which is a sub-set characterized by an absence of limitations regarding the land's use. Allodial title is reserved to governments under a civil law structure. The rights of the fee-simple owner are limited by government powers of taxation, compulsory purchase, police power, and escheat, and may also be limited further by certain encumbrances or conditions in the deed, such as, for example, a condition that required the land to be used as a public park, with a reversion interest in the grantor if the condition fails; this is a fee simple conditional.