Property:From
The property from defines a Point φfrom which defines the beginning of something. This Point can represent any Object, like a City, Property:Time, Property:Length, Property:Power, and Property:Acceleration.
[edit] Definition
With the current Semantic MediaWiki implementation, this Type can't used directly, because we need typed Types to handle its values in the Database. So we need to derive from this property.
As Example you want to define the beginning of Time. Therefore you need a new Property:since or Property:from time. To define a city you define Property:from city. Then you derive them from this Property and define their Type (Time, String, etc.).
[edit] Use
The use of this Property is very useful to define two-dimensional-Vectors (Spans) of any type in combination with Property:to. This could look like the following in the Article Bill Clinton:
[[{from date:=20/1/1993}{to date:=20/1/2001}{was president of::USA}]]
