Thegeneraldefinitionof the line of electric force and the universalpropertiesdrawnfrom the chart of the line of electric force conform toany types ofelectrostaticfield.
To date, the World Heritage List recognizes 878 properties of "outstanding universal value, " including 679 cultural, 174 natural and 25 mixed properties in 145 States Parties.
Signatories agree to adopt stringent national policies for the protection of their cultural and natural sites and to nominate properties of "outstanding universal significance" within their territories for inscription on the World Heritage List.