Property:Allows value
Testing Electric Safety in Low Voltage Distribution Systems up to 1kV AC / 1.5kV DC
"Allows value" is a predefined property that can define a list of permissible values to restrict value assignments for a property and is provided by Semantic MediaWiki. This property is pre-deployed (also known as special property) and comes with additional administrative privileges but can be used just like any other user-defined property.
