From Edge of Darkness Wiki
The datatype string is used for simple words and similar character sequences. It has the following restrictions:
- As for all properties, the sequence "::" is not possible in property values (not even inside nowiki tags).
- values must not be longer than 255 characters (if you use non-latin characters, this number might be smaller). If you need longer strings, use Type:Text.
You can use some wiki markup inside a string property such as runs of ' for bold and italic, and the markup will change the appearance of the string. You cannot embed semantic annotations inside a string property.
You can use the special property Allows value to restrict a property to a particular set of values. For example you could limit "Status" to certain states.
The old Type:Enumeration from SMW versions prior to 1.0 is an alias for Type:String since it has the same behaviour.
This type is among the standard datatypes of this wiki.