Assertion: scope | /r/HasProperty | a subset of lifetime
Facets:
value: for entities such as variables
type: OTHER
Source sentences:
text: For entities such as variables, scope is a subset of lifetime (also known as extent)—a name can only refer to a variable that exists (possibly with undefined value), but variables that exist are not necessarily visible: a variable may exist but be inaccessible (the value is stored but not referred to within a given context), or accessible but not via the given name, in which case it is out of context (the program is "out of the scope of the name").