plays statement
The statement <LABEL> plays <SCOPED ROLE LABEL> is used to identify the <LABEL> type as a roleplayer of <SCOPED ROLE LABEL>.
Defining roleplayers
The plays keyword can be used to define a type as a roleplayer of a role type.
Note that a scope is required to resolve role type names ambiguity.
define user plays parentship:parent;Undefining roleplayers
The plays keyword can be used to undefine a type’s role.
undefine plays parentship:parent from user;Matching
Matching played role types
The plays keyword can be used to match all role types a type plays.
match user plays $r;Matching roleplayer types
The plays keyword can be used to match all roleplayer types for a role type with a label <LABEL>.
match $rp plays parent;Note that a scope can be used to have more specific results.
The previous query can return results for different role types with the same <LABEL>, while the following example returns only relation types with the specified scope.
match $rp plays parentship:parent;