has statement
The statement <OWNER VAR> has <ATTRIBUTE VAR> is used to identify the <OWNER VAR> as owning the <ATTRIBUTE VAR>.
Inserting attribute ownership
The has keyword can be used to attach an attribute to an object.
insert $person has $name;An attribute can be created in-place by providing its type and value.
insert $person has name "Alice";Deleting attribute ownership
The has keyword is used to remove an attribute from its owner.
delete has $name of $person;Matching attributes
The has keyword can be used to match attributes of an object.
match $person has $name;The attribute type may be provided.
match $person has name $name;The attribute can be matched by attribute type and value instead of binding it to a variable.
match $person has name "Alice";Alternatively, a comparison can be used to constrain the attribute value.
match $person has name < "Bob";