owns statement

The statement <LABEL> owns <ATTRIBUTE LABEL> is used to identify the <LABEL> type as an owner of <ATTRIBUTE LABEL>.

Schema for the following examples 
#!test[schema, commit]
define
entity user;
attribute email value string;

Defining ownership

The owns keyword can be used to define a type as an owner of an attribute type.

#!test[schema]
define user owns email;

Undefining ownership

The owns keyword can be used to undefine a type’s ownership of an attribute type.

#!test[schema]
undefine owns email from user;

Matching

Matching owned attribute types

The owns keyword can be used to match all attribute types a type owns.

#!test[read]
match user owns $a;

Matching owner types

The owns keyword can be used to match all owner types for an attribute type.

#!test[read]
match $o owns email;