Extending a class with predefined values for properties

[qomhmd]

I have a class Concept defined as:

CREATE CLASS Concept EXTENDS V;
CREATE PROPERTY Concept.name STRING;
CREATE PROPERTY Concept.type LINK Concept; -- to be used in inherited classes
CREATE PROPERTY Concept.value LINK Concept; -- to be used in inherited classes
CREATE PROPERTY Concept.loinc STRING;
CREATE PROPERTY Concept.sctid STRING;
CREATE PROPERTY Concept.alias EMBEDDEDLIST STRING;
CREATE INDEX Concept.type_name_value ON Concept (type, name, value) UNIQUE;

I want to create a class named Sex which extends Concept with a predefined value for type linked to a vertex of type Concept and name = sex.