{
    login = {
        class = EOFetchSpecification; 
        entityName = User; 
        fetchLimit = 0; 
        isDeep = YES; 
        qualifier = {
            class = EOAndQualifier; 
            qualifiers = (
                {
                    class = EOKeyValueQualifier; 
                    key = username; 
                    selectorName = "isEqualTo:"; 
                    value = {"_key" = user; class = EOQualifierVariable; }; 
                }, 
                {
                    class = EOKeyValueQualifier; 
                    key = password; 
                    selectorName = "isEqualTo:"; 
                    value = {"_key" = password; class = EOQualifierVariable; }; 
                }
            ); 
        }; 
    }; 
}