-- Invoked by C-ES to SNS, seeking the status of one or more M-ES's

statusQuery OPERATION
    ARGUMENT StatusQueryArgument
    RESULT StatusQueryResult
    ERRORS
    {
        accessControlViolated,
        securityError,
        insufficientResources,
        unwillingToPerform,
        genericError
    } ::= 1;

StatusQueryArgument ::= SEQUENCE
    {

        -- Security features
        security                [0]    IMPLICIT SecurityElement OPTIONAL,
        
        -- List of M-ES's whose status is being sought by the C-ES
        subjectNameOrAddress    [1]    SEQUENCE SIZE (0..ub-subjects)
                                         OF NameOrAddress

    };   

StatusQueryResult ::= SEQUENCE
    {
        -- Status information of one or more M-ES's
        subjectStatusInfo               SEQUENCE SIZE (0..ub-subjects)
                                                OF SubjectStatusInfo
    };

NameOrAddress ::= CHOICE
    {
    -- IP address of an End System
    ipAddress                   [0]     IMPLICIT OCTET STRING (SIZE (4)),
    
    -- Domain name of an End System
    domainName                  [1]     IMPLICIT PrintableString,
    
    -- NSAP address of an End System
    nsapAddress                 [2]     IMPLICIT NsapAddress,
    
    -- Distinguished name of an End System
    distinguishedName           [3]     IMPLICIT PrintableString,
    
    -- List of different IP addresses [e.g., machines on a network]
    ipRange                     [4]     IMPLICIT IpRange
    };

IpAddress  ::= OCTET STRING (SIZE (4));

NsapAddress ::= OCTET STRING (SIZE (20));

IpRange ::= SEQUENCE
    {
     begin       [0]             IMPLICIT IpAddress,
     end         [1]             IMPLICIT IpAddress
    };


SubjectStatusInfo ::= SEQUENCE
    {
    -- M-ES name or address
        subjectNameOrAddress    NameOrAddress,

    -- M-ES Status information reported date and time
        reportGenerated         DateTime,
 
    -- Current status of M-ES
        currentStatus           Status,

    -- Last date and time for which the M-ES status was known
        lastSeen                DateTime OPTIONAL,

    -- Last M-ES status at last date and time
        lastStatus              Status OPTIONAL
    };


-- M-ES status: either active, inactive or invalid
Status ::= ENUMERATED
    {
    active                                      (0),
    inactive                                    (1),
    invalid                                     (2),
    -- Circuit Switched specific Status
    cs-active			                                  (3),
    cs-inactive                                 (4),
    cs-unknown                                  (5)                                 
    };